<?php
    $first = "abc";
    $second = "aBc";
    if(strcmp($first, $second) == 0)//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
?>