{"id":30324,"date":"2023-12-04T20:36:38","date_gmt":"2023-08-16T20:30:51","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8php%e8%bf%9b%e8%a1%8c%e7%bd%91%e7%bb%9c%e7%88%ac%e8%99%ab-2\/"},"modified":"2025-08-12T18:38:24","modified_gmt":"2025-08-12T10:38:24","slug":"%e4%bd%bf%e7%94%a8php%e8%bf%9b%e8%a1%8c%e7%bd%91%e7%bb%9c%e7%88%ac%e8%99%ab-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8php%e8%bf%9b%e8%a1%8c%e7%bd%91%e7%bb%9c%e7%88%ac%e8%99%ab-2\/","title":{"rendered":"\u4f7f\u7528PHP\u8fdb\u884c\u7f51\u7edc\u722c\u866b"},"content":{"rendered":"
$html<\/span> =<\/span> '<html>\r\n    <head>\r\n            <meta content=\"html\u30b9\u30af\u30ec\u30a4\u30d4\u30f3\u30b0 - Qiita\" property=\"og:title\">\r\n            <meta content=\"https:\/\/cdn.qiita.com\/assets\/qiita-fb-2887e7b4aad86fd8c25cea84846f2236.png\" property=\"og:image\">\r\n            <meta content=\"og\u306edescription\" property=\"og:description\">\r\n        <\/head>\r\n    <body>\r\n        <p id=\"first\">\u4e0a<\/p>\r\n        <p id=\"second\">\u4e2d<\/p>\r\n        <p id=\"third\" class=\"test\">\u4e0b<\/p>\r\n        <div>sampleA<\/div>\r\n        <div>\r\n            <p class=\"test\">sampleB<\/p>\r\n        <\/div>\r\n        <div id=\"area\">\r\n            <p>\r\n                <span>sampleC<\/span>\r\n            <\/p>\r\n            <div>sampleD<\/div>\r\n            sampleE\r\n        <\/div>\r\n    <\/body>\r\n<\/html>'<\/span>;<\/span>\r\n\r\n$dom_document<\/span> =<\/span> new<\/span> DOMDocument<\/span>();<\/span>\r\n@<\/span>$dom_document<\/span>-><\/span>loadHTML<\/span>(<\/span>mb_convert_encoding<\/span>(<\/span>$html<\/span>,<\/span> 'HTML-ENTITIES'<\/span>,<\/span> 'UTF-8'<\/span>));<\/span>\r\n$xml_object<\/span> =<\/span> simplexml_import_dom<\/span>(<\/span>$dom_document<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528DOMDocument<\/p>\n
foreach<\/span> (<\/span>$dom_document<\/span>-><\/span>getElementsByTagName<\/span>(<\/span>'p'<\/span>)<\/span> as<\/span> $item<\/span>)<\/span>\r\n{<\/span>\r\n    foreach<\/span> (<\/span>$item<\/span>-><\/span>childNodes<\/span> as<\/span> $node<\/span>)<\/span>\r\n    {<\/span>\r\n        var_dump<\/span>(<\/span>$node<\/span>-><\/span>nodeValue<\/span>,<\/span> $node<\/span>-><\/span>textContent<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528SimpleXMLElement<\/p>\n
\u57fa\u672c<\/p>\n
(<\/span>string<\/span>)<\/span>$xml_object<\/span>-><\/span>body<\/span>-><\/span>p<\/span>[<\/span>0<\/span>];<\/span>\r\n\/\/ string(3) \"\u4e0a\"<\/span>\r\n<\/code><\/pre>\n
(<\/span>string<\/span>)<\/span>$xml_object<\/span>-><\/span>body<\/span>-><\/span>p<\/span>[<\/span>0<\/span>]<\/span>-><\/span>attributes<\/span>()<\/span>-><\/span>id<\/span>;<\/span>\r\n\/\/ string(5) \"first\"<\/span>\r\n<\/code><\/pre>\n
(<\/span>string<\/span>)<\/span>$xml_object<\/span>-><\/span>body<\/span>-><\/span>p<\/span>[<\/span>0<\/span>][<\/span>'id'<\/span>];<\/span>\r\n\/\/ string(5) \"first\"<\/span>\r\n<\/code><\/pre>\n
xpath -> XPath<\/p>\n
\u8981\u7d20\u9009\u62e9<\/p>\n
\u9009\u62e9\u8981\u7d20\u7684\u5185\u5bb9<\/p>\n
$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/html\/body\/p[.=\"\u4e2d\"]'<\/span>);<\/span> \/\/ \u30eb\u30fc\u30c8\u304b\u3089\u6307\u5b9a<\/span>\r\n$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/\/body\/p[.=\"\u4e2d\"]'<\/span>);<\/span> \/\/ \u9014\u4e2d\u304b\u3089\u6307\u5b9a<\/span>\r\n\/\/ array(1) { [0]=> object(SimpleXMLElement)#3 (2) { [\"@attributes\"]=> array(1) { [\"id\"]=> string(6) \"second\" } [0]=> string(3) \"\u4e2d\" } }<\/span>\r\n<\/code><\/pre>\n
\u9009\u62e9\u8981\u7d20\u7684\u5c5e\u6027<\/p>\n
