Check the method was called in php - php

Question

I have following php code in basic.php. How can I determine if the method row() was called? When I write next <?php $basic->row(); ?> it shows something like this - the method was defined!
Example
$basic->container(); // container was called
$basic->container(); // when called again, i need show some warning - CONTAINER CAN BE PUT ONLY ONCE and using exit() for example
This is the solution what i need
public function container(){
static $container = false;
if ( $container ){ return; } else { print '<div class="container">'; } $container = true;
}

Answer 1

If you want to know if an object has a method or not before calling it, you can use method_exists.
if(method_exists($basic, 'row')) {
$basic->row();
}

Answer 2

Use the echo construct inside the row function like this:
// your code
function row(){
echo "Function called!";
....
}
This will print the text "Function called!" everytime you call the function.

Answer 3

I just add it as an answer ... try smthg like this:
function row(){
if($wascalled === true) {
echo "The function was called";
}
//your Code here
$wascalled = true;
}
So, the first time you call the function, nothing happens, if you call it more, the message will appear. It looks ugly and i dont see much sense in it, but it seems to work.

Answer 4

I did not understand if you mean really a call or if the method is defined.
As #Prasanth said, if you mean if the method is defined - method_exists will be a solution.
Otherwise, you can check my answer here: Cahining pattern
It's related to your problem, as you need a generic way to register a method been called before.
You, ofcourse, can write down
public $_row = false;
public function row() {
$this->_row = true;
// some stuff
}
and later:
if (!$basic->_row) {
$basic->row();
}
You just need a property where you will set a value, which corresponds to your script later. I.e. here the default value is false - it means the method hasn't been called yet. Once method is called, it changes it to true. You are testing if the value is default (false) then call.
You may not change the value to true, but to the string you wanted. E.g. $this->_row = 'the method was defined!' Or set to true and print the string, if $this->_row == true.

Answer 5

Reference
bool function_exists ( string $function_name )
Parameters The $function_name, as a string.
Returns TRUE if function_name exists and is a function, FALSE otherwise.
Note:
This function will return FALSE for constructs, such as include_once and echo.
<?php
if (function_exists('function_name')) {
echo "IMAP functions are available.<br />\n";
} else {
echo "IMAP functions are not available.<br />\n";
}
?>
Take this as an example
<?php
if (function_exists('foo')) {
print "foo defined\\n";
} else {
print "foo not defined\\n";
}
function foo() {}
if (function_exists('bar')) {
print "bar defined\\n";
} else {
print "defining bar\\n";
function bar() {}
}
print "calling bar\\n";
bar(); // ok to call function conditionally defined earlier
print "calling baz\\n";
baz(); // ok to call function unconditionally defined later
function baz() {}
qux(); // NOT ok to call function conditionally defined later
if (!function_exists('qux')) {
function qux() {}
}
?>
Prints:
foo defined
defining bar
calling bar
calling baz
PHP Fatal error: Call to undefined function qux()
Alternative method

Answer 6

You can use magic method __call.
class Basic{
function row(){
print ' Call method '.__METHOD__.'<br/>';
}
function __call($method,$params){
if (method_exists($this, $method)) {
call_user_func_array(array($this, $method), $params);
}else{
print 'Class '.__CLASS__.' hasn`t method "'.$method.'"<br/>';
}
}
}
$basic = new Basic();
$basic->row();
$basic->fetch();
// output
Call method Basic::row
Class Basic hasn`t method "fetch"