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// поиск в строке (strpos)
function in_string($haystack, $needle) {

    if (is_array($needle)) {
        foreach ($needle as $n) {
            if (mb_strpos($haystack, $n) !== false) return true;
        }
    } 

    else return mb_stripos($haystack, $needle) !== false;
}

// http://community.sitepoint.com/t/in-string-like-in-array/3562/4