supported as $idx => $ext) { if (!in_array($ext, $capabilities)) { unset($this->supported[$idx]); } } } // Parse text content of the script $this->_parse_text($script); } /** * Adds rule to the script (at the end) * * @param string Rule name * @param array Rule content (as array) * * @return int The index of the new rule */ public function add_rule($content) { // TODO: check this->supported array_push($this->content, $content); return sizeof($this->content)-1; } public function delete_rule($index) { if(isset($this->content[$index])) { unset($this->content[$index]); return true; } return false; } public function size() { return sizeof($this->content); } public function update_rule($index, $content) { // TODO: check this->supported if ($this->content[$index]) { $this->content[$index] = $content; return $index; } return false; } /** * Sets "global" variable * * @param string $name Variable name * @param string $value Variable value * @param array $mods Variable modifiers */ public function set_var($name, $value, $mods = array()) { // Check if variable exists for ($i=0, $len=count($this->vars); $i<$len; $i++) { if ($this->vars[$i]['name'] == $name) { break; } } $var = array_merge($mods, array('name' => $name, 'value' => $value)); $this->vars[$i] = $var; } /** * Unsets "global" variable * * @param string $name Variable name */ public function unset_var($name) { // Check if variable exists foreach ($this->vars as $idx => $var) { if ($var['name'] == $name) { unset($this->vars[$idx]); break; } } } /** * Gets the value of "global" variable * * @param string $name Variable name * * @return string Variable value */ public function get_var($name) { // Check if variable exists for ($i=0, $len=count($this->vars); $i<$len; $i++) { if ($this->vars[$i]['name'] == $name) { return $this->vars[$i]['name']; } } } /** * Sets script header content * * @param string $text Header content */ public function set_prefix($text) { $this->prefix = $text; } /** * Returns script as text */ public function as_text() { $output = ''; $exts = array(); $idx = 0; if (!empty($this->vars)) { if (in_array('variables', (array)$this->supported)) { $has_vars = true; array_push($exts, 'variables'); } foreach ($this->vars as $var) { if (empty($has_vars)) { // 'variables' extension not supported, put vars in comments $output .= sprintf("# %s %s\n", $var['name'], $var['value']); } else { $output .= 'set '; foreach (array_diff(array_keys($var), array('name', 'value')) as $opt) { $output .= ":$opt "; } $output .= self::escape_string($var['name']) . ' ' . self::escape_string($var['value']) . ";\n"; } } } $imapflags = in_array('imap4flags', $this->supported) ? 'imap4flags' : 'imapflags'; $notify = in_array('enotify', $this->supported) ? 'enotify' : 'notify'; // rules foreach ($this->content as $rule) { $script = ''; $tests = array(); $i = 0; // header if (!empty($rule['name']) && strlen($rule['name'])) { $script .= '# rule:[' . $rule['name'] . "]\n"; } // constraints expressions if (!empty($rule['tests'])) { foreach ($rule['tests'] as $test) { $tests[$i] = ''; switch ($test['test']) { case 'size': $tests[$i] .= ($test['not'] ? 'not ' : ''); $tests[$i] .= 'size :' . ($test['type']=='under' ? 'under ' : 'over ') . $test['arg']; break; case 'true': $tests[$i] .= ($test['not'] ? 'false' : 'true'); break; case 'exists': $tests[$i] .= ($test['not'] ? 'not ' : ''); $tests[$i] .= 'exists ' . self::escape_string($test['arg']); break; case 'header': $tests[$i] .= ($test['not'] ? 'not ' : ''); $tests[$i] .= 'header'; $this->add_index($test, $tests[$i], $exts); $this->add_operator($test, $tests[$i], $exts); $tests[$i] .= ' ' . self::escape_string($test['arg1']); $tests[$i] .= ' ' . self::escape_string($test['arg2']); break; case 'address': case 'envelope': if ($test['test'] == 'envelope') { array_push($exts, 'envelope'); } $tests[$i] .= ($test['not'] ? 'not ' : ''); $tests[$i] .= $test['test']; if ($test['test'] != 'envelope') { $this->add_index($test, $tests[$i], $exts); } // :all address-part is optional, skip it if (!empty($test['part']) && $test['part'] != 'all') { $tests[$i] .= ' :' . $test['part']; if ($test['part'] == 'user' || $test['part'] == 'detail') { array_push($exts, 'subaddress'); } } $this->add_operator($test, $tests[$i], $exts); $tests[$i] .