废话少说，上代码

首先字符串转数组 => explode()函数

<?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; // *
?>

数组转字符串 => implode ()函数

<?php
  $array = array('lastname', 'email', 'phone');
  $comma_separated = implode(",", $array);
  var_dump(comma_separated ); // 数组被转为字符串
?>

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