PHP FILTER_CALLBACK in OOP Class

Question

Hi I've been playing around with phps filter class getting and have come across a snag with the filter_callback filter.

the following rough bit of code works but shows an error every time

Warning: filter_var() [function.filter-var]: First argument is expected to be a valid callback in /Users/Rob/sites/test_val.php on line 12

class test

{

public function callback($string)
{

$var = filter_var($string, FILTER_CALLBACK, array('options' => $this->foo($string)));

} 

public function foo($string){

echo $string;


}

}


$test = new test();

$string = 'test';

$tested = $test->callback($string);

am i calling the function correctly or is there a different way?

possible duplicate of How to use an object method as a callback function — Gordon
– Gordon, Commented Jul 29, 2011 at 6:39

George Marian · Accepted Answer · 2014-11-14 15:29:05Z

10

$this->foo($string)

...should be...

array($this, 'foo')

When using a method as a callback, you need to provide the reference in this manner.

Documentation.

edited Nov 14, 2014 at 15:29

George Marian

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answered Jul 29, 2011 at 6:34

alex

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2 Comments

Robert Over a year ago

thanks for your help, is their a way to pass multiple variables to the function callback?

alex Over a year ago

@Robert The function uses the callback, not you, so you can't pass additional arguments.

Hirdesh Vishwdewa · Accepted Answer · 2016-06-09 11:32:46Z

3

This code works for me :)

 <?php
    class myClass {
     public function myFunc($var){
       return filter_var($var, FILTER_CALLBACK, array('options'=> 'self::myCallback'));
     }
     public function myCallback(){
      return true;
     }
    }
$obj = new myClass();

var_dump($obj->myFunc("[email protected]"));
//output:- bool(true)

?>

answered Jun 9, 2016 at 11:32

Hirdesh Vishwdewa

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Comments

PFinal南丞 · Accepted Answer · 2021-07-09 03:01:44Z

0

echo filter_var('wo9w9w9', FILTER_CALLBACK, array('options' => array(new MyFilter(), 'filter1'))) . PHP_EOL;

options You can directly transfer object instance, like $this or new self ,

answered Jul 9, 2021 at 3:01

PFinal南丞

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