PHP function stripos() to find the first occurrence of a string in another string

Example

Find the first occurrence of "php" in the string:

<?php
echo stripos("I love php, I love php too!","PHP");
?>

Definition and usage

stripos() Function finds the first occurrence of a string within another string (case-insensitive).

Note: The stripos() function is not case-sensitive.

Note: This function is binary safe.

Related functions:

• strripos() - Find the last occurrence of a string in another string (case-insensitive )

• strpos() - Find the first occurrence of a string in another string (case sensitive)

• strrpos() - Find the last occurrence of a string in another string (case sensitive)

Syntax

stripos(string,find,start)

Technical details

Note: This function has Writing is insensitive. For case-sensitive searches, use the strpos() function.
Since this function returns the position of the first occurrence of the returned string in another string. So this position may be 0
Then you need to pay attention when the return value is 0

if(stripos($r, 'a') == false) {
       //0是a存在与$r总但是由于0和false是相等的，所以就执行了这里
}
if(stripos($r, 'a') === false) {
     // 这种情况我们必须使用全等于才行
}

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