{"id":44,"date":"2025-04-07T19:26:01","date_gmt":"2025-04-07T11:26:01","guid":{"rendered":"https:\/\/www.zhaozhao123.cn\/php\/?p=44"},"modified":"2025-04-07T19:26:01","modified_gmt":"2025-04-07T11:26:01","slug":"%e5%a6%82%e4%bd%95%e5%b0%86domxpath%e8%8e%b7%e5%8f%96%e8%bd%ac%e5%8f%98%e4%b8%ba%e7%b1%bb%e4%bc%bcjquery%e7%9a%84%e8%8e%b7%e5%8f%96%e6%96%b9%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/www.zhaozhao123.cn\/php\/post\/44.html","title":{"rendered":"\u5982\u4f55\u5c06DOMXPath\u83b7\u53d6\u8f6c\u53d8\u4e3a\u7c7b\u4f3cjQuery\u7684\u83b7\u53d6\u65b9\u5f0f"},"content":{"rendered":"\n

\u7b80\u5355\u5b9e\u73b0\u4e00<\/h2>\n\n\n\n

\u5728 PHP \u4e2d\u4f7f\u7528 DOMXPath<\/code> \u8fdb\u884c DOM \u64cd\u4f5c\u65f6\uff0c\u5176\u529f\u80fd\u7c7b\u4f3c\u4e8e jQuery \u7684\u9009\u62e9\u5668\u64cd\u4f5c\uff0c\u4f46\u8bed\u6cd5\u548c\u7528\u6cd5\u4e0a\u5b58\u5728\u660e\u663e\u5dee\u5f02\u3002\u5982\u679c\u4f60\u5e0c\u671b\u5c06 DOMXPath<\/code> \u7684\u83b7\u53d6\u65b9\u5f0f\u8f6c\u53d8\u4e3a\u7c7b\u4f3c jQuery \u7684\u98ce\u683c\uff0c\u53ef\u4ee5\u901a\u8fc7\u5c01\u88c5\u4e00\u4e2a\u7c7b\u6216\u51fd\u6570\u6765\u5b9e\u73b0\u66f4\u7b80\u6d01\u7684\u94fe\u5f0f\u8c03\u7528\u548c\u7c7b\u4f3c jQuery \u7684 API\u3002<\/p>\n\n\n\n

\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u5b9e\u73b0\u601d\u8def\uff1a<\/p>\n\n\n\n

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1. \u5c01\u88c5\u4e00\u4e2a\u7c7b<\/h3>\n\n\n\n

\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5c01\u88c5\u4e00\u4e2a\u7c7b\uff0c\u5c06 DOMDocument<\/code> \u548c DOMXPath<\/code> \u7684\u64cd\u4f5c\u9690\u85cf\u8d77\u6765\uff0c\u5e76\u63d0\u4f9b\u7c7b\u4f3c jQuery \u7684\u65b9\u6cd5\u540d\u548c\u94fe\u5f0f\u8c03\u7528\u3002<\/p>\n\n\n\n

