PHP array_filter() Function
Example
Filter the values of an array using a callback function:
<?php
function test_odd($var)
{
return($var & 1);
}
$a1=array(1,3,2,3,4);
print_r(array_filter($a1,"test_odd"));
?>
Try it Yourself »
Definition and Usage
The array_filter() function filters the values of an array using a callback function.
This function passes each value of the input array to the callback function. If the callback function returns true, the current value from input is returned into the result array. Array keys are preserved.
Syntax
array_filter(array, callbackfunction, flag)
Parameter Values
| Parameter | Description |
|---|---|
| array | Required. Specifies the array to filter |
| callbackfunction | Optional. Specifies the callback function to use |
| flag | Optional. Specifies what arguments are sent to callback:
|
Technical Details
| Return Value: | Returns the filtered array |
|---|---|
| PHP Version: | 4.0.6+ |
| PHP Changelog: | PHP 5.6: Added optional flag parameter |
❮ PHP Array Reference
