The PHP array_filter() function filters the values of an array using a callback function, passing 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.
<?php
function test_odd($var) {
return($var & 1);
}
$a1 = array(1, 2, 3, 4, 5);
print_r(array_filter($a1, 'test_odd'));
?>
Output
Array ( [0] => 1 [2] => 3 [4] => 5 )
Syntax
array_filter(array, callbackfunction, flag)
Parameters
| Parameter | Description |
|---|---|
| array | Specifies the array to filter (required) |
| callbackfunction | Specifies the callback function to use |
| flag | Specifies what arguments are sent to callback
|
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PHP NOTES:
- When using PHP, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
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