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PHP stripos Examples

Use stripos() to do case insensitive substring matching in PHP.

Important: Use Correct Comparsion Operator!

Only ever compare with the identical operators === / !== and only ever compare with false

Positive match

 if (stripos($str, $substr) !== false) {
      echo("Does match!")

Negative match

 if (stripos($str, $substr) === false) {
      echo("Does not match.")

Check out PHP strpos’ for more details

Search From Offset

If you want to continue a search or want to skip something at the start use an offset as third parameter:

 if (stripos($str, $substr, 5) === false) {

By using the return value of stripos() you can do repeated searches:

 $pos1 = stripos($str, $substr);
 $pos2 = stripos($str, $substr, $pos1 + strlen($pos1));

Searching Backwards

For backwards searching there is another special method strripos() with the same signature:

 if (strripos($str, $substr) === false) {
      echo("Does not match.")