note 43381 added to function.strtok

<pre><?php /** get leading, trailing, and embedded separator tokens that were 'skipped' if for some ungodly reason you are using php to implement a simple parser that needs to detect nested clauses as it builds a parse tree */ $str = "(((alpha(beta))(gamma))"; $seps = '()'; $tok = strtok( $str,$seps ); // return false on empty string or null $cur = 0; $dumbDone = FALSE; $done = (FALSE===$tok); while (!$done) { // process skipped tokens (if any at first iteration) (special for last) $posTok = $dumbDone ? strlen($str) : strpos($str, $tok, $cur ); $skippedMany = substr( $str, $cur, $posTok-$cur ); // false when 0 width $lenSkipped = strlen($skippedMany); // 0 when false if (0!==$lenSkipped) { $last = strlen($skippedMany) -1; for($i=0; $i<=$last; $i++){ $skipped = $skippedMany[$i]; $cur += strlen($skipped); echo "skipped: $skipped\n"; } } if ($dumbDone) break; // this is the only place the loop is terminated // process current tok echo "curr tok: ".$tok."\n"; // update cursor $cur += strlen($tok); // get any next tok if (!$dumbDone){ $tok = strtok($seps); $dumbDone = (FALSE===$tok); // you're not really done till you check for trailing skipped } }; ?></pre> ---- Manual Page -- http://www.php.net/manual/en/function.strtok.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+43381 Delete -- http://master.php.net/manage/user-notes.php?action=delete+43381&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+43381&report=yes Search -- http://master.php.net/manage/user-notes.php