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copied!<p>This sounded like a fun challenge, so I coded up a tiny parser :D</p> <pre><code>class JsParserException extends Exception {} function parse_jsobj($str, &$data) { $str = trim($str); if(strlen($str) < 1) return; if($str{0} != '{') { throw new JsParserException('The given string is not a JS object'); } $str = substr($str, 1); /* While we have data, and it's not the end of this dict (the comma is needed for nested dicts) */ while(strlen($str) && $str{0} != '}' && $str{0} != ',') { /* find the key */ if($str{0} == "'" || $str{0} == '"') { /* quoted key */ list($str, $key) = parse_jsdata($str, ':'); } else { $match = null; /* unquoted key */ if(!preg_match('/^\s*[a-zA-z_][a-zA-Z_\d]*\s*:/', $str, $match)) { throw new JsParserException('Invalid key ("'.$str.'")'); } $key = $match[0]; $str = substr($str, strlen($key)); $key = trim(substr($key, 0, -1)); /* discard the ':' */ } list($str, $data[$key]) = parse_jsdata($str, '}'); } "Finshed dict. Str: '$str'\n"; return substr($str, 1); } function comma_or_term_pos($str, $term) { $cpos = strpos($str, ','); $tpos = strpos($str, $term); if($cpos === false && $tpos === false) { throw new JsParserException('unterminated dict or array'); } else if($cpos === false) { return $tpos; } else if($tpos === false) { return $cpos; } return min($tpos, $cpos); } function parse_jsdata($str, $term="}") { $str = trim($str); if(is_numeric($str{0}."0")) { /* a number (int or float) */ $newpos = comma_or_term_pos($str, $term); $num = trim(substr($str, 0, $newpos)); $str = substr($str, $newpos+1); /* discard num and comma */ if(!is_numeric($num)) { throw new JsParserException('OOPSIE while parsing number: "'.$num.'"'); } return array(trim($str), $num+0); } else if($str{0} == '"' || $str{0} == "'") { /* string */ $q = $str{0}; $offset = 1; do { $pos = strpos($str, $q, $offset); $offset = $pos; } while($str{$pos-1} == '\\'); /* find un-escaped quote */ $data = substr($str, 1, $pos-1); $str = substr($str, $pos); $pos = comma_or_term_pos($str, $term); $str = substr($str, $pos+1); return array(trim($str), $data); } else if($str{0} == '{') { /* dict */ $data = array(); $str = parse_jsobj($str, $data); return array($str, $data); } else if($str{0} == '[') { /* array */ $arr = array(); $str = substr($str, 1); while(strlen($str) && $str{0} != $term && $str{0} != ',') { $val = null; list($str, $val) = parse_jsdata($str, ']'); $arr[] = $val; $str = trim($str); } $str = trim(substr($str, 1)); return array($str, $arr); } else if(stripos($str, 'true') === 0) { /* true */ $pos = comma_or_term_pos($str, $term); $str = substr($str, $pos+1); /* discard terminator */ return array(trim($str), true); } else if(stripos($str, 'false') === 0) { /* false */ $pos = comma_or_term_pos($str, $term); $str = substr($str, $pos+1); /* discard terminator */ return array(trim($str), false); } else if(stripos($str, 'null') === 0) { /* null */ $pos = comma_or_term_pos($str, $term); $str = substr($str, $pos+1); /* discard terminator */ return array(trim($str), null); } else if(strpos($str, 'undefined') === 0) { /* null */ $pos = comma_or_term_pos($str, $term); $str = substr($str, $pos+1); /* discard terminator */ return array(trim($str), null); } else { throw new JsParserException('Cannot figure out how to parse "'.$str.'" (term is '.$term.')'); } } </code></pre> <p>Usage:</p> <pre><code>$data = '{fu:"bar",baz:["bat"]}'; $parsed = array(); parse_jsobj($data, $parsed); var_export($parsed); </code></pre> <p>Gives:</p> <pre><code>array ( 'fu' => 'bar', 'baz' => array ( 0 => 'bat', ), ) </code></pre> <p>Tested with these strings:</p> <pre><code>'{fu:"bar",baz:["bat"]}', '{rec:{rec:{rec:false}}}', '{foo:[1,2,[3,4]]}', '{fu:{fu:"bar"},bar:{fu:"bar"}}', '{"quoted key":[1,2,3]}', '{und:undefined,"baz":[1,2,"3"]}', '{arr:["a","b"],"baz":"foo","gar":{"faz":false,t:"2"},f:false}', </code></pre>

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