PHP Stripos () functions and considerations of the analysis _php skills

Definitions and usage
The Stripos () function returns the position where the string first appears in another string.

If the string is not found, it returns false.

Grammar
Stripos (String,find,start)

Parameters	Description
String	Necessary. Specify the string to be searched for.
Find	Necessary. Specify the characters to find.
Start	Optional. Specify where to start the search.

Tips and comments
Note: This function is not sensitive to case. For case sensitive searches, use the Strpos () function.
Because this function returns the position where the return string appears for the first time in another string. So this position could be 0.
Then you need to pay attention when the return value is 0.

Copy Code code as follows:

if (Stripos ($r, ' a ') = = False) {

0 is a exists with "always but because 0 and false are equal, so it executes here
}
if (Stripos ($r, ' a ') = = False) {

In this case, we have to use all equals.

}