The difference between Strpos (), Stripos (), Strrpos (), Strripos () in PHP

Source: Internet
Author: User




Role:


1. Determine the position of a string in another string





2. Determine if a string contains a string





Strpos ($str, $char), starting on the left, where the character appears, case-sensitive;





Stripos($str, $char), start on the left, where characters appear, are not case sensitive;





Strrpos ($str, $char) start on the right, where characters appear, and are case-sensitive;



Strripos($str, $char) start on the right, where characters appear, not case sensitive;






return value:



If $str contains $char, the corresponding subscript is returned (the subscript starts at 0), otherwise false is returned. However, it is important to note that a string cannot be judged in the following way





if (Stripos ($str, $char)) {}
Because in PHP0==false is true.






The difference between Strpos (), Stripos (), Strrpos (), Strripos () in PHP


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