note 102336 deleted from function.strpos by levim

Note Submitter: jaimthorn at yahoo dot com ---- A complete set of strn*pos functions that look for the nth occurrence of the needle in the haystack. I prefer this implementation of strnpos because it doesn't give visible warnings when supplied with a needle of length 0 (which is, admittedly, non-standard behavior). Based on a version I [originally posted on 05-MAR-2010]; this new version conforms more to the semantics of strpos. <?php /** * This function implements all the strn*pos functions, which return the $nth occurrence of $needle * in $haystack, or false if it doesn't exist / when illegal parameters have been supplied. * * @param string $haystack the string to search in. * @param MIXED $needle the string or the ASCII value of the character to search for. * @param integer $nth the number of the occurrence to look for. * @param integer $offset the position in $haystack to start looking for $needle. * @param bool $insensitive should the function be case insensitive? * @param bool $reverse should the function work its way backwards in the haystack? * @return MIXED integer either the position of the $nth occurrence of $needle in $haystack, * or boolean false if it can't be found. */ function strnripos_generic( $haystack, $needle, $nth, $offset, $insensitive, $reverse ) { // If needle is not a string, it is converted to an integer and applied as the ordinal value of a character. if( ! is_string( $needle ) ) { $needle = chr( (int) $needle ); } // Are the supplied values valid / reasonable? $len = strlen( $needle ); if( 1 > $nth || 0 === $len ) { return false; } if( $insensitive ) { $haystack = strtolower( $haystack ); $needle = strtolower( $needle ); } if( $reverse ) { $haystack = strrev( $haystack ); $needle = strrev( $needle ); } // $offset is incremented in the call to strpos, so make sure that the first // call starts at the right position by initially decreasing $offset by $len. $offset -= $len; do { $offset = strpos( $haystack, $needle, $offset + $len ); } while( --$nth && false !== $offset ); return false === $offset || ! $reverse ? $offset : strlen( $haystack ) - $offset; } /** * @see strnripos_generic */ function strnpos( $haystack, $needle, $nth, $offset = 0 ) { return strnripos_generic( $haystack, $needle, $nth, $offset, false, false ); } /** * @see strnripos_generic */ function strnipos( $haystack, $needle, $nth, $offset = 0 ) { return strnripos_generic( $haystack, $needle, $nth, $offset, true, false ); } /** * @see strnripos_generic */ function strnrpos( $haystack, $needle, $nth, $offset = 0 ) { return strnripos_generic( $haystack, $needle, $nth, $offset, false, true ); } /** * @see strnripos_generic */ function strnripos( $haystack, $needle, $nth, $offset = 0 ) { return strnripos_generic( $haystack, $needle, $nth, $offset, true, true ); } $haystack = 'Dit is een HoTtentotTentenTentenToonstellingTest!'; echo strnpos ( $haystack, 't', 5 ), ' === ', strnpos ( $haystack, 116, 5 ), PHP_EOL; echo strnipos ( $haystack, 't', 5 ), ' === ', strnipos ( $haystack, 116, 5 ), PHP_EOL; echo strnrpos ( $haystack, 't', 5 ), ' === ', strnrpos ( $haystack, 116, 5 ), PHP_EOL; echo strnripos( $haystack, 't', 5 ), ' === ', strnripos( $haystack, 116, 5 ), PHP_EOL; echo PHP_EOL; echo strnpos ( $haystack, 'T', 5 ), ' === ', strnpos ( $haystack, 84, 5 ), PHP_EOL; echo strnipos ( $haystack, 'T', 5 ), ' === ', strnipos ( $haystack, 84, 5 ), PHP_EOL; echo strnrpos ( $haystack, 'T', 5 ), ' === ', strnrpos ( $haystack, 84, 5 ), PHP_EOL; echo strnripos( $haystack, 'T', 5 ), ' === ', strnripos( $haystack, 84, 5 ), PHP_EOL; ?>