PHP没有用于XML安全实体解码的功能?没有一些xml_entity_decode? [英] PHP not have a function for XML-safe entity decode? Not have some xml_entity_decode?
问题描述
问题:我需要一个UTF8完全编码"的XML文件.也就是说，没有实体代表符号，所有符号都由UTF8编码，只有3个XML保留的符号&" (amp)，<" (lt)和>"(gt).而且，我需要一个快速完成的内置功能:将实体转换为真正的UTF8字符(而不破坏XML).
PS:这是一个现实世界中的问题"(！)；例如，在 PMC/journals 中，有280万本科学论文与特殊的XML DTD (也称为 JATS格式)...要处理为常规XML-UTF8文本"，我们需要从数字实体转换为UTF8字符.
尝试的解决方案:此任务的自然功能是A<B.
沮丧的解决方案
我尝试使用html_entity_decode解决(直接！)问题...因此，我将PHP更新到v5.5，以尝试使用ENT_XML1选项，
$s = html_entity_decode($xmlFrag, ENT_XML1, 'UTF-8'); // not working
// as I expected
也许另一个问题是，为什么没有其他选择可以做我期望的事情?" –这对许多其他XML应用程序(！)来说很重要，不仅对我而言. >
我不需要解决方法作为答案...好吧，我展示了我的丑陋函数，也许它可以帮助您理解问题，
function xml_entity_decode($s) {
// here an illustration (by user-defined function)
// about how the hypothetical PHP-build-in-function MUST work
static $XENTITIES = array('&','>','<');
static $XSAFENTITIES = array('#_x_amp#;','#_x_gt#;','#_x_lt#;');
$s = str_replace($XENTITIES,$XSAFENTITIES,$s);
//$s = html_entity_decode($s, ENT_NOQUOTES, 'UTF-8'); // any php version
$s = html_entity_decode($s, ENT_HTML5|ENT_NOQUOTES, 'UTF-8'); // PHP 5.3+
$s = str_replace($XSAFENTITIES,$XENTITIES,$s);
return $s;
} // you see? not need a benchmark:
// it is not so fast as direct use of html_entity_decode; if there
// was an XML-safe option was ideal.
PS:在此答案之后已更正.必须为ENT_HTML5标志，才能转换真正的所有命名实体.
此问题有时会创建一个错误答案"(请参阅答案).这可能是因为人们没有注意，并且是因为没有答案:缺少PHP内置解决方案.
...所以，让我重复解决方法(不是答案！)，以免造成更多混乱:
最佳解决方法
注意:
- 下方的功能
xml_entity_decode()是最佳的解决方法(优于其他方法). - 下面的功能不是当前问题的答案，这只是一种解决方法.
function xml_entity_decode($s) {
// illustrating how a (hypothetical) PHP-build-in-function MUST work
static $XENTITIES = array('&','>','<');
static $XSAFENTITIES = array('#_x_amp#;','#_x_gt#;','#_x_lt#;');
$s = str_replace($XENTITIES,$XSAFENTITIES,$s);
$s = html_entity_decode($s, ENT_HTML5|ENT_NOQUOTES, 'UTF-8'); // PHP 5.3+
$s = str_replace($XSAFENTITIES,$XENTITIES,$s);
return $s;
}
要测试并证明您有更好的解决方案，请首先使用以下简单的beckckmark进行测试:
$countBchMk_MAX=1000;
$xml = file_get_contents('sample1.xml'); // BIG and complex XML string
$start_time = microtime(TRUE);
for($countBchMk=0; $countBchMk<$countBchMk_MAX; $countBchMk++){
$A = xml_entity_decode($xml); // 0.0002
/* 0.0014
$doc = new DOMDocument;
$doc->loadXML($xml, LIBXML_DTDLOAD | LIBXML_NOENT);
$doc->encoding = 'UTF-8';
$A = $doc->saveXML();
*/
}
$end_time = microtime(TRUE);
echo "\n<h1>END $countBchMk_MAX BENCKMARKs WITH ",
($end_time - $start_time)/$countBchMk_MAX,
" seconds</h1>";
THE PROBLEM: I need a XML file "full encoded" by UTF8; that is, with no entity representing symbols, all symbols enconded by UTF8, except the only 3 ones that are XML-reserved, "&" (amp), "<" (lt) and ">" (gt). And, I need a build-in function that do it fast: to transform entities into real UTF8 characters (without corrupting my XML).
