Filter associative array with an array of keys

filter-assoc-array.php

<?php

$data = array(
    'key1' => 'val1',
    'key2' => 'val2',
    'key3' => 'val3',
    'key4' => 'val4',
    'key5' => 'val5',
    'key6' => 'val6',
    'key7' => 'val7',
);

$wanted = array('key2', 'key5', 'key7');

$flipped = array_flip($wanted);

$result = array_intersect_key($data, $flipped);

/*

$result will have the following:

'key2' => 'val2'
'key5' => 'val5'
'key7' => 'val7'

*/

?>