Function to convert PHP array to Apple plist XML or text format

<?PHP
/**
 * PropertyList class
 * Implements writing Apple Property List (.plist) XML and text files from an array.
 *
 * @author Jesus A. Alvarez <zydeco@namedfork.net>
 */
function plist_encode_text ($obj) {
$plist = new PropertyList($obj);
return $plist->text();
}
function plist_encode_xml ($obj) {
$plist = new PropertyList($obj);
return $plist->xml();
}
class PropertyList
{
private $obj, $xml, $text;
public function __construct ($obj) {
$this->obj = $obj;
}
private static function is_assoc ($array) {
return (is_array($array) && 0 !== count(array_diff_key($array, array_keys(array_keys($array)))));
}
public function xml () {
if (isset($this->xml)) return $this->xml;
$x = new XMLWriter();
$x->openMemory();
$x->setIndent(TRUE);
$x->startDocument(&#39;1.0&#39;, &#39;UTF-8&#39;);
$x->writeDTD(&#39;plist&#39;, &#39;-//Apple//DTD PLIST 1.0//EN&#39;, &#39;http://www.apple.com/DTDs/PropertyList-1.0.dtd&#39;);
$x->startElement(&#39;plist&#39;);
$x->writeAttribute(&#39;version&#39;, &#39;1.0&#39;);
$this->xmlWriteValue($x, $this->obj);
$x->endElement(); // plist
$x->endDocument();
$this->xml = $x->outputMemory();
return $this->xml;
}
public function text() {
if (isset($this->text)) return $this->text;
$text = &#39;&#39;;
$this->textWriteValue($text, $this->obj);
$this->text = $text;
return $this->text;
}
private function xmlWriteDict(XMLWriter $x, &$dict) {
$x->startElement(&#39;dict&#39;);
foreach($dict as $k => &$v) {
$x->writeElement(&#39;key&#39;, $k);
$this->xmlWriteValue($x, $v);
}
$x->endElement(); // dict
}
private function xmlWriteArray(XMLWriter $x, &$arr) {
$x->startElement(&#39;array&#39;);
foreach($arr as &$v)
$this->xmlWriteValue($x, $v);
$x->endElement(); // array
}
private function xmlWriteValue(XMLWriter $x, &$v) {
if (is_int($v) || is_long($v))
$x->writeElement(&#39;integer&#39;, $v);
elseif (is_float($v) || is_real($v) || is_double($v))
$x->writeElement(&#39;real&#39;, $v);
elseif (is_string($v))
$x->writeElement(&#39;string&#39;, $v);
elseif (is_bool($v))
$x->writeElement($v?&#39;true&#39;:&#39;false&#39;);
elseif (PropertyList::is_assoc($v))
$this->xmlWriteDict($x, $v);
elseif (is_array($v))
$this->xmlWriteArray($x, $v);
elseif (is_a($v, &#39;PlistData&#39;))
$x->writeElement(&#39;data&#39;, $v->base64EncodedData());
elseif (is_a($v, &#39;PlistDate&#39;))
$x->writeElement(&#39;date&#39;, $v->encodedDate());
else {
trigger_error("Unsupported data type in plist ($v)", E_USER_WARNING);
$x->writeElement(&#39;string&#39;, $v);
}
}
private function textWriteValue(&$text, &$v, $indentLevel = 0) {
if (is_int($v) || is_long($v))
$text .= sprintf("%d", $v);
elseif (is_float($v) || is_real($v) || is_double($v))
$text .= sprintf("%g", $v);
elseif (is_string($v))
$this->textWriteString($text, $v);
elseif (is_bool($v))
$text .= $v?&#39;YES&#39;:&#39;NO&#39;;
elseif (PropertyList::is_assoc($v))
$this->textWriteDict($text, $v, $indentLevel);
elseif (is_array($v))
$this->textWriteArray($text, $v, $indentLevel);
elseif (is_a($v, &#39;PlistData&#39;))
$text .= &#39;<&#39; . $v->hexEncodedData() . &#39;>&#39;;
elseif (is_a($v, &#39;PlistDate&#39;))
$text .= &#39;"&#39; . $v->ISO8601Date() . &#39;"&#39;;
else {
trigger_error("Unsupported data type in plist ($v)", E_USER_WARNING);
$this->textWriteString($text, $v);
