strpos用来查找一个字符串在另一个字符串中首次出现的位置,strpos区分大小写,如果没有找到则返回false,所以strpos有两种类型的返回值,一种是整形,一种是bool型,开发过程中需要注意
@H_404_2@ /** * PHP通过strpos查找字符串出现位置 * * @param * @arrange 512-笔记网: www.jb51.cc **/ echo strpos("Hello world!","wo"); /*** 来自编程之家 jb51.cc(jb51.cc) ***/结出结果:6 由于strpos有两种类型的返回值,所以在判断是否找到子字符串的的时候最好使用===三个等号进行严格类型的相等比较
@H_404_2@ /** * PHP通过strpos查找字符串出现位置 * * @param * @arrange 512-笔记网: www.jb51.cc **/ $haystack = "needle23423432"; $pos = strpos($haystack,"needle"); if ($pos==false) { print("Not found based (==) test\n"); } else { print("Found based (==) test\n"); } if ($pos===false) { print("Not found based (===) test\n"); } else { print("Found based (===) test\n"); } /*** 来自编程之家 jb51.cc(jb51.cc) ***/上面的代码返回如下结果
This script will print:
Not found based (==) test
Found based (===) test
The (===) test is correct.
Not found based (==) test
Found based (===) test
The (===) test is correct.