array_filter

Definition and usage

array_filter() function uses a callback function to filter values ​​in an array.

This function passes each key value in the input array to the callback function. If the callback function returns true, the current key value in the input array is returned to the result array. The array key names remain unchanged.

Example

Use callback functions to filter elements in an array:

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

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

Try it yourself

grammar

 array_filter ( array , callbackfunction ) ;