is_object not returning expected result php - php

I'm working on a script where I can check permissions and stuff, and I stumbled across something odd.
My permission script can check systems and functions and see if the user is allowed to use m.
I'll explain with some code:
if(permission::check('factbounce', 'magklik')){
echo ' Yep good ';
} else {
echo 'Nope not good';
}
Here I have a system factbounce and a function magklik, now inside the permission class:
public static function check($systemCode, $functionCode = null ){
$instance = self::get();
if($instance->checkSystem($systemCode)){
if(is_null($functionCode))
return true;
if(!$instance->checkSystemFunction($functionCode))
return false;
return true;
}
return false;
}
This piece of code of will trigger checkSystemFunction, and will check on magklik:
private function checkSystemFunction ( $functionCode ){
if(!self::$oSystemFunction)
self::$oSystemFunction = org_system_function::getByCode($functionCode);
if(!is_object(self::$oSystemFunction));
echo 'No Object';
echo '<pre>'.print_r(self::$oSystemFunction, true).'</pre>';
if(!self::$oSystemPermission->checkFunctionPermission(self::$oMedewerker, self::$oSystemFunction))
return false;
return true;
}
The output of the code is this:
No Object
org_system_function Object
(
[primaryKey] => org_system_function_id
[table] => org_system_function
[arAssoc] => Array
(
[function_id] => 1
[name] => May click around
[code] => magklik
[description] => do what you want
)
)
Yep good
I don't understand why it says no object, clearly when I print it it's an object.

You are terminating your if clause with the trailing ;:
if (!is_object(self::$oSystemFunction));
echo 'No Object';
So echo 'No Object' will always get executed.

You're terminating your if statement with a semicolon. So, the echo statement is being processed normally and will get executed every time you run the script.
This should work:
if(!is_object(self::$oSystemFunction))
echo 'No Object';
But it's always a good idea to separate your if else blocks with curly braces.
if(!is_object(self::$oSystemFunction)) {
echo 'No Object';
}
This increases the readabaility and maintainability of your code.
An example to demonstrate this:
$a = 1;
$b = 2;
if ($a == $b);
echo 'foo';
The above code outputs:
foo
See the demo here.

Related

How can I convert an array into a php statement?

I have an array like this...
[Summary] => Array
(
[0] => yearManufactured
[1] => &&
[2] => make
[3] => ||
[4] => model
)
how can I convert this array into function calls and operators and then use it to make a comparision, for example turn it into this...
if( $this->yearManufactured() && $this->make() || $this->model() ) {
// do something
} else {
// do something else
}
Methods in class..
public function yearManufactured() {
return true;
}
public function make() {
return false;
}
public function model() {
return true;
}
This seems like something that could actually be a valid use for eval. You can verify that each array item is either an operator or a valid method name, and convert the result of the method call to a boolean string. Putting those things together should result in a string that you can safely eval without worrying about it doing something nasty, other than maybe causing a parse error, which can be caught in PHP 7.
If you find anything in the array that isn't supposed to be there, or the expression doesn't parse, you can return null, or throw an exception, however you want to handle it.
public function evaluateExpressionArray(array $expression) {
// build the expression
$expr = '$result =';
foreach ($expression as $part) {
if ($part == '||' || $part == '&&') {
$expr .= " $part ";
} elseif (method_exists($this, $part)) {
$expr .= $this->$part() ? 'true' : 'false';
} else {
return null;
}
}
// try to evaluate it
try {
eval("$expr;");
} catch (ParseError $e) {
return null;
}
return $result;
}
Be very careful with eval, though. Don't ever put anything into it unless you know exactly what it is.
Here's an example to mess with.