PS: it is a "real world problem" (!); at PMC/journals, for example, have 2.8 MILLION of scientific articles enconded with a special XML DTD (knowed also as JATS format)... To process as "usual XML-UTF8-text" we need to change from numeric entity to UTF8 char.
THE ATTEMPTED SOLUTION: the natural function to this task is html_entity_decode, but it destroys the XML code (!), transforming the reserved 3 XML-reserved symbols.
Illustrating the problem
Suppose
$xmlFrag ='<p>Hello world!    Let A<B and A=∬dxdy</p>';
Where the entities 160 (nbsp) and x222C (double integral) must be transformed into UTF8, and the XML-reserved lt not. The XML text will be (after transformed),
$xmlFrag = '<p>Hello world! Let A<B and A=∬dxdy</p>';
The text "A<B" needs an XML-reserved character, so MUST stay as A<B.
Frustrated solutions
I try to use html_entity_decode for solve (directly!) the problem... So, I updated my PHP to v5.5 to try to use the ENT_XML1 option,
$s = html_entity_decode($xmlFrag, ENT_XML1, 'UTF-8'); // not working
// as I expected
Perhaps another question is, "WHY there are no other option to do what I expected?" -- it is important for many other XML applications (!), not only for me.
I not need a workaround as answer... Ok, I show my ugly function, perhaps it helps you to understand the problem,
function xml_entity_decode($s) {
// here an illustration (by user-defined function)
// about how the hypothetical PHP-build-in-function MUST work
static $XENTITIES = array('&','>','<');
static $XSAFENTITIES = array('#_x_amp#;','#_x_gt#;','#_x_lt#;');
$s = str_replace($XENTITIES,$XSAFENTITIES,$s);
//$s = html_entity_decode($s, ENT_NOQUOTES, 'UTF-8'); // any php version
$s = html_entity_decode($s, ENT_HTML5|ENT_NOQUOTES, 'UTF-8'); // PHP 5.3+
$s = str_replace($XSAFENTITIES,$XENTITIES,$s);
return $s;
} // you see? not need a benchmark:
// it is not so fast as direct use of html_entity_decode; if there
// was an XML-safe option was ideal.
PS: corrected after this answer. Must be ENT_HTML5 flag, for convert really all named entities.
This question is creating, time-by-time, a "false answer" (see answers). This is perhaps because people not pay attention, and because there are NO ANSWER: there are a lack of PHP build-in solution.
... So, lets repeat my workaround (that is NOT an answer!) to not create more confusion:
The best workaround
Pay attention:
- The function
xml_entity_decode()below is the best (over any other) workaround. - The function below is not an answer to the present question, it is only a workwaround.
function xml_entity_decode($s) {
// illustrating how a (hypothetical) PHP-build-in-function MUST work
static $XENTITIES = array('&','>','<');
static $XSAFENTITIES = array('#_x_amp#;','#_x_gt#;','#_x_lt#;');
$s = str_replace($XENTITIES,$XSAFENTITIES,$s);
$s = html_entity_decode($s, ENT_HTML5|ENT_NOQUOTES, 'UTF-8'); // PHP 5.3+
$s = str_replace($XSAFENTITIES,$XENTITIES,$s);
return $s;
}
To test and to demonstrate that you have a better solution, please test first with this simple benckmark:
$countBchMk_MAX=1000;
$xml = file_get_contents('sample1.xml'); // BIG and complex XML string
$start_time = microtime(TRUE);
for($countBchMk=0; $countBchMk<$countBchMk_MAX; $countBchMk++){
$A = xml_entity_decode($xml); // 0.0002
/* 0.0014
$doc = new DOMDocument;
$doc->loadXML($xml, LIBXML_DTDLOAD | LIBXML_NOENT);
$doc->encoding = 'UTF-8';
$A = $doc->saveXML();
*/
}
$end_time = microtime(TRUE);
echo "\n<h1>END $countBchMk_MAX BENCKMARKs WITH ",
($end_time - $start_time)/$countBchMk_MAX,
" seconds</h1>";
这篇关于PHP没有用于XML安全实体解码的功能?没有一些xml_entity_decode?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
