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PHP array_filter() Function

< PHP Array Reference

Example

Fill an array with values, specifying keys:

<?php
function test_odd($var)
{
return($var & 1);
}

$a1=array("a","b",2,3,4);
print_r(array_filter($a1,"test_odd"));
?>

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);

Parameter	Description
array	Required. Specifies the array to filter
callbackfunction	Required. Specifies the callback function to use

Technical Details

Return Value:	Returns the filtered array
PHP Version:	4.0.6+

< PHP Array Reference