PHP字符串位数截取
PHP字符串前N位截取<?php header('content-type:text/html;charset=utf-8'); $str="欢迎来到Fish's Blog"; echo "原字符串：".$str."<br>"; echo "截取前1位：".mb_substr($str,
PHP字符串前N位截取<?php header('content-type:text/html;charset=utf-8'); $str="欢迎来到Fish's Blog"; echo "原字符串：".$str."<br>"; echo "截取前1位：".mb_substr($str,