array_match_string.php

<?php

/**
 * Search the array for a part of a string in the values and return an array with matching elements
 *
 * @param  array  $haystack The array.
 * @param  string $needle   The searched value.
 * @return array  The filtered array.
 */
function array_match_string(array $haystack, $needle){
    return array_filter($haystack, function($value) use ($needle){
        // You may use strpos for case-sensitive or preg_match for more complex searches
        return stripos($value, $needle) !== false;
   });
}

A simple function to search for a part of an array value (unlike array_search which searches for the full value). It returns an array with all elements, matching the search string in the value of the element (preserving the original index). This function requires PHP >= 5.3 as it uses the "use" keyword and an anonymous funtion. For lower PHP versions, check my alternative with two functions in this Stackoverflow answer.