我看到了一些答案(比如这一个),但我有一些更复杂的场景,我不知道如何解释。
我基本上有完整的HTML文档。我需要用绝对URL替换每一个相对URL。
来自潜在HTML元素的元素如下所示,也可能是其他情况:
<img src="/relative/url/img.jpg" />
<form action="/">
<form action="/contact-us/">
<a href='/relative/url/'>Note the Single Quote</a>
<img src="//example.com/protocol-relative-img.jpg" />预期产出将是:
// "//example.com/" is ideal, but "http(s)://example.com/" are acceptable
<img src="//example.com/relative/url/img.jpg" />
<form action="//example.com/">
<form action="//example.com/contact-us/">
<a href='//example.com/relative/url/'>Note the Single Quote</a>
<img src="//example.com/protocol-relative-img.jpg" /> <!-- Unmodified -->我不想取代协议相对URL,因为它们已经成为绝对URL。我已经想出了一些可以工作的代码,但我想知道我是否能稍微清理一下,因为它是极其的重复。
但是,我必须考虑src、href和action的单引号和双引号属性值(是否遗漏了任何可以具有相对URL的属性?)同时避免与协议相关的URL。
到目前为止,我的情况如下:
// Make URL replacement protocol relative to not break insecure/secure links
$url = str_replace( array( 'http://', 'https://' ), '//', $url );
// Temporarily Modify Protocol-Relative URLS
$str = str_replace( 'src="//', 'src="::TEMP_REPLACE::', $str );
$str = str_replace( "src='//", "src='::TEMP_REPLACE::", $str );
$str = str_replace( 'href="//', 'href="::TEMP_REPLACE::', $str );
$str = str_replace( "href='//", "href='::TEMP_REPLACE::", $str );
$str = str_replace( 'action="//', 'action="::TEMP_REPLACE::', $str );
$str = str_replace( "action='//", "action='::TEMP_REPLACE::", $str );
// Replace all other Relative URLS
$str = str_replace( 'src="/', 'src="'. $url .'/', $str );
$str = str_replace( "src='/", "src='". $url ."/", $str );
$str = str_replace( 'href="/', 'href="'. $url .'/', $str );
$str = str_replace( "href='/", "href='". $url ."/", $str );
$str = str_replace( 'action="/', 'action="'. $url .'/', $str );
$str = str_replace( "action='/", "action='". $url ."/", $str );
// Change Protocol Relative URLs back
$str = str_replace( 'src="::TEMP_REPLACE::', 'src="//', $str );
$str = str_replace( "src='::TEMP_REPLACE::", "src='//", $str );
$str = str_replace( 'href="::TEMP_REPLACE::', 'href="//', $str );
$str = str_replace( "href='::TEMP_REPLACE::", "href='//", $str );
$str = str_replace( 'action="::TEMP_REPLACE::', 'action="//', $str );
$str = str_replace( "action='::TEMP_REPLACE::", "action='//", $str );我是说,这很管用,但很丑,我在想也许有更好的方法。
发布于 2018-02-17 04:46:44
新答案
如果您真正的html文档是有效的(并且有一个父/包含标记),那么最合适和最可靠的技术就是使用适当的DOM解析器。
下面是如何使用DOMDocument和Xpath来优雅地锁定和替换指定的标记属性:
Code1 -嵌套Xpath查询:(演示)
$domain = '//example.com';
$tagsAndAttributes = [
'img' => 'src',
'form' => 'action',
'a' => 'href'
];
$dom = new DOMDocument;
$dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
$xpath = new DOMXPath($dom);
foreach ($tagsAndAttributes as $tag => $attr) {
foreach ($xpath->query("//{$tag}[not(starts-with(@{$attr}, '//'))]") as $node) {
$node->setAttribute($attr, $domain . $node->getAttribute($attr));
}
}
echo $dom->saveHTML();Code2 -单个Xpath查询w/条件块:(演示)
$domain = '//example.com';
$targets = [
"//img[not(starts-with(@src, '//'))]",
"//form[not(starts-with(@action, '//'))]",
"//a[not(starts-with(@href, '//'))]"
];
$dom = new DOMDocument;
$dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
$xpath = new DOMXPath($dom);
foreach ($xpath->query(implode('|', $targets)) as $node) {
if ($src = $node->getAttribute('src')) {
$node->setAttribute('src', $domain . $src);
} elseif ($action = $node->getAttribute('action')) {
$node->setAttribute('action', $domain . $action);
} else {
$node->setAttribute('href', $domain . $node->getAttribute('href'));
}
}
echo $dom->saveHTML();旧答案:(...regex不是“DOM感知的”,易受意外破坏的影响)
如果我正确地理解了您,您就会想到一个基值,并且您只想将它应用于相对路径。
代码:(演示)
$html=<<<HTML
<img src="/relative/url/img.jpg" />
<form action="/">
<a href='/relative/url/'>Note the Single Quote</a>
<img src="//site.com/protocol-relative-img.jpg" />
HTML;
$base='https://example.com';
echo preg_replace('~(?:src|action|href)=[\'"]\K/(?!/)[^\'"]*~',"$base$0",$html);输出:
<img src="https://example.com/relative/url/img.jpg" />
<form action="https://example.com/">
<a href='https://example.com/relative/url/'>Note the Single Quote</a>
<img src="//site.com/protocol-relative-img.jpg" />模式分解:
~ #Pattern delimiter
(?:src|action|href) #Match: src or action or href
= #Match equal sign
[\'"] #Match single or double quote
\K #Restart fullstring match (discard previously matched characters
/ #Match slash
(?!/) #Negative lookahead (zero-length assertion): must not be a slash immediately after first matched slash
[^\'"]* #Match zero or more non-single/double quote characters
~ #Pattern delimiter发布于 2018-02-17 02:57:49
我认为<base>元素是你要找的.
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base
<base>是<head>中的一个空元素。使用<base href="https://example.com/path/" />将告诉文档中的所有相关URL引用https://example.com/path/而不是父URL
https://stackoverflow.com/questions/48836281
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