= ' ' . self::escape_string($test['arg1']); $tests[$i] .= ' ' . self::escape_string($test['arg2']); break; case 'body': array_push($exts, 'body'); $tests[$i] .= ($test['not'] ? 'not ' : '') . 'body'; if (!empty($test['part'])) { $tests[$i] .= ' :' . $test['part']; if (!empty($test['content']) && $test['part'] == 'content') { $tests[$i] .= ' ' . self::escape_string($test['content']); } } $this->add_operator($test, $tests[$i], $exts); $tests[$i] .= ' ' . self::escape_string($test['arg']); break; case 'date': case 'currentdate': array_push($exts, 'date'); $tests[$i] .= ($test['not'] ? 'not ' : '') . $test['test']; $this->add_index($test, $tests[$i], $exts); if (!empty($test['originalzone']) && $test['test'] == 'date') { $tests[$i] .= ' :originalzone'; } else if (!empty($test['zone'])) { $tests[$i] .= ' :zone ' . self::escape_string($test['zone']); } $this->add_operator($test, $tests[$i], $exts); if ($test['test'] == 'date') { $tests[$i] .= ' ' . self::escape_string($test['header']); } $tests[$i] .= ' ' . self::escape_string($test['part']); $tests[$i] .= ' ' . self::escape_string($test['arg']); break; } $i++; } } // disabled rule: if false #.... if (!empty($tests)) { $script .= 'if ' . ($rule['disabled'] ? 'false # ' : ''); if (count($tests) > 1) { $tests_str = implode(', ', $tests); } else { $tests_str = $tests[0]; } if ($rule['join'] || count($tests) > 1) { $script .= sprintf('%s (%s)', $rule['join'] ? 'allof' : 'anyof', $tests_str); } else { $script .= $tests_str; } $script .= "\n{\n"; } // action(s) if (!empty($rule['actions'])) { foreach ($rule['actions'] as $action) { $action_script = ''; switch ($action['type']) { case 'fileinto': array_push($exts, 'fileinto'); $action_script .= 'fileinto '; if ($action['copy']) { $action_script .= ':copy '; array_push($exts, 'copy'); } $action_script .= self::escape_string($action['target']); break; case 'redirect': $action_script .= 'redirect '; if ($action['copy']) { $action_script .= ':copy '; array_push($exts, 'copy'); } $action_script .= self::escape_string($action['target']); break; case 'reject': case 'ereject': array_push($exts, $action['type']); $action_script .= $action['type'].' ' . self::escape_string($action['target']); break; case 'addflag': case 'setflag': case 'removeflag': array_push($exts, $imapflags); $action_script .= $action['type'].' ' . self::escape_string($action['target']); break; case 'keep': case 'discard': case 'stop': $action_script .= $action['type']; break; case 'include': array_push($exts, 'include'); $action_script .= 'include '; foreach (array_diff(array_keys($action), array('target', 'type')) as $opt) { $action_script .= ":$opt "; } $action_script .= self::escape_string($action['target']); break; case 'set': array_push($exts, 'variables'); $action_script .= 'set '; foreach (array_diff(array_keys($action), array('name', 'value', 'type')) as $opt) { $action_script .= ":$opt "; } $action_script .= self::escape_string($action['name']) . ' ' . self::escape_string($action['value']); break; case 'notify': array_push($exts, $notify); $action_script .= 'notify'; $method = $action['method']; unset($action['method']); $action['options'] = (array) $action['options']; // Here we support draft-martin-sieve-notify-01 used by Cyrus if ($notify == 'notify') { switch ($action['importance']) { case 1: $action_script .= " :high"; break; //case 2: $action_script .= " :normal"; break; case 3: $action_script .= " :low"; break; } // Old-draft way: :method "mailto" :options "email@address" if (!empty($method)) { $parts = explode(':', $method, 2); $action['method'] = $parts[0]; array_unshift($action['options'], $parts[1]); } unset($action['importance']); unset($action['from']); unset($method); } foreach (array('id', 'importance', 'method', 'options', 'from', 'message') as $n_tag) { if (!empty($action[$n_tag])) { $action_script .= " :$n_tag " . self::escape_string($action[$n_tag]); } } if (!empty($method)) { $action_script .= ' ' . self::escape_string($method); } break; case 'vacation': array_push($exts, 'vacation'); $action_script .