php中数组首字符过滤功能代码

<?php
$array=array(
"abcd",
"abcde",
"bcde",
"cdef",
"defg",
"defgh"
);
$str="~".implode("~",$array)."~";
$word=$_GET["word"];//url=xxx.php?word=a
preg_match_all("/~({$word}(?:[^~]*))/i",$str,$matches);
var_dump($matches[1]);

//输出
//array(2){[0]=>string(4)"abcd"[1]=>string(5)"abcde"}
//End_php