您如何使用PHP将名称为
newClass
的类添加到像<a class='abc'>
或<p style=display:block>
这样的开始标签中?newClass
的类添加到像<a class='abc'>
或<p style=display:block>
这样的开始标签中?正则表达式示例:
<?php
function addClass($htmlString = '', $newClass) {
$pattern = '/class="([^"]*)"/';
// class attribute set
if (preg_match($pattern, $htmlString, $matches)) {
$definedClasses = explode(' ', $matches[1]);
if (!in_array($newClass, $definedClasses)) {
$definedClasses[] = $newClass;
$htmlString = str_replace($matches[0], sprintf('class="%s"', implode(' ', $definedClasses)), $htmlString);
}
}
// class attribute not set
else {
$htmlString = preg_replace('/(\<.+\s)/', sprintf('$1class="%s" ', $newClass), $htmlString);
}
return $htmlString;
}
echo addClass('<a class="abc">', 'newClass');
echo addClass('<p style=display:block>', 'newClass');
使用http://php.net/manual/zh/book.dom.php的示例
<?php
function addClass($node = null, $className) {
$result = false;
if (is_string($node)) {
$dom = DOMDocument::loadXml($node);
if ($dom instanceof DOMDocument) {
$definedClasses = explode(' ', $dom->documentElement->getAttribute('class'));
if (!in_array($className, $definedClasses)) {
$dom->documentElement->setAttribute(
'class', $dom->documentElement->getAttribute('class') . ' ' . $className
);
}
$result = $dom->saveXml($dom->documentElement, true);
}
}
elseif ($node instanceof DOMElement) {
// this code repetition, could of course be avoided using some more sophisticated structures
$definedClasses = explode(' ', $node->getAttribute('class'));
if (!in_array($className, $definedClasses)) {
$node->setAttribute('class', $node->getAttribute('class') . ' ' . $className);
}
$result = $node;
}
return $result;
}
// using a string as input
echo addClass('<a class="abc"></a>', 'newClass');
// using a DOMElement as input
$dom = DOMDocument::loadHtml('<div><a id="something"></a></div>');
$xpath = new DOMXPath($dom);
$node = $xpath->query('//*[@id="something"]')->item(0);
if ($node instanceof DOMElement) {
addClass($node, 'newClass');
echo $dom->saveXml($node, true);
}
我故意没有在函数内使用loadHTML
,以避免深入到自动生成的html结构中查找实际给定的$htmlString
。这当然意味着$htmlString
必须是格式良好的。
echo addClass('<a class="abc">', 'newClass');
? - jantimon
class="newClass"
... 您能否澄清您的情况? - deceze