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PHP array_filter() Function
PHP array_filter() Function
PHP array_filter() Function is used to filter the elements of any given array using a user-defined function which is also called a callback function. It iterates over each value in the array, passing them to the user-defined function or the callback function. It takes three parameters out of which one is mandatory and the other two are optional.
Syntax:
array_filter($array, $callbackfunction, $flag);
Parameter Values
| Parameter | Description |
|---|---|
| array | This is a required parameter. This parameter defines the array to filter. |
| callbackfunction | This is an optional parameter. This parameter defines the callback function to use. |
| flag | This is an optional parameter. This parameter defines what arguments are sent to callbackfunction. |
Here is an example of array_filter() function in PHP:
<html>
<body>
<pre>
<?php
function odd($var)
{
return($var%2);
}
$x=array(1,2,3,4,5,6,7,8,9,10);
print_r(array_filter($x,"odd"));
?>
</pre>
</body>
</html>
Output:
Array
(
[0] => 1
[2] => 3
[4] => 5
[6] => 7
[8] => 9
)
Example 2:
<html>
<body>
<pre>
<?php
function even($var)
{
if($var%2==0)
return TRUE;
else
return FALSE;
}
for($i=1;$i<=20;$i++)
{
$x[]= $i;
}
print_r(array_filter($x,"even"));
?>
</pre>
</body>
</html>
Output:
Array
(
[1] => 2
[3] => 4
[5] => 6
[7] => 8
[9] => 10
[11] => 12
[13] => 14
[15] => 16
[17] => 18
[19] => 20
)
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