php - array_filter

Description

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.

Return Values

Returns the filtered array.

Examples

Example 240. array_filter() example


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 241. array_filter() without callback


$entry = array(
0 => 'foo',
1 => false,
2 => -1,
3 => null,
4 => ''
);
print_r(array_filter($entry));
The above example will output:

Array(

[0] => foo
 [2] => -1

)