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
/**
* 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
/**
* 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.
原文链接:https://www.f2er.com/php/528364.htmlNot found based (==) test
Found based (===) test
The (===) test is correct.