array_search() is what you are looking for. ... If you only need the key of the first match, use array_search() : $key = array_search(5, $array); ... ... <看更多>

php in_array_vs_isset_vs_array_key_exists.php Function call in_array took ... whereas 'isset' and 'array_key_exists' searches for a key inside an array! ... <看更多>