Analysis of PHP stripos() function and precautions_PHP tutorial

定义和用法
stripos() 函数返回字符串在另一个字符串中第一次出现的位置。

如果没有找到该字符串，则返回 false。

语法
stripos(string,find,start)

参数	描述
string	必需。规定被搜索的字符串。
find	必需。规定要查找的字符。
start	可选。规定开始搜索的位置。

Tips and Notes
Note: This function is not case sensitive. For case-sensitive searches, use the strpos() function.
Since this function returns the position of the first occurrence of a string in another string. So this position may be 0
Then you need to pay attention when the return value is 0

Copy the code The code is as follows:

if(stripos($r, 'a') == false) {

                                             //0 is a exists and $r total, but since 0 and false are equal, so it is executed here
}
if(stripos($r, 'a') === false) {

// In this case we must use all equals

}

http://www.bkjia.com/PHPjc/327548.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/327548.htmlTechArticleDefinition and usage The stripos() function returns the position of the first occurrence of a string in another string. If the string is not found, returns false. Syntax stripos(string,find,st...