使用implode()函数将数组逗号隔开连接为字符串

<form action="2.php" method="post">
<input name="select[]" type="checkbox" value="1" />1
<input name="select[]" type="checkbox" value="2" />2
<input name="select[]" type="checkbox" value="3" />3
<input type="submit" value="submie" />
</form>

<?php
$array = $_POST["select"];
$select = implode(",", $array);
echo $select;
?>