php man page for stripos

STRIPOS(3)								 1								STRIPOS(3)

stripos - Find the position of the first occurrence of a case-insensitive substring in a string

SYNOPSIS
       mixed stripos (string  $haystack, string  $needle, [int	$offset])

DESCRIPTION
	Find the numeric position of the first occurrence of $needle in the $haystack string.

	Unlike the strpos(3), stripos(3) is case-insensitive.

PARAMETERS
	      o $haystack
		- The string to search in.

	      o $needle
		-  Note that the $needle may be a string of one or more characters.  If $needle is not a string, it is converted to an integer and
		applied as the ordinal value of a character.

	      o $offset
		- If specified, search will start this number of characters counted from the beginning of the string. Unlike strrpos(3) and strri-
		pos(3), the offset cannot be negative.

RETURN VALUES
	Returns the position of where the needle exists relative to the beginnning of the $haystack string (independent of offset). Also note that
       string positions start at 0, and not 1.

	Returns FALSE if the needle was not found.

       Warning

	      This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on
	      Booleans for more information. Use the === operator for testing the return value of this function.

EXAMPLES
       Example #1

	      stripos(3) examples

	      <?php
	      $findme	 = 'a';
	      $mystring1 = 'xyz';
	      $mystring2 = 'ABC';

	      $pos1 = stripos($mystring1, $findme);
	      $pos2 = stripos($mystring2, $findme);

	      // Nope, 'a' is certainly not in 'xyz'
	      if ($pos1 === false) {
		  echo "The string '$findme' was not found in the string '$mystring1'";
	      }

	      // Note our use of ===.  Simply == would not work as expected
	      // because the position of 'a' is the 0th (first) character.
	      if ($pos2 !== false) {
		  echo "We found '$findme' in '$mystring2' at position $pos2";
	      }
	      ?>

NOTES
       Note

	      This function is binary-safe.

SEE ALSO
       mb_stripos(3), strpos(3), strrpos(3), strripos(3), stristr(3), substr(3), str_ireplace(3).

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