PHP Classes and Objects construct and destruct

I´m trying to learn construct and destruct.
So, I made this
<?php
class Numbers {
public function __construct($numberint,$numbername,$numberletter,$numberpos) {
$this->numberint = $numberint;
$this->numbername = $numbername;
$this->numberletter = $numberletter;
$this->numberpos = $numberpos;
}
public function __destruct() {
unset($this->numberpos);
}
}
$number1 = new Numbers(1,"One","A",0);
print_r($number1);
?>
As you can see, I create the class Number and then, use construct for the Objects. But after construct, I want to use destruct, in this case, unset numberpos. I´m trying to put them together to understand how the work.
Anyone can help me?
My idea is to change the result:
Numbers Object ( [numberint] => 1 [numbername] => One [numberletter] => A [numberpos] => 0 )
To...
Numbers Object ( [numberint] => 1 [numbername] => One [numberletter] => A )
Thanks and remember that I´m learning :D
The destructor is there to destroy the whole object, not parts of an object. If you want your desired output, you could just do:
$number1 = new Numbers(1,"One","A",0);
print_r($number1);
unset($number1->numberpos);
print_r($number1);
Demo.
If you want to see your destructor getting called, unset the object:
class Numbers {
public function __destruct() {
echo "Destructing!\n";
}
}
$number1 = new Numbers();
unset($number1);
echo "Done!";
Outputs:
Destructing!
Done!

PHP array value isn't shown by var_dump but it was fetched.

I wrote some program to check the value in an array.
var_dump($profileuser);//NULL
$profileuser = get_user_to_edit($user_id);//fetch the value of $profileuser
var_dump($profileuser);//does not print the value of $profileuser->user_url
//nor by print_r($profileuser)
if(isset($profileuser->user_url))
echo $profileuser->user_url;//printed!!!!How is it possible??
Could somebody can explain how this happened?
background:
I modified the kernel of wordpress.
This happened when I modified the file of wp-admin/user-edit.php.
You say it's an array, but you're accessing it as an object ($obj->foo rather than $arr['foo']), so it's most likely an object (actually it is - get_user_to_edit returns a WP_User). It could easily contain the magic __get and __isset methods that would lead to this behaviour:
<?php
class User {
public $id = 'foo';
public function __get($var) {
if ($var === 'user_url') {
return 'I am right here!';
}
}
public function __isset($var) {
if ($var === 'user_url') {
return true;
}
return false;
}
}
$user = new User();
print_r($user);
/*
User Object
(
[id] => foo
)
*/
var_dump( isset($user->user_url) ); // bool(true)
var_dump( $user->user_url ); // string(16) "I am right here!"
DEMO
One possibility is that $profileuser is an Object that behaves as an array and not an array itself.
This is possible with interface ArrayAccess. In this case, isset() would return true and you might not see it when you do var_dump($profileuser);.
When you want an object to behave like an array, you need to implement some methods which tell your object what to do when people use it as if it were an array. In that case, you could even create an Object that, when accessed as an array, fetches some webservice and return the value. That may be why you are not seeing those values when you var_dump your variable.
I thinks it's not possible, I've created test code and var_dump behaves correctly. Are you 100% sure you don't have any typo in your code? I remind variables in PHP are case sensitive
<?php
$profileuser = null;
class User
{
public $user_url;
}
function get_user_to_edit($id) {
$x = new User();
$x->user_url = 'vcv';
return $x;
}
var_dump($profileuser);//NULL
$user_id = 10;
$profileuser = get_user_to_edit($user_id);//fetch the value of $profileuser
var_dump($profileuser);//does not print the value of $profileuser->user_url
//nor by print_r($profileuser)
if(isset($profileuser->user_url))
echo $profileuser->user_url;//printed!!!!How does it possible??
Result is:
null
object(User)[1]
public 'user_url' => string 'vcv' (length=3)
vcv

