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array_filter
Filters elements of an array using a callback function
(PHP 4 >= 4.0.6, PHP 5)
array array_filter ( array input [, callback callback] )
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.
Parameters
- input
The array to iterate over
- callback
The callback function to use
If no callback is supplied, all entries of input equal to
FALSE(see converting to boolean) will be removed.
Examples
Example 245. array_filter() 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"));
?>The above example will output:
Odd :
Array
(
[a] => 1
[c] => 3
[e] => 5
)
Even:
Array
(
[0] => 6
[2] => 8
[4] => 10
[6] => 12
) ?>
Example 246. array_filter() without callback
<?php
$entry = array(
0 => 'foo',
1 => false,
2 => -1,
3 => null,
4 => ''
);
print_r(array_filter($entry));
?>The above example will output:
Array
(
[0] => foo
[2] => -1
)