}
}
private function textWriteString(&$text, &$str) {
$oldlocale = setlocale(LC_CTYPE, "0");
if (ctype_alnum($str)) $text .= $str;
else $text .= &#39;"&#39; . $this->textEncodeString($str) . &#39;"&#39;;
setlocale(LC_CTYPE, $oldlocale);
}
private function textEncodeString(&$str) {
$newstr = &#39;&#39;;
$i = 0;
$len = strlen($str);
while($i < $len) {
$ch = ord(substr($str, $i, 1));
if ($ch == 0x22 || $ch == 0x5C) {
// escape double quote, backslash
$newstr .= &#39;\\&#39; . chr($ch);
$i++;
} else if ($ch >= 0x07 && $ch <= 0x0D ){
// control characters with escape sequences
$newstr .= &#39;\\&#39; . substr(&#39;abtnvfr&#39;, $ch - 7, 1);
$i++;
} else if ($ch < 32) {
// other non-printable characters escaped as unicode
$newstr .= sprintf(&#39;\U%04x&#39;, $ch);
$i++;
} else if ($ch < 128) {
// ascii printable
$newstr .= chr($ch);
$i++;
} else if ($ch == 192 || $ch == 193) {
// invalid encoding of ASCII characters
$i++;
} else if (($ch & 0xC0) == 0x80){
// part of a lost multibyte sequence, skip
$i++;
} else if (($ch & 0xE0) == 0xC0) {
// U+0080 - U+07FF (2 bytes)
$u = (($ch & 0x1F) << 6) | (ord(substr($str, $i+1, 1)) & 0x3F);
$newstr .= sprintf(&#39;\U%04x&#39;, $u);
$i += 2;
} else if (($ch & 0xF0) == 0xE0) {
// U+0800 - U+FFFF (3 bytes)
$u = (($ch & 0x0F) << 12) | ((ord(substr($str, $i+1, 1)) & 0x3F) << 6) | (ord(substr($str, $i+2, 1)) & 0x3F);
$newstr .= sprintf(&#39;\U%04x&#39;, $u);
$i += 3;
} else if (($ch & 0xF8) == 0xF0) {
// U+10000 - U+3FFFF (4 bytes)
$u = (($ch & 0x07) << 18) | ((ord(substr($str, $i+1, 1)) & 0x3F) << 12) | ((ord(substr($str, $i+2, 1)) & 0x3F) << 6) | (ord(substr($str, $i+3, 1)) & 0x3F);
$newstr .= sprintf(&#39;\U%04x&#39;, $u);
$i += 4;
} else {
// 5 and 6 byte sequences are not valid UTF-8
$i++;
}
}
return $newstr;
}
private function textWriteDict(&$text, &$dict, $indentLevel) {
if (count($dict) == 0) {
$text .= &#39;{}&#39;;
return;
}
$text .= "{\n";
$indent = &#39;&#39;;
$indentLevel++;
while(strlen($indent) < $indentLevel) $indent .= "\t";
foreach($dict as $k => &$v) {
$text .= $indent;
$this->textWriteValue($text, $k);
$text .= &#39; = &#39;;
$this->textWriteValue($text, $v, $indentLevel);
$text .= ";\n";
}
$text .= substr($indent, 0, -1) . &#39;}&#39;;
}
private function textWriteArray(&$text, &$arr, $indentLevel) {
if (count($arr) == 0) {
$text .= &#39;()&#39;;
return;
}
$text .= "(\n";
$indent = &#39;&#39;;
$indentLevel++;
while(strlen($indent) < $indentLevel) $indent .= "\t";
foreach($arr as &$v) {
$text .= $indent;
$this->textWriteValue($text, $v, $indentLevel);
$text .= ",\n";
}
$text .= substr($indent, 0, -1) . &#39;)&#39;;
}
}
class PlistData
{
private $data;
public function __construct($str) {
$this->data = $str;
}
public function base64EncodedData () {
return base64_encode($this->data);
}
public function hexEncodedData () {
$len = strlen($this->data);
$hexstr = &#39;&#39;;
for($i = 0; $i < $len; $i += 4)
$hexstr .= bin2hex(substr($this->data, $i, 4)) . &#39; &#39;;
return substr($hexstr, 0, -1);
}
}
class PlistDate
{
private $dateval;
public function __construct($init = NULL) {
if (is_int($init))
$this->dateval = $init;
elseif (is_string($init))
$this->dateval = strtotime($init);
elseif ($init == NULL)
$this->dateval = time();
}
public function ISO8601Date() {
return gmdate(&#39;Y-m-d\TH:i:s\Z&#39;, $this->dateval);
}
}
?>