= 'vacation'; if (isset($action['seconds'])) { array_push($exts, 'vacation-seconds'); $action_script .= " :seconds " . intval($action['seconds']); } else if (!empty($action['days'])) { $action_script .= " :days " . intval($action['days']); } if (!empty($action['addresses'])) $action_script .= " :addresses " . self::escape_string($action['addresses']); if (!empty($action['subject'])) $action_script .= " :subject " . self::escape_string($action['subject']); if (!empty($action['handle'])) $action_script .= " :handle " . self::escape_string($action['handle']); if (!empty($action['from'])) $action_script .= " :from " . self::escape_string($action['from']); if (!empty($action['mime'])) $action_script .= " :mime"; $action_script .= " " . self::escape_string($action['reason']); break; } if ($action_script) { $script .= !empty($tests) ? "\t" : ''; $script .= $action_script . ";\n"; } } } if ($script) { $output .= $script . (!empty($tests) ? "}\n" : ''); $idx++; } } // requires if (!empty($exts)) { $exts = array_unique($exts); if (in_array('vacation-seconds', $exts) && ($key = array_search('vacation', $exts)) !== false) { unset($exts[$key]); } sort($exts); // for convenience use always the same order $output = 'require ["' . implode('","', $exts) . "\"];\n" . $output; } if (!empty($this->prefix)) { $output = $this->prefix . "\n\n" . $output; } return $output; } /** * Returns script object * */ public function as_array() { return $this->content; } /** * Returns array of supported extensions * */ public function get_extensions() { return array_values($this->supported); } /** * Converts text script to rules array * * @param string Text script */ private function _parse_text($script) { $prefix = ''; $options = array(); $position = 0; $length = strlen($script); while ($position < $length) { // skip whitespace chars $position = self::ltrim_position($script, $position); $rulename = ''; // Comments while ($script[$position] === '#') { $endl = strpos($script, "\n", $position) ?: $length; $line = substr($script, $position, $endl - $position); // Roundcube format if (preg_match('/^# rule:\[(.*)\]/', $line, $matches)) { $rulename = $matches[1]; } // KEP:14 variables else if (preg_match('/^# (EDITOR|EDITOR_VERSION) (.+)$/', $line, $matches)) { $this->set_var($matches[1], $matches[2]); } // Horde-Ingo format else if (!empty($options['format']) && $options['format'] == 'INGO' && preg_match('/^# (.*)/', $line, $matches) ) { $rulename = $matches[1]; } else if (empty($options['prefix'])) { $prefix .= $line . "\n"; } $position = $endl + 1; } // handle script header if (empty($options['prefix'])) { $options['prefix'] = true; if ($prefix && strpos($prefix, 'horde.org/ingo')) { $options['format'] = 'INGO'; } } // Control structures/blocks if (preg_match('/^(if|else|elsif)/i', substr($script, $position, 5))) { $rule = $this->_tokenize_rule($script, $position); if (strlen($rulename) && !empty($rule)) { $rule['name'] = $rulename; } } // Simple commands else { $rule = $this->_parse_actions($script, $position, ';'); if (!empty($rule[0]) && is_array($rule)) { // set "global" variables if ($rule[0]['type'] == 'set') { unset($rule[0]['type']); $this->vars[] = $rule[0]; unset($rule); } else { $rule = array('actions' => $rule); } } } if (!empty($rule)) { $this->content[] = $rule; } } if (!empty($prefix)) { $this->prefix = trim($prefix); } } /** * Convert text script fragment to rule object * * @param string $content The whole script content * @param int &$position Start position in the script * * @return array Rule data */ private function _tokenize_rule($content, &$position) { $cond = strtolower(self::tokenize($content, 1, $position)); if ($cond != 'if' && $cond != 'elsif' && $cond != 'else') { return null; } $disabled = false; $join = false; $join_not = false; $length = strlen($content); // disabled rule (false + comment): if false # ..... if (preg_match('/^\s*false\s+#\s*/i', substr($content, $position, 20), $m)) { $position += strlen($m[0]); $disabled = true; } while ($position < $length) { $tokens = self::tokenize($content, true, $position); $separator = array_pop($tokens); if (!empty($tokens)) { $token = array_shift($tokens); } else { $token = $separator; } $token = strtolower($token); if ($token == 'not') { $not = true; $token = strtolower(array_shift($tokens)); } else { $not = false; } // we support "not allof" as a negation of allof sub-tests if ($join_not) { $not = !