class Query {\n    private $dom;\n    private $xpath;\n    private $nodes = [];\n\n    public function __construct($html = null) {\n        $this->dom = new DOMDocument();\n        libxml_use_internal_errors(true); \/\/ \u9632\u6b62 HTML \u89e3\u6790\u9519\u8bef\u629b\u51fa\u5f02\u5e38\n        if ($html) {\n            $this->dom->loadHTML($html);\n        }\n        $this->xpath = new DOMXPath($this->dom);\n        libxml_clear_errors();\n    }\n\n    \/\/ \u7c7b\u4f3c jQuery \u7684 find \u65b9\u6cd5\n    public function find($selector) {\n        $this->nodes = $this->xpath->query($selector);\n        return $this; \/\/ \u652f\u6301\u94fe\u5f0f\u8c03\u7528\n    }\n\n    \/\/ \u83b7\u53d6\u6240\u6709\u5339\u914d\u7684\u8282\u70b9\u5185\u5bb9\n    public function text() {\n        $texts = [];\n        foreach ($this->nodes as $node) {\n            $texts[] = $node->nodeValue;\n        }\n        return $texts;\n    }\n\n    \/\/ \u83b7\u53d6\u7b2c\u4e00\u4e2a\u5339\u914d\u8282\u70b9\u7684\u5185\u5bb9\n    public function firstText() {\n        if ($this->nodes->length > 0) {\n            return $this->nodes->item(0)->nodeValue;\n        }\n        return null;\n    }\n\n    \/\/ \u8bbe\u7f6e\u6216\u83b7\u53d6 HTML\n    public function html($newHtml = null) {\n        if ($newHtml !== null) {\n            foreach ($this->nodes as $node) {\n                $fragment = $this->dom->createDocumentFragment();\n                $fragment->appendXML($newHtml);\n                $node->appendChild($fragment);\n            }\n            return $this;\n        }\n        $htmls = [];\n        foreach ($this->nodes as $node) {\n            $htmls[] = $this->dom->saveHTML($node);\n        }\n        return $htmls;\n    }\n\n    \/\/ \u83b7\u53d6\u6240\u6709\u5339\u914d\u7684\u8282\u70b9\u5c5e\u6027\n    public function attr($attribute) {\n        $attrs = [];\n        foreach ($this->nodes as $node) {\n            if ($node->hasAttribute($attribute)) {\n                $attrs[] = $node->getAttribute($attribute);\n            }\n        }\n        return $attrs;\n    }\n\n    \/\/ \u6dfb\u52a0\u65b0\u7684\u8282\u70b9\n    public function append($html) {\n        foreach ($this->nodes as $node) {\n            $fragment = $this->dom->createDocumentFragment();\n            $fragment->appendXML($html);\n            $node->appendChild($fragment);\n        }\n        return $this;\n    }\n}<\/code><\/pre>\n\n\n\n
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2. \u4f7f\u7528\u793a\u4f8b<\/h3>\n\n\n\n
\u5047\u8bbe\u6211\u4eec\u6709\u4ee5\u4e0b HTML \u5185\u5bb9\uff1a<\/p>\n\n\n\n
$html = <<<HTML\n<html>\n<body>\n    <div class=\"container\">\n        <p id=\"para1\">Hello, World!<\/p>\n        <p id=\"para2\">This is a test.<\/p>\n    <\/div>\n<\/body>\n<\/html>\nHTML;\n\n$query = new Query($html);\n\n\/\/ \u67e5\u627e\u6240\u6709 p \u6807\u7b7e\u5e76\u83b7\u53d6\u5b83\u4eec\u7684\u6587\u672c\u5185\u5bb9\n$texts = $query->find('\/\/p<\/a>')->text();\nprint_r($texts);\n\n\/\/ \u67e5\u627e\u7b2c\u4e00\u4e2a p \u6807\u7b7e\u7684\u6587\u672c\u5185\u5bb9\n$firstText = $query->find('\/\/p<\/a>')->firstText();\necho $firstText;\n\n\/\/ \u83b7\u53d6\u6240\u6709 p \u6807\u7b7e\u7684 HTML\n$htmls = $query->find('\/\/p<\/a>')->html();\nprint_r($htmls);\n\n\/\/ \u4fee\u6539\u7b2c\u4e00\u4e2a p \u6807\u7b7e\u7684\u5185\u5bb9\n$query->find('\/\/p<\/a>[@id=\"para1\"]')->html('<strong>New Content<\/strong>');\n\n\/\/ \u8f93\u51fa\u4fee\u6539\u540e\u7684\u5b8c\u6574 HTML\necho $query->html();<\/code><\/pre>\n\n\n\n
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3. \u7ed3\u679c\u89e3\u91ca<\/h3>\n\n\n\n