Breaking out of multiple functions (short circuiting) in PHP

I want to return multiple nested functions in PHP. It's possible to break out of multiple loops by adding a number after "break". Eg.
while(1)
while(1)
while(1)
break 3;
Can I do a circuit break while calling a sequence of functions?
Not that I know of, it's also not very healthy of a design, as the parent and grandparent functions in question will never know of the break. You should throw an exception and catch it on the parent, which in turn will throw an exception and catch it on the grandparent etc.
To "break" out of functions, you can use the return.
function somefunction()
{
return;
echo 'This will never get displayed';
}
Another solution would be to add a condition to each while.
while(1 && $isTrue)
while(1 && $isTrue)
while(1 && $isTrue)
$isTrue = false;
break;
Although I don't think this is a very clean approach.
As the manual states break is for loop only.
What I do in such cases is that have an exception return value(or object) and do value check on return value at every function return point to make sure that the situation is propagated or handled appropriately, be careful while doing recursions though, you might completely fold up the tree by mistake....btw if it is a simple exit on error kind of situation you can also use exceptions.
It's possible to return a special result from child functions that indicates a specific condition has been met. WordPress uses WP_Error and is_wp_error() for this sort of operation. Any number of nested functions can check to see if a called function returned an error state, and opt to pass that error up the chain rather than continue with processing.
Example:
function outer() {
$result = inner();
// pass failure back to parent
if( is_wp_error($result) ) {
return $result;
}
// other processing
return $final_result;
}
function inner() {
if( some_condition() ) {
// generate an error
return new WP_Error( 'code', 'message' );
}
return $other_result;
}
$result = outer();
// did we get an error?
if( is_wp_error($result) ) {
echo 'Something went wrong.';
} else {
echo $result;
}
Yes, you can very simply construct a "body-less" while() or if() block. Typically, you will see PSR-12 compliant PHP code using {} to bookend the body of the loop/condition block, but the body is not required. Writing a semicolon at the end of the line will be sufficient and your IDE will not complain about bad syntax.
Returning a truthy value from each function will be an adequate indicator that the following function is authorised for execution.
This will provide the "short circuit" functionality that is desired without creating nested control structures or passing variables into different scopes.
I'll demonstrate with a battery of generic functions:
function echo1T() {
echo "1";
return true;
}
function echo2T() {
echo "2";
return true;
}
function echo3T() {
echo "3";
return true;
}
function echo1F() {
echo "1";
return false;
}
function echo2F() {
echo "2";
return false;
}
function echo3F() {
echo "3";
return false;
}
Code: (Demo with more scenarios)
while (echo1T() && echo2F() && echo3T()); // outputs: 12
if (echo1T() && echo2F() && echo3T()); // outputs: 12
$return = echo1T() && echo2F() && echo3T(); // outputs: 12
var_export($return); // outputs false

How to get a variable name as a string in PHP?