$not; } switch ($token) { case 'allof': $join = true; $join_not = $not; break; case 'anyof': break; case 'size': $test = array('test' => 'size', 'not' => $not); $test['arg'] = array_pop($tokens); for ($i=0, $len=count($tokens); $i<$len; $i++) { if (!is_array($tokens[$i]) && preg_match('/^:(under|over)$/i', $tokens[$i]) ) { $test['type'] = strtolower(substr($tokens[$i], 1)); } } $tests[] = $test; break; case 'header': case 'address': case 'envelope': $test = array('test' => $token, 'not' => $not); $test['arg2'] = array_pop($tokens); $test['arg1'] = array_pop($tokens); $test += $this->test_tokens($tokens); if ($token != 'header' && !empty($tokens)) { for ($i=0, $len=count($tokens); $i<$len; $i++) { if (!is_array($tokens[$i]) && preg_match('/^:(localpart|domain|all|user|detail)$/i', $tokens[$i])) { $test['part'] = strtolower(substr($tokens[$i], 1)); } } } $tests[] = $test; break; case 'body': $test = array('test' => 'body', 'not' => $not); $test['arg'] = array_pop($tokens); $test += $this->test_tokens($tokens); for ($i=0, $len=count($tokens); $i<$len; $i++) { if (!is_array($tokens[$i]) && preg_match('/^:(raw|content|text)$/i', $tokens[$i])) { $test['part'] = strtolower(substr($tokens[$i], 1)); if ($test['part'] == 'content') { $test['content'] = $tokens[++$i]; } } } $tests[] = $test; break; case 'date': case 'currentdate': $test = array('test' => $token, 'not' => $not); $test['arg'] = array_pop($tokens); $test['part'] = array_pop($tokens); if ($token == 'date') { $test['header'] = array_pop($tokens); } $test += $this->test_tokens($tokens); for ($i=0, $len=count($tokens); $i<$len; $i++) { if (!is_array($tokens[$i]) && preg_match('/^:zone$/i', $tokens[$i])) { $test['zone'] = $tokens[++$i]; } else if (!is_array($tokens[$i]) && preg_match('/^:originalzone$/i', $tokens[$i])) { $test['originalzone'] = true; } } $tests[] = $test; break; case 'exists': $tests[] = array('test' => 'exists', 'not' => $not, 'arg' => array_pop($tokens)); break; case 'true': $tests[] = array('test' => 'true', 'not' => $not); break; case 'false': $tests[] = array('test' => 'true', 'not' => !$not); break; } // goto actions... if ($separator == '{') { break; } } // ...and actions block $actions = $this->_parse_actions($content, $position); if ($tests && $actions) { $result = array( 'type' => $cond, 'tests' => $tests, 'actions' => $actions, 'join' => $join, 'disabled' => $disabled, ); } return $result; } /** * Parse body of actions section * * @param string $content The whole script content * @param int &$position Start position in the script * @param string $end End of text separator * * @return array Array of parsed action type/target pairs */ private function _parse_actions($content, &$position, $end = '}') { $result = null; $length = strlen($content); while ($position < $length) { $tokens = self::tokenize($content, true, $position); $separator = array_pop($tokens); $token = !empty($tokens) ? array_shift($tokens) : $separator; switch ($token) { case 'discard': case 'keep': case 'stop': $result[] = array('type' => $token); break; case 'fileinto': case 'redirect': $action = array('type' => $token, 'target' => array_pop($tokens)); $args = array('copy'); $action += $this->action_arguments($tokens, $args); $result[] = $action; break; case 'vacation': $action = array('type' => 'vacation', 'reason' => array_pop($tokens)); $args = array('mime'); $vargs = array('seconds', 'days', 'addresses', 'subject', 'handle', 'from'); $action += $this->action_arguments($tokens, $args, $vargs); $result[] = $action; break; case 'reject': case 'ereject': case 'setflag': case 'addflag': case 'removeflag': $result[] = array('type' => $token, 'target' => array_pop($tokens)); break; case 'include': $action = array('type' => 'include', 'target' => array_pop($tokens)); $args = array('once', 'optional', 'global', 'personal'); $action += $this->action_arguments($tokens, $args); $result[] = $action; break; case 'set': $action = array('type' => 'set', 'value' => array_pop($tokens), 