PHP ʖ²ἯTH º󍋼/A array_keys =ד 1. array_keys() =ד $array = array (0 = 100, "color" = "red"); print_r(array_keys ($array)); $array = array ("blue", "red", "green", "blue", "blue"); print_r(array_keys ($array, "blue")); $array = array ("color" = array("blue", "red", "green"), "size" = array("small", "medium", "large")); print_r(array_keys ($array)); Array ([0] = 0 [1] = color) Array ([0] = 0 [1] = 3 [2] = 4) Array ([0] = color [1] = size) ע: ±¾º¯ʽʇ PHP 4 ЂԶµģ¬ςæʇȔԚʹӃ PHP 3 µēû§µĊµϖ·½·¨£º =ד 2. array_keys() Ԛ PHP 3 ֐µĊµϖ function array_keys ($arr, $term="") {$t = array(); while (list($k,$v) = each($arr)) {if ($term $v != $term) {continue;} $t[] = $k;} return $t;} º󍋼/A ưµ㼯A array_key_exists ɏһ¼¶ array_map