Say i have this PHP code:
$FooBar = "a string";
i then need a function like this:
print_var_name($FooBar);
which prints:
FooBar
Any Ideas how to achieve this? Is this even possible in PHP?
I couldn't think of a way to do this efficiently either but I came up with this. It works, for the limited uses below.
shrug
<?php
function varName( $v ) {
$trace = debug_backtrace();
$vLine = file( __FILE__ );
$fLine = $vLine[ $trace[0]['line'] - 1 ];
preg_match( "#\\$(\w+)#", $fLine, $match );
print_r( $match );
}
$foo = "knight";
$bar = array( 1, 2, 3 );
$baz = 12345;
varName( $foo );
varName( $bar );
varName( $baz );
?>
// Returns
Array
(
[0] => $foo
[1] => foo
)
Array
(
[0] => $bar
[1] => bar
)
Array
(
[0] => $baz
[1] => baz
)
It works based on the line that called the function, where it finds the argument you passed in. I suppose it could be expanded to work with multiple arguments but, like others have said, if you could explain the situation better, another solution would probably work better.
You could use get_defined_vars() to find the name of a variable that has the same value as the one you're trying to find the name of. Obviously this will not always work, since different variables often have the same values, but it's the only way I can think of to do this.
Edit: get_defined_vars() doesn't seem to be working correctly, it returns 'var' because $var is used in the function itself. $GLOBALS seems to work so I've changed it to that.
function print_var_name($var) {
foreach($GLOBALS as $var_name => $value) {
if ($value === $var) {
return $var_name;
}
}
return false;
}
Edit: to be clear, there is no good way to do this in PHP, which is probably because you shouldn't have to do it. There are probably better ways of doing what you're trying to do.
You might consider changing your approach and using a variable variable name?
$var_name = "FooBar";
$$var_name = "a string";
then you could just
print($var_name);
to get
FooBar
Here's the link to the PHP manual on Variable variables
No-one seems to have mentioned the fundamental reasons why this is a) hard and b) unwise:
A "variable" is just a symbol pointing at something else. In PHP, it internally points to something called a "zval", which can actually be used for multiple variables simultaneously, either because they have the same value (PHP implements something called "copy-on-write" so that $foo = $bar doesn't need to allocate extra memory straight away) or because they have been assigned (or passed to a function) by reference (e.g. $foo =& $bar). So a zval has no name.
When you pass a parameter to a function you are creating a new variable (even if it's a reference). You could pass something anonymous, like "hello", but once inside your function, it's whatever variable you name it as. This is fairly fundamental to code separation: if a function relied on what a variable used to be called, it would be more like a goto than a properly separate function.
Global variables are generally considered a bad idea. A lot of the examples here assume that the variable you want to "reflect" can be found in $GLOBALS, but this will only be true if you've structured your code badly and variables aren't scoped to some function or object.
Variable names are there to help programmers read their code. Renaming variables to better suit their purpose is a very common refactoring practice, and the whole point is that it doesn't make any difference.
Now, I understand the desire for this for debugging (although some of the proposed usages go far beyond that), but as a generalised solution it's not actually as helpful as you might think: if your debug function says your variable is called "$file", that could still be any one of dozens of "$file" variables in your code, or a variable which you have called "$filename" but are passing to a function whose parameter is called "$file".
A far more useful piece of information is where in your code the debug function was called from. Since you can quickly find this in your editor, you can see which variable you were outputting for yourself, and can even pass whole expressions into it in one go (e.g. debug('$foo + $bar = ' . ($foo + $bar))).
For that, you can use this snippet at the top of your debug function:
$backtrace = debug_backtrace();
echo '# Debug function called from ' . $backtrace[0]['file'] . ' at line ' . $backtrace[0]['line'];
This is exactly what you want - its a ready to use "copy and drop in" function that echo the name of a given var:
function print_var_name(){
// read backtrace
$bt = debug_backtrace();
// read file
$file = file($bt[0]['file']);
// select exact print_var_name($varname) line
$src = $file[$bt[0]['line']-1];
// search pattern
$pat = '#(.*)'.__FUNCTION__.' *?\( *?(.*) *?\)(.*)#i';
// extract $varname from match no 2
$var = preg_replace($pat, '$2', $src);
// print to browser
echo '<pre>' . trim($var) . ' = ' . print_r(current(func_get_args()), true) . '</pre>';
}
USAGE: print_var_name($FooBar)
PRINT: FooBar
HINT
