how can i check if logo exists in this array called $attachements print_r is below:
Array (
[logo] => /home/richar2/public_html/ioagh/images/stories/jreviews/20100510115659_1_img.gif
)
when theres no logo, the array print_r's
Array ( )
i tried:
if (isset($attachments['logo']) ) {..}
but the conditional code runs when there is no logo
Use the function array_key_exists.
http://php.net/manual/en/function.array-key-exists.php
It's very stange that isset() is not working, I am pretty sure it should. Maybe you have a problem elsewhere in your code.
Anyway, if you want to try something else, there is a specific function: array_key_exists()
This works for me as expected:
$arr['logo'] = '/home/richar2/public_html/ioagh/images/stories/jreviews/20100510115659_1_img.gif';
print_r($arr);
if (isset($arr['logo'])){
echo $arr['logo'];
}else{
echo 'Key doesn\'t exist!';
}
Are you sure you set $arr['logo'] = null, not $arr['logo'] = ''?
For the latter you can also check
if (isset($arr['logo'] && !empty($arr['logo'])){
...
}
but the conditional code runs when
there is no logo
You could construct an else clause to take appropriate action:
if (isset($attachments['logo']))
{
// logo is set
}
else
{
// loto is not set
}
Or simply try this:
if (array_key_exists('logo', $attachments))
{
// logo is set
}
More info on array_key_exists
You can use array_key_exists.
you could write it like:
function md_array_key_exists ($key, $array)
{
foreach ($array as $item => $val)
{
if ($item === $key)
{
return true;
}
if (is_array ($val))
{
if (true == marray_key_exists ($key, $val))
return true;
}
}
return false;
}
Related
I need a help. I have two arrays. I need to check if the values in first array are present in second or not. The arrays are as:
$maindata=array(array('id'=>3),array('id'=>7),array('id'=>9));
$childata=array(array('id'=>7),array('id'=>11),array('id'=>3),array('id'=>123));
Here, I need to check if each value from first array is present inside second array or not. If yes, then should return true else false at each time.
Here you go, you can use the in_array() for PHP.
$maindata=array( array('id'=>3),array('id'=>7),array('id'=>9) );
$childata=array( array('id'=>7),array('id'=>11),array('id'=>3),array('id'=>123) );
foreach( $maindata as $key => $value )
{
if( in_array( $value, $childata ) )
{
echo true;
}
else
{
echo false;
}
}
You could also remove the whole if else and replace with a single line.
echo ( in_array( $value, $childata ) ? true : false );
Reference -
http://php.net/manual/en/function.in-array.php
https://code.tutsplus.com/tutorials/the-ternary-operator-in-php--cms-24010
To check if an array contains a value:
if (in_array($value, $array)) {
// ... logic here
}
To check if an array contains a certain key:
if (array_key_exists($key, $array)) {
// ... logic here
}
Resources
in_array - PHP Manual
array_key_exists() - PHP Manual
Following code will return true only if all elements of main array exists in second array, false otherwise:
$maindata=array(array('id'=>3),array('id'=>7),array('id'=>9));
$childata=array(array('id'=>3),array('id'=>7),array('id'=>11),array('id'=>123));
$match = 0;
foreach( $maindata as $key => $value ) {
if( in_array( $value, $childata ) ) {
$match++;
}
}
if($match == count($maindata)){
// return true;
} else {
// return false;
}
Use array_intersect
if(!empty(array_intersect($childata, $maindata)))
{
//do something
}
or
$result = count(array_intersect($childata, $maindata)) == count($childata);
Use array_column and array_intersect.
$first = array_column($maindata, 'id');
$second = array_column($childata, 'id');
//If intersect done, means column are common
if (count(array_intersect($first, $second)) > 0) {
echo "Value present from maindata in childata array.";
}
else {
echo "No values are common.";
}
I have an array where each element has a subarray with multiple Ids. When looping through the array, I'd like to check if the subarray has any elements besides a given one.
For example, I'd like to echo 'Yes' whenever one of the subarrays has any ids other than 'TESTID'.
I can do this by looping through the subarray, but I'd like to know of a way that doesn't require double loops.
