Learning PHP
Advanced PHP
PHP Function Reference
PHP Useful Resources
Selected Reading
© 2011 TutorialsPoint.COM
|
PHP Function array_filter()
Syntax
array array_filter ( array $input [, callback $callback] );
|
Definition and Usage
Iterates over each value in the input array passing them to the callback function. If the callback function returns true, the current value from input is returned into the result array. Array keys are preserved.
Paramters
Parameter | Description |
input | The array to iterate over |
callback | The callback function to use |
If no callback is supplied, all entries of input equal to FALSE will be removed.
Return Values
Returns the filtered array.
Example
Try out following example:
<?php
function odd($var)
{
return($var & 1);
}
function even($var)
{
return(!($var & 1));
}
$array1 = array("a"=>1, "b"=>2, "c"=>3, "d"=>4, "e"=>5);
$array2 = array(6, 7, 8, 9, 10, 11, 12);
echo "Odd :\n";
print_r(array_filter($array1, "odd"));
echo "Even:\n";
print_r(array_filter($array2, "even"));
?>
|
This will produce following result:
Odd :
Array ( [a] => 1 [c] => 3 [e] => 5)
Even:
Array ( [0] => 6 [2] => 8 [4] => 10 [6] => 12)
|
|
|
|