implode 使用一个字符串将数组变成字符串 ``` <?php $array= array('lastname', 'email', 'phone'); $comma_separated= implode(",", $array); echo $comma_separated; // lastname,email,phone // Empty string when using an empty array: var_dump(implode('hello', array())); // string(0) ?> ``` explode — 使用一个字符串分割另一个字符串，返回一个数组 ``` <?php // 示例 1 $pizza = "piece1 piece2 piece3 piece4 piece5 piece6"; $pieces = explode(" ", $pizza); echo $pieces[0]; // piece1 echo $pieces[1]; // piece2 // 示例 2 $data = "foo:*:1023:1000::/home/foo:/bin/sh"; list($user, $pass, $uid, $gid, $gecos, $home, $shell) = explode(":", $data); echo $user; // foo echo $pass; // * ?> ```