<?php

    $first = "abc";

    $second = "aBc";

    if(strcmp($first, $second) == )//字串比较

    {

        print("字符串相等:"."<hr>");

    }

    else

    {

        print("字符串不相等"."<hr>");

    }

    print("abcde我是中国人: ".strlen("abcde我是中国人")."<hr>");//字串长度

    $text = "hello world";

    print(strpos($text, "w")."<hr>");//寻找字串中某字元最先出现处

?>