php - How to filter an array by a condition -

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i have array this:

array("a" => 2, "b" => 4, "c" => 2, "d" => 5, "e" => 6, "f" => 2)

now want filter array condition , keep elements value equal 2 , delete elements value not 2.

so expected result array be:

array("a" => 2, "c" => 2, "f" => 2)

note: want keep keys original array.

how can php? built-in functions?

$fullarray = array('a'=>2,'b'=>4,'c'=>2,'d'=>5,'e'=>6,'f'=>2);   function filterarray($value){     return ($value == 2); }  $filteredarray = array_filter($fullarray, 'filterarray');  foreach($filteredarray $k => $v){     echo "$k = $v"; }

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