'name' => array_pop($tokens)); $args = array('lower', 'upper', 'lowerfirst', 'upperfirst', 'quotewildcard', 'length'); $action += $this->action_arguments($tokens, $args); $result[] = $action; break; case 'require': // skip, will be build according to used commands // $result[] = array('type' => 'require', 'target' => array_pop($tokens)); break; case 'notify': $action = array('type' => 'notify'); $priorities = array('high' => 1, 'normal' => 2, 'low' => 3); $vargs = array('from', 'id', 'importance', 'options', 'message', 'method'); $args = array_keys($priorities); $action += $this->action_arguments($tokens, $args, $vargs); // Here we'll convert draft-martin-sieve-notify-01 into RFC 5435 if (!isset($action['importance'])) { foreach ($priorities as $key => $val) { if (isset($action[$key])) { $action['importance'] = $val; unset($action[$key]); } } } $action['options'] = (array) $action['options']; // Old-draft way: :method "mailto" :options "email@address" if (!empty($action['method']) && !empty($action['options'])) { $action['method'] .= ':' . array_shift($action['options']); } // unnamed parameter is a :method in enotify extension else if (!isset($action['method'])) { $action['method'] = array_pop($tokens); } $result[] = $action; break; } if ($separator == $end) break; } return $result; } /** * Add comparator to the test */ private function add_comparator($test, &$out, &$exts) { if (empty($test['comparator'])) { return; } if ($test['comparator'] == 'i;ascii-numeric') { array_push($exts, 'relational'); array_push($exts, 'comparator-i;ascii-numeric'); } else if (!in_array($test['comparator'], array('i;octet', 'i;ascii-casemap'))) { array_push($exts, 'comparator-' . $test['comparator']); } // skip default comparator if ($test['comparator'] != 'i;ascii-casemap') { $out .= ' :comparator ' . self::escape_string($test['comparator']); } } /** * Add index argument to the test */ private function add_index($test, &$out, &$exts) { if (!empty($test['index'])) { array_push($exts, 'index'); $out .= ' :index ' . intval($test['index']) . ($test['last'] ? ' :last' : ''); } } /** * Add operators to the test */ private function add_operator($test, &$out, &$exts) { if (empty($test['type'])) { return; } // relational operator if (preg_match('/^(value|count)-([gteqnl]{2})/', $test['type'], $m)) { array_push($exts, 'relational'); $out .= ' :' . $m[1] . ' "' . $m[2] . '"'; } else { if ($test['type'] == 'regex') { array_push($exts, 'regex'); } $out .= ' :' . $test['type']; } $this->add_comparator($test, $out, $exts); } /** * Extract test tokens */ private function test_tokens(&$tokens) { $test = array(); $result = array(); for ($i=0, $len=count($tokens); $i<$len; $i++) { if (!is_array($tokens[$i]) && $tokens[$i][0] == ':') { if (preg_match('/^:comparator$/i', $tokens[$i])) { $test['comparator'] = $tokens[++$i]; continue; } if (preg_match('/^:(count|value)$/i', $tokens[$i])) { $test['type'] = strtolower(substr($tokens[$i], 1)) . '-' . $tokens[++$i]; continue; } if (preg_match('/^:(is|contains|matches|regex)$/i', $tokens[$i])) { $test['type'] = strtolower(substr($tokens[$i], 1)); continue; } if (preg_match('/^:index$/i', $tokens[$i])) { $test['index'] = intval($tokens[++$i]); if ($tokens[$i+1] && preg_match('/^:last$/i', $tokens[$i+1])) { $test['last'] = true; $i++; } continue; } } $result[] = $tokens[$i]; } $tokens = $result; return $test; } /** * Extract action arguments */ private function action_arguments(&$tokens, $bool_args, $val_args = array()) { $action = array(); $result = array(); for ($i=0, $len=count($tokens); $i<$len; $i++) { $tok = $tokens[$i]; if (!is_array($tok) && $tok[0] == ':') { $tok = strtolower(substr($tok, 1)); if (in_array($tok, $bool_args)) { $action[$tok] = true; } else if (in_array($tok, $val_args)) { $action[$tok] = $tokens[++$i]; } else { $result[] = $tok; } } else { $result[] = $tok; } } $tokens = $result; return $action; } /** * Escape special chars into quoted string value or multi-line string * or list of strings * * @param string $str Text or array (list) of strings * * @return string Result text */ static function escape_string($str) { if (is_array($str) && count($str) > 1) { foreach($str as $idx => $val) $str[$idx] = self::escape_string($val); return '[' . implode(',', $str) . ']'; } else if (is_array($str)) { $str = array_pop($str); } // multi-line string if (preg_match('/[\r\n\0]/', $str) || strlen($str) > 1024) { return sprintf("text:\n%s\n.