Now you can rename the function and it will still work and also use the function several times in one line! Thanks to #Cliffordlife
And I add a nicer output! Thanks to #Blue-Water
Lucas on PHP.net provided a reliable way to check if a variable exists. In his example, he iterates through a copy of the global variable array (or a scoped array) of variables, changes the value to a randomly generated value, and checks for the generated value in the copied array.
function variable_name( &$var, $scope=false, $prefix='UNIQUE', $suffix='VARIABLE' ){
if($scope) {
$vals = $scope;
} else {
$vals = $GLOBALS;
}
$old = $var;
$var = $new = $prefix.rand().$suffix;
$vname = FALSE;
foreach($vals as $key => $val) {
if($val === $new) $vname = $key;
}
$var = $old;
return $vname;
}
Then try:
$a = 'asdf';
$b = 'asdf';
$c = FALSE;
$d = FALSE;
echo variable_name($a); // a
echo variable_name($b); // b
echo variable_name($c); // c
echo variable_name($d); // d
Be sure to check his post on PHP.net: http://php.net/manual/en/language.variables.php
I made an inspection function for debugging reasons. It's like print_r() on steroids, much like Krumo but a little more effective on objects. I wanted to add the var name detection and came out with this, inspired by Nick Presta's post on this page. It detects any expression passed as an argument, not only variable names.
This is only the wrapper function that detects the passed expression.
Works on most of the cases.
It will not work if you call the function more than once in the same line of code.
This works fine:
die(inspect($this->getUser()->hasCredential("delete")));
inspect() is the function that will detect the passed expression.
We get: $this->getUser()->hasCredential("delete")
function inspect($label, $value = "__undefin_e_d__")
{
if($value == "__undefin_e_d__") {
/* The first argument is not the label but the
variable to inspect itself, so we need a label.
Let's try to find out it's name by peeking at
the source code.
*/
/* The reason for using an exotic string like
"__undefin_e_d__" instead of NULL here is that
inspected variables can also be NULL and I want
to inspect them anyway.
*/
$value = $label;
$bt = debug_backtrace();
$src = file($bt[0]["file"]);
$line = $src[ $bt[0]['line'] - 1 ];
// let's match the function call and the last closing bracket
preg_match( "#inspect\((.+)\)#", $line, $match );
/* let's count brackets to see how many of them actually belongs
to the var name
Eg: die(inspect($this->getUser()->hasCredential("delete")));
We want: $this->getUser()->hasCredential("delete")
*/
$max = strlen($match[1]);
$varname = "";
$c = 0;
for($i = 0; $i < $max; $i++){
if( $match[1]{$i} == "(" ) $c++;
elseif( $match[1]{$i} == ")" ) $c--;
if($c < 0) break;
$varname .= $match[1]{$i};
}
$label = $varname;
}
// $label now holds the name of the passed variable ($ included)
// Eg: inspect($hello)
// => $label = "$hello"
// or the whole expression evaluated
// Eg: inspect($this->getUser()->hasCredential("delete"))
// => $label = "$this->getUser()->hasCredential(\"delete\")"
// now the actual function call to the inspector method,
// passing the var name as the label:
// return dInspect::dump($label, $val);
// UPDATE: I commented this line because people got confused about
// the dInspect class, wich has nothing to do with the issue here.
echo("The label is: ".$label);
echo("The value is: ".$value);
}
Here's an example of the inspector function (and my dInspect class) in action:
http://inspect.ip1.cc
Texts are in spanish in that page, but code is concise and really easy to understand.
From php.net
#Alexandre - short solution
<?php
function vname(&$var, $scope=0)
{
$old = $var;
if (($key = array_search($var = 'unique'.rand().'value', !$scope ? $GLOBALS : $scope)) && $var = $old) return $key;
}
?>
#Lucas - usage
<?php
//1. Use of a variable contained in the global scope (default):
$my_global_variable = "My global string.";
echo vname($my_global_variable); // Outputs: my_global_variable
//2. Use of a local variable:
function my_local_func()
{
$my_local_variable = "My local string.";
return vname($my_local_variable, get_defined_vars());
}
echo my_local_func(); // Outputs: my_local_variable
//3. Use of an object property:
class myclass
{
public function __constructor()
{
$this->my_object_property = "My object property string.";
}
}
$obj = new myclass;
echo vname($obj->my_object_property, $obj); // Outputs: my_object_property
?>
Many replies question the usefulness of this. However, getting a reference for a variable can be very useful. Especially in cases with objects and $this. My solution works with objects, and as property defined objects as well:
function getReference(&$var)
{
if(is_object($var))
$var->___uniqid = uniqid();
else
$var = serialize($var);
$name = getReference_traverse($var,$GLOBALS);
if(is_object($var))
unset($var->___uniqid);
else
$var = unserialize($var);
return "\${$name}";
}
function getReference_traverse(&$var,$arr)
{
if($name = array_search($var,$arr,true))
return "{$name}";
foreach($arr as $key=>$value)
if(is_object($value))