Here's the current code:
foreach ($elements as $element) {
...
if (besidesInArray('TESTID',$element['ids'])) {
//operations
} else {
//element only has 'TESTID'
}
...
}
...
function besidesInArray($needle, $haystack) {
foreach ($haystack as $hay) {
if($hay != $needle) {
return TRUE;
}
}
return FALSE;
}
While this code works, I'd like to see if there's a more elegant solution.
You can use in_array() function to achieve this
foreach($array as $key => $subarray)
{
if(in_array("TESTID", $subarray))
{
//found
} else {
//not found
}
}
preg_grep for TESTID but invert the grep so that it returns entries NOT matching.
foreach($array as $subarray) {
if(preg_grep("/TESTID/", $subarray, PREG_GREP_INVERT)) {
echo 'Yes'; //others found
}
}
TESTID could be a var instead. Man I love some preg_grep!
find = implode(')|(',$mypatternarray);
find.="(".find.")";
foreach($subarray as $subar){
if(preg_match("find",$subar)>0)){
echo "id found";
}
}
I have an interesting question today. Lets say I have an array of form fields:
array('field1', 'field2', 'field3');
I would basically want to generate an if statement which check if all of the provided fields are exists or not.
So something like this:
function ($array){
$stm = '';
foreach($array as $key){
$stm .= 'isset($_POST['.$key.']) && ';
}
if (rtrim($stm, ' && ')){
echo 'Fields are exists.';
}
}
The problem with the above function is that it takes the created statement as a String and not a variable, so it always exsits. Is there any way that I can generate something like this, which would work?
You're thinking about this the wrong way. If I understood correctly, you have an array of values, that are also POST keys, and you want to check if all of them are set. In this case I'd do something like:
function isset_multiple($array){
foreach($array as $post_key){
if(!isset($_POST[$post_key])) // if one of them is not set, return false
return false;
}
return true; // none of the foreach loops returned false, so all must be set
}
What you can do is check if array keys are set by using variable names, for example
$keyName = "field1";
if ( isset($_POST[$keyName]) === true ) { /* ... */ }
The example above can be implemented in a foreach loop.
Just execute the isset and count:
function ($array){
$count = 0;
foreach($array as $key){
if (isset($_POST[$key]) $count++;
else // you can already exit here...
}
if (count($array) === $count){
echo 'All fields exist.';
}
}
Try this..
function arrayHasKeys(array $array, array $keys)
{
return !((bool) array_diff_key($array, $keys));
}
var_dump(arrayHasKeys($_POST, array('field1', 'field2', 'field3')));
Its quite simple and reusable. Its not a good practice to use global vars inside a function.
Is it possible to use array_map() to test values of an array? I want to make sure that all elements of an array are numeric.
I've tried both
$arrays = array(
array(0,1,2,3 )
, array ( 0,1, "a", 5 )
);
foreach ( $arrays as $arr ) {
if ( array_map("is_numeric", $arr) === FALSE ) {
echo "FALSE\n";
} else {
echo "TRUE\n";
}
}
and
$arrays = array(
array(0,1,2,3 )
, array ( 0,1, "a", 5 )
);
foreach ( $arrays as $arr ) {
if ( ( array_map("is_numeric", $arr) ) === FALSE ) {
echo "FALSE\n";
} else {
echo "TRUE\n";
}
}
And for both I get
TRUE
TRUE
Can this be done? If so, what am I doing wrong?
Note: I am aware that I can get my desired functionality from a foreach loop.
array_map returns an array. So it will always be considered 'true'. Now, if you array_search for FALSE, you might be able to get the desire effects.
From the PHP.net Page
array_map() returns an array containing all the elements of
arr1 after applying the callback function to each one.
This means that currently you have an array that contains true or false for each element. You would need to use array_search(false,$array) to find out if there are any false values.
I'm usually a big advocate of array_map(), array_filter(), etc., but in this case foreach() is going to be the best choice. The reason is that with array_map() and others it will go through the entire array no matter what. But for your purposes you only need to go through the array until you run into a value for which is_numeric() returns false, and as far as I know there's no way in PHP to break out of those methods.
