PHP string function strpos stripos strrpos strripos

• strpos– find where the string first appears
• stripos– find where strings first appear (case insensitive)
• strrpos– calculates the last occurrence of the specified string in the target string
• Strripos– calculates the location of the last occurrence of the specified string in the target string (case insensitive)

Mixed Strpos (String $haystack, mixed $needle [, int $offset = 0])

return value

Success: Returns the position where the needle exists at the beginning of the haystack string (independent of offset)
Failed: Returns FALSE if needle is not found.

Note

1. The string position is starting at 0, not starting from 1
2. This function may return a Boolean value of false, but it may also return a non-Boolean value that is equivalent to False
   You should use the = = = operator or!== to test the return value of this function

Stripos

Find where strings first appear (case insensitive)

Mixed Stripos (String $haystack, string $needle [, int $offset = 0])

　　

Strrpos

Calculates the last occurrence of the specified string in the target string

Mixed Strrpos string $haystack Mixed $needle $offset = 0])

Note

1. The string position is starting at 0, not starting from 1
2. This function may return a Boolean value of false, but it may also return a non-Boolean value that is equivalent to False
   You should use the = = = operator or!== to test the return value of this function

Strripos

Calculates the location of the last occurrence of the specified string in the target string (case insensitive)

Mixed Strripos (String $haystack, mixed $needle [, int $offset = 0])

　　

PHP string function strpos stripos strrpos strripos