if($name = getReference_traverse($var,get_object_vars($value)))
return "{$key}->{$name}";
}
Example for the above:
class A
{
public function whatIs()
{
echo getReference($this);
}
}
$B = 12;
$C = 12;
$D = new A;
echo getReference($B)."<br/>"; //$B
echo getReference($C)."<br/>"; //$C
$D->whatIs(); //$D
Adapted from answers above for many variables, with good performance, just one $GLOBALS scan for many
function compact_assoc(&$v1='__undefined__', &$v2='__undefined__',&$v3='__undefined__',&$v4='__undefined__',&$v5='__undefined__',&$v6='__undefined__',&$v7='__undefined__',&$v8='__undefined__',&$v9='__undefined__',&$v10='__undefined__',&$v11='__undefined__',&$v12='__undefined__',&$v13='__undefined__',&$v14='__undefined__',&$v15='__undefined__',&$v16='__undefined__',&$v17='__undefined__',&$v18='__undefined__',&$v19='__undefined__'
) {
$defined_vars=get_defined_vars();
$result=Array();
$reverse_key=Array();
$original_value=Array();
foreach( $defined_vars as $source_key => $source_value){
if($source_value==='__undefined__') break;
$original_value[$source_key]=$$source_key;
$new_test_value="PREFIX".rand()."SUFIX";
$reverse_key[$new_test_value]=$source_key;
$$source_key=$new_test_value;
}
foreach($GLOBALS as $key => &$value){
if( is_string($value) && isset($reverse_key[$value]) ) {
$result[$key]=&$value;
}
}
foreach( $original_value as $source_key => $original_value){
$$source_key=$original_value;
}
return $result;
}
$a = 'A';
$b = 'B';
$c = '999';
$myArray=Array ('id'=>'id123','name'=>'Foo');
print_r(compact_assoc($a,$b,$c,$myArray) );
//print
Array
(
[a] => A
[b] => B
[c] => 999
[myArray] => Array
(
[id] => id123
[name] => Foo
)
)
If the variable is interchangable, you must have logic somewhere that's determining which variable gets used. All you need to do is put the variable name in $variable within that logic while you're doing everything else.
I think we're all having a hard time understanding what you're needing this for. Sample code or an explanation of what you're actually trying to do might help, but I suspect you're way, way overthinking this.
I actually have a valid use case for this.
I have a function cacheVariable($var) (ok, I have a function cache($key, $value), but I'd like to have a function as mentioned).
The purpose is to do:
$colour = 'blue';
cacheVariable($colour);
...
// another session
...
$myColour = getCachedVariable('colour');
I have tried with
function cacheVariable($variable) {
$key = ${$variable}; // This doesn't help! It only gives 'variable'.
// do some caching using suitable backend such as apc, memcache or ramdisk
}
I have also tried with
function varName(&$var) {
$definedVariables = get_defined_vars();
$copyOfDefinedVariables = array();
foreach ($definedVariables as $variable=>$value) {
$copyOfDefinedVariables[$variable] = $value;
}
$oldVar = $var;
$var = !$var;
$difference = array_diff_assoc($definedVariables, $copyOfDefinedVariables);
$var = $oldVar;
return key(array_slice($difference, 0, 1, true));
}
But this fails as well... :(
Sure, I could continue to do cache('colour', $colour), but I'm lazy, you know... ;)
So, what I want is a function that gets the ORIGINAL name of a variable, as it was passed to a function. Inside the function there is no way I'm able to know that, as it seems. Passing get_defined_vars() by reference in the second example above helped me (Thanks to Jean-Jacques Guegan for that idea) somewhat. The latter function started working, but it still only kept returning the local variable ('variable', not 'colour').
I haven't tried yet to use get_func_args() and get_func_arg(), ${}-constructs and key() combined, but I presume it will fail as well.
I have this:
debug_echo(array('$query'=>$query, '$nrUsers'=>$nrUsers, '$hdr'=>$hdr));
I would prefer this:
debug_echo($query, $nrUsers, $hdr);
The existing function displays a yellow box with a red outline and shows each variable by name and value. The array solution works but is a little convoluted to type when it is needed.
That's my use case and yes, it does have to do with debugging. I agree with those who question its use otherwise.
Here's my solution based on Jeremy Ruten
class DebugHelper {
function printVarNames($systemDefinedVars, $varNames) {
foreach ($systemDefinedVars as $var=>$value) {
if (in_array($var, $varNames )) {
var_dump($var);
var_dump($value);
}
}
}
}
using it
DebugHelper::printVarNames(
$systemDefinedVars = get_defined_vars(),
$varNames=array('yourVar00', 'yourVar01')
);
You could use compact() to achieve this.
$FooBar = "a string";
$newArray = compact('FooBar');
This would create an associative array with the variable name as the key. You could then loop through the array using the key name where you needed it.
foreach($newarray as $key => $value) {
echo $key;
}
I think you want to know variable name with it's value. You can use an associative array to achieve this.
use variable names for array keys:
$vars = array('FooBar' => 'a string');
When you want to get variable names, use array_keys($vars), it will return an array of those variable names that used in your $vars array as it's keys.