In other words, if you have 1,000 items in your array and the 5th one isn't numeric, using array_map() will still check the remaining 995 values even though you already know the array doesn't pass your test. But if you use a foreach() instead and have it break on is_numeric() == false, then you'll only need to check those first five elements.
You could use filter, but it ends up with a horrible bit of code
$isAllNumeric = count(array_filter($arr, "is_numeric")) === count($arr)
Using a custom function makes it a bit better, but still not perfect
$isAllNumeric = count(array_filter($arr, function($x){return !is_numeric($x);})) === 0
But if you were using custom functions array_reduce would work, but it still has some failings.
$isAllNumeric = array_reduce($arr,
function($x, $y){ return $x && is_numeric($y); },
true);
The failings are that it won't break when it has found what it wants, so the functional suggestions above are not very efficient. You would need to write a function like this:
function array_find(array $array, $callback){
foreach ($array as $x){ //using iteration as PHP fails at recursion
if ( call_user_func($callback, array($x)) ){
return $x;
}
}
return false;
}
And use it like so
$isAllNumeric = array_find($arr, function($x){return !is_numeric($x);})) !== false;
i have two tiny but extremely useful functions in my "standard library"
function any($ary, $func) {
foreach($ary as $val)
if(call_user_func($func, $val)) return true;
return false;
}
function all($ary, $func) {
foreach($ary as $val)
if(!call_user_func($func, $val)) return false;
return true;
}
in your example
foreach ( $arrays as $arr )
echo all($arr, 'is_numeric') ? "ok" : "not ok";
A more elegant approach IMHO:
foreach ($arrays as $array)
{
if (array_product(array_map('is_numeric', $array)) == true)
{
echo "TRUE\n";
}
else
{
echo "FALSE\n";
}
}
This will return true if all the values are numeric and false if any of the values is not numeric.
I'm working on a program that uses PHP's internal array pointers to iterate along a multidimensional array. I need to get an element from the current row, and I've been doing it like so:
$arr[key($arr)]['item']
However, I'd much prefer to use something like:
current($arr)['item'] // invalid syntax
I'm hoping there's a function out there that I've missed in my scan of the documentation that would enable me to access the element like so:
getvalue(current($arr), 'item')
or
current($arr)->getvalue('item')
Any suggestions?
I very much doubt there is such a function, but it's trivial to write
function getvalue($array, $key)
{
return $array[$key];
}
Edit: As of PHP 5.4, you can index array elements directly from function expressions, current($arr)['item'].
Have you tried using one of the iterator classes yet? There might be something in there that does exactly what you want. If not, you can likely get what you want by extending the ArrayObject class.
This function might be a bit lenghty but I use it all the time, specially in scenarious like:
if (array_key_exists('user', $_SESSION) === true)
{
if (array_key_exists('level', $_SESSION['user']) === true)
{
$value = $_SESSION['user']['level'];
}
else
{
$value = 'DEFAULT VALUE IF NOT EXISTS';
}
}
else
{
$value = 'DEFAULT VALUE IF NOT EXISTS';
}
Turns to this:
Value($_SESSION, array('user', 'level'), 'DEFAULT VALUE IF NOT EXISTS');
Here is the function:
function Value($array, $key = 0, $default = false)
{
if (is_array($array) === true)
{
if (is_array($key) === true)
{
foreach ($key as $value)
{
if (array_key_exists($value, $array) === true)
{
$array = $array[$value];
}
else
{
return $default;
}
}
return $array;
}
else if (array_key_exists($key, $array) === true)
{
return $array[$key];
}
}
return $default;
}
PS: You can also use unidimensional arrays, like this:
Value($_SERVER, 'REQUEST_METHOD', 'DEFAULT VALUE IF NOT EXISTS');
If this does not work, how is your multidimensional array composed? A var_dump() might help.
$subkey = 'B';
$arr = array(
$subkey => array(
'AB' => 'A1',
'AC' => 'A2'
)
);
echo current($arr[$subkey]);
next($arr[$subkey]);
echo current($arr[$subkey]);
I often use
foreach ($arr as $key=>$val) {
$val['item'] /*$val is the value of the array*/
$key /*$key is the key used */
}
instead of
next($arr)/current($arr)