note 130538 added to function.strrpos

An example function to show how to iterate through all matches in reverse order: <?php function str_positions_reverse( $haystack, $needle, $fn = null ){ if( $fn === null ) $positions = array(); $needlen = strlen( $needle ); $offset = strlen( $haystack ) + $needlen; $pos = strrpos( $haystack, $needle ); while( $pos !== false ){ if( $fn === null ) $positions[] = $pos; else if( null !== ( $r = $fn( $pos, $haystack, $needle ))) return $r; if( $pos < $needlen ) break; $pos = strrpos( $haystack, $needle, $pos - $offset ); } if( $fn === null ) return $positions; } echo implode(',', str_positions_reverse('111111', '11')); // 4,2,0 echo implode(',', str_positions_reverse('1111111', '11')); // 5,3,1 $path = '/Users//'.get_current_user().'/./Desktop/path/to/a/file.txt'; echo $path; // /Users//alfred.e.neumann/./Desktop/path/to/a/file.txt echo 'slashes: ', implode(',', str_positions_reverse( $path, '/')); // slashes: 44,42,39,34,26,24,7,6,0 echo "\nclosest real file: ", str_positions_reverse( $path, '/', function( $pos, $path ){ $path = realpath( substr( $path, 0, $pos )); if( $path !== false ) return $path; }); // closest real file: /Users/alfred.e.neumann/Desktop ?> ---- Server IP: 45.112.84.4 Probable Submitter: 80.90.5.137 (proxied: 188.143.70.42) ---- Manual Page -- https://php.net/manual/en/function.strrpos.php Edit -- https://main.php.net/note/edit/130538 Del: integrated -- https://main.php.net/note/delete/130538/integrated Del: useless -- https://main.php.net/note/delete/130538/useless Del: bad code -- https://main.php.net/note/delete/130538/bad+code Del: spam -- https://main.php.net/note/delete/130538/spam Del: non-english -- https://main.php.net/note/delete/130538/non-english Del: in docs -- https://main.php.net/note/delete/130538/in+docs Del: other reasons-- https://main.php.net/note/delete/130538 Reject -- https://main.php.net/note/reject/130538 Search -- https://main.php.net/manage/user-notes.php