This is the way I did it
function getVar(&$var) {
$tmp = $var; // store the variable value
$var = '_$_%&33xc$%^*7_r4'; // give the variable a new unique value
$name = array_search($var, $GLOBALS); // search $GLOBALS for that unique value and return the key(variable)
$var = $tmp; // restore the variable old value
return $name;
}
Usage
$city = "San Francisco";
echo getVar($city); // city
Note: some PHP 7 versions will not work properly due to a bug in array_search with $GLOBALS, however all other versions will work.
See this https://3v4l.org/UMW7V
There is no predefined function in PHP that can output the name of a variable. However, you can use the result of get_defined_vars(), which returns all the variables defined in the scope, including name and value. Here is an example:
<?php
// Function for determining the name of a variable
function getVarName(&$var, $definedVars=null) {
$definedVars = (!is_array($definedVars) ? $GLOBALS : $definedVars);
$val = $var;
$rand = 1;
while (in_array($rand, $definedVars, true)) {
$rand = md5(mt_rand(10000, 1000000));
}
$var = $rand;
foreach ($definedVars as $dvName=>$dvVal) {
if ($dvVal === $rand) {
$var = $val;
return $dvName;
}
}
return null;
}
// the name of $a is to be determined.
$a = 1;
// Determine the name of $a
echo getVarName($a);
?>
Read more in How to get a variable name as a string in PHP?
Why don't you just build a simple function and TELL it?
/**
* Prints out $obj for debug
*
* #param any_type $obj
* #param (string) $title
*/
function print_all( $obj, $title = false )
{
print "\n<div style=\"font-family:Arial;\">\n";
if( $title ) print "<div style=\"background-color:red; color:white; font-size:16px; font-weight:bold; margin:0; padding:10px; text-align:center;\">$title</div>\n";
print "<pre style=\"background-color:yellow; border:2px solid red; color:black; margin:0; padding:10px;\">\n\n";
var_export( $obj );
print "\n\n</pre>\n</div>\n";
}
print_all( $aUser, '$aUser' );
I was looking for this but just decided to pass the name in, I usually have the name in the clipboard anyway.
function VarTest($my_var,$my_var_name){
echo '$'.$my_var_name.': '.$my_var.'<br />';
}
$fruit='apple';
VarTest($fruit,'fruit');
I know this is old and already answered but I was actually looking for this. I am posting this answer to save people a little time refining some of the answers.
Option 1:
$data = array('$FooBar');
$vars = [];
$vars = preg_replace('/^\\$/', '', $data);
$varname = key(compact($vars));
echo $varname;
Prints:
FooBar
For whatever reason you would find yourself in a situation like this, it does actually work.
.
Option 2:
$FooBar = "a string";
$varname = trim(array_search($FooBar, $GLOBALS), " \t.");
echo $varname;
If $FooBar holds a unique value, it will print 'FooBar'. If $FooBar is empty or null it will print the name of the first empty or null string it finds.
It could be used as such:
if (isset($FooBar) && !is_null($FooBar) && !empty($FooBar)) {
$FooBar = "a string";
$varname = trim(array_search($FooBar, $GLOBALS), " \t.");
}
other use:
shrug
function varsToArrayAssoc(...$arguments){
$bt = debug_backtrace();
$file = file($bt[0]['file']);
$src = $file[$bt[0]['line']-1];
$pat = '#(.*)'.__FUNCTION__.' *?\( *?(.*) *?\)(.*)#i';
$vars =explode(',',substr_replace(trim(preg_replace($pat, '$2', $src)) ,"", -1));
$result=[];
foreach(func_get_args() as $key=>$v){
$index=trim(explode('$',$vars[$key])[1]);
$result[$index]=$v;
}
return $result;
}
$a=12;
$b=13;
$c=123;
$d='aa';
var_dump(varsToArrayAssoc($a,$b,$c,$d));
Use this to detach user variables from global to check variable at the moment.
function get_user_var_defined ()
{
return array_slice($GLOBALS,8,count($GLOBALS)-8);
}
function get_var_name ($var)
{
$vuser = get_user_var_defined();
foreach($vuser as $key=>$value)
{
if($var===$value) return $key ;
}
}
It may be considered quick and dirty, but my own personal preference is to use a function/method like this:
public function getVarName($var) {
$tmp = array($var => '');
$keys = array_keys($tmp);
return trim($keys[0]);
}
basically it just creates an associative array containing one null/empty element, using as a key the variable for which you want the name.
we then get the value of that key using array_keys and return it.
obviously this gets messy quick and wouldn't be desirable in a production environment, but it works for the problem presented.
why we have to use globals to get variable name... we can use simply like below.
$variableName = "ajaxmint";
echo getVarName('$variableName');
function getVarName($name) {
return str_replace('$','',$name);
}
I really fail to see the use case... If you will type print_var_name($foobar) what's so hard (and different) about typing print("foobar") instead?
Because even if you were to use this in a function, you'd get the local name of the variable...
In any case, here's the reflection manual in case there's something you need in there.

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