\n", self::escape_multiline_string($str)); } // quoted-string else { return '"' . addcslashes($str, '\\"') . '"'; } } /** * Escape special chars in multi-line string value * * @param string $str Text * * @return string Text */ static function escape_multiline_string($str) { $str = preg_split('/(\r?\n)/', $str, -1, PREG_SPLIT_DELIM_CAPTURE); foreach ($str as $idx => $line) { // dot-stuffing if (isset($line[0]) && $line[0] == '.') { $str[$idx] = '.' . $line; } } return implode($str); } /** * Splits script into string tokens * * @param string $str The script * @param mixed $num Number of tokens to return, 0 for all * or True for all tokens until separator is found. * Separator will be returned as last token. * @param int &$position Parsing start position * * @return mixed Tokens array or string if $num=1 */ static function tokenize($str, $num = 0, &$position = 0) { $result = array(); $length = strlen($str); $mask = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789:_'; // remove spaces from the beginning of the string while ($position < $length && (!$num || $num === true || count($result) < $num)) { // skip whitespace chars $position = self::ltrim_position($str, $position); switch ($str[$position]) { // Quoted string case '"': for ($pos = $position + 1; $pos < $length; $pos++) { if ($str[$pos] == '"') { break; } if ($str[$pos] == "\\") { if ($str[$pos + 1] == '"' || $str[$pos + 1] == "\\") { $pos++; } } } if ($str[$pos] != '"') { // error } // we need to strip slashes for a quoted string $result[] = stripslashes(substr($str, $position + 1, $pos - $position - 1)); $position = $pos + 1; break; // Parenthesized list case '[': $position++; $result[] = self::tokenize($str, 0, $position); break; case ']': $position++; return $result; break; // list/test separator case ',': // command separator case ';': // block/tests-list case '(': case ')': case '{': case '}': $sep = $str[$position]; $position++; if ($num === true) { $result[] = $sep; break 2; } break; // bracket-comment case '/': if ($str[$position + 1] == '*') { if ($end_pos = strpos($str, '*/', $position + 2)) { $position = $end_pos + 2; } else { // error $position = $length; } } break; // hash-comment case '#': if ($lf_pos = strpos($str, "\n", $position)) { $position = $lf_pos + 1; break; } else { $position = $length; } // String atom default: // empty or one character if ($position == $length) { break 2; } // tag/identifier/number if ($len = strspn($str, $mask, $position)) { $atom = substr($str, $position, $len); $position += $len; if ($atom != 'text:') { $result[] = $atom; } // multiline string else { // skip whitespace chars (except \r\n) $position = self::ltrim_position($str, $position, false); // possible hash-comment after "text:" if ($str[$position] === '#') { $endl = strpos($str, "\n", $position); $position = $endl ?: $length; } // skip \n or \r\n if ($str[$position] == "\n") { $position++; } else if ($str[$position] == "\r" && $str[$position] == "\n") { $position += 2; } $text = ''; // get text until alone dot in a line while ($position < $length) { $pos = strpos($str, "\n.", $position); if ($pos === false) { break; } $text .= substr($str, $position, $pos - $position); $position = $pos + 2; if ($str[$pos] == "\n" || ($str[$pos] == "\r" && $str[$pos + 1] == "\n") ) { break; } } // remove dot-stuffing $text = str_replace("\n..", "\n.", $text); $result[] = $text; $position++; } } // fallback, skip one character as infinite loop prevention else { $position++; } break; } } return $num === 1 ? (isset($result[0]) ? $result[0] : null) : $result; } /** * Skip whitespace characters in a string from specified position. */ static function ltrim_position($content, $position, $br = true) { $blanks = array("\t", "\0", "\x0B", " "); if ($br) { $blanks[] = "\r"; $blanks[] = "\n"; } while (isset($content[$position]) && isset($content[$position + 1]) && in_array($content[$position], $blanks, true) ) { $position++; } return $position; } }