摘要：
<?php $username="ginoSin"; #判断参数是否只在a-z范围 if(ereg("([^a-z])",$username)) { echo "username must be all lowercase"; } else { echo "username is all lowercase"; } echo "<br>"; #输出字符参数的长度 echo "the length of $username is:".strlen($usern 阅读全文