Returning array of given keys from an array

Votes : 3.3
598
Simple one, I was just wondering if there is a clean and eloquent way of returning all values from an associative array that do match a given key(s)? Here's what I mean:
//source array
$source = array('key_1'=>'value_1','key_2'=>'value_2','key_3'=>'value_3','key_4'=>'value_4','key_5'=>'value_5');

// Required keys
$filter1 = array('key_1','key_2');
$filter2 = array('key_3','key_4','key_5');
I wish to get result as : Array( ['key_1'] => 'value_1', ['key_2'] =>'value_2' ) // First $filter1 array Array( ['key_3'] => 'value_3', ['key_4'] =>'value_4', ['key_5'] =>'value_5', ) // Second $filter_2 array

Your Answer

1 Answer

answered
This function compatible with any php version.
function array_filter($source,$filters){
    $return = array();
    foreach($filters as $filter){
         if(isset($source[$filter]))$return[$filter] = $source[$filter];
    }
    return $source;
}

array_filter($source,$filter1);

2 Answer

answered
array_flip function use to convert $filter1 & $filter2 array values to keys, then source values fill into generate new array keys by using array_intersect_key function

array_intersect_key( $source , array_flip( $filter1 ));   /*For first $filter1 array.*/

array_intersect_key( $source , array_flip( $filter2 )) ;

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