$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/\/p[@id=\"first\"]'<\/span>);<\/span>\r\n\/\/ array(1) { [0]=> object(SimpleXMLElement)#3 (2) { [\"@attributes\"]=> array(1) { [\"id\"]=> string(5) \"first\" } [0]=> string(3) \"\u4e0a\" } }<\/span>\r\n\r\n$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/\/p[@class=\"test\"]'<\/span>);<\/span>\r\n\/\/ array(1) { [0]=> object(SimpleXMLElement)#3 (2) { [\"@attributes\"]=> array(2) { [\"id\"]=> string(5) \"third\" [\"class\"]=> string(4) \"test\" } [0]=> string(3) \"\u4e0b\" } }<\/span>\r\n<\/code><\/pre>\n
\u6309\u7167\u8981\u7d20\u987a\u5e8f\u9009\u62e9\uff08\u7b2c\u4e00\u4e2a\u5143\u7d20\u4e3a1\uff09<\/p>\n
$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/\/p[2]'<\/span>);<\/span>\r\n\/\/ array(1) { [0]=> object(SimpleXMLElement)#3 (2) { [\"@attributes\"]=> array(1) { [\"id\"]=> string(6) \"second\" } [0]=> string(3) \"\u4e2d\" } }<\/span>\r\n<\/code><\/pre>\n
\u9009\u62e9\u5177\u6709\u7279\u5b9a\u5b50\u5143\u7d20\u7684\u5143\u7d20\u3002<\/p>\n
$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/\/div[p]'<\/span>);<\/span> \/\/ \u76f4\u8fd1\u306e\u5b50\u8981\u7d20\u306bp\u3092\u6301\u3064div<\/span>\r\n\/\/ array(2) { [0]=> object(SimpleXMLElement)#3 (1) { [\"p\"]=> string(7) \"sampleB\" } [1]=> object(SimpleXMLElement)#4 (2) { [\"p\"]=> object(SimpleXMLElement)#5 (1) { [\"span\"]=> string(7) \"sampleC\" } [\"div\"]=> string(7) \"sampleD\" } }<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528\u5c42\u7ea7\u6765\u9009\u62e9<\/p>\n
$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/\/div\/p[1]\/..\/..\/p[1]'<\/span>);<\/span>\r\n\/\/ array(1) { [0]=> object(SimpleXMLElement)#3 (2) { [\"@attributes\"]=> array(1) { [\"id\"]=> string(5) \"first\" } [0]=> string(3) \"\u4e0a\" } }<\/span>\r\n<\/code><\/pre>\n
\u83b7\u53d6\u503c\u5982\u679c\u65e0\u6cd5\u83b7\u53d6\u5230 $xml_object->xpath($xpath_string)\uff0c\u5219\u8fd4\u56de\u7a7a\u6570\u7ec4\uff1b\u5982\u679c\u53d1\u751f\u9519\u8bef\uff0c\u5219\u8fd4\u56de false\u3002<\/p>\n
\u5982\u679c\u7528 `! empty($xml_object->xpath($xpath_string))` \u8fdb\u884c\u5224\u65ad\uff0c\u5e76\u4e14\u5047\u8bbe\u5bf9\u8c61\u5b58\u5728\u3002<\/p>\n
\u83b7\u53d6\u8981\u7d20\u7684\u5185\u5bb9<\/p>\n
(<\/span>string<\/span>)<\/span>$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/\/p[2]'<\/span>)[<\/span>0<\/span>];<\/span>\r\n\/\/ string(3) \"\u4e2d\"<\/span>\r\n<\/code><\/pre>\n
\u83b7\u53d6\u8981\u7d20\u7684\u5c5e\u6027<\/p>\n
(<\/span>string<\/span>)<\/span>$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/\/p[2]\/@id'<\/span>)[<\/span>0<\/span>];<\/span>\r\n\/\/ string(6) \"second\"<\/span>\r\n<\/code><\/pre>\n
(<\/span>string<\/span>)<\/span>$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/\/p[3]\/@class'<\/span>)[<\/span>0<\/span>];<\/span>\r\n\/\/ string(4) \"test\"<\/span>\r\n<\/code><\/pre>\n
(<\/span>string<\/span>)<\/span>$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/\/meta[@property=\"og:title\"]\/@content'<\/span>)[<\/span>0<\/span>];<\/span>\r\n\/\/ string(33) \"html\u30b9\u30af\u30ec\u30a4\u30d4\u30f3\u30b0 - Qiita\"<\/span>\r\n<\/code><\/pre>\n
(<\/span>string<\/span>)<\/span>$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/\/meta[@property=\"og:image\"]\/@content'<\/span>)[<\/span>0<\/span>];<\/span>\r\n\/\/ string(74) \"https:\/\/cdn.qiita.com\/assets\/qiita-fb-2887e7b4aad86fd8c25cea84846f2236.png\"<\/span>\r\n<\/code><\/pre>\n
(<\/span>string<\/span>)<\/span>$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/\/meta[@property=\"og:description\"]\/@content'<\/span>)[<\/span>0<\/span>];<\/span>\r\n\/\/ string(16) \"og\u306edescription\"<\/span>\r\n<\/code><\/pre>\n
\n
\u4f60\u4e5f\u53ef\u4ee5\u5c06xpath\u5206\u5f00\u5199\u3002<\/p>\n
$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/\/div'<\/span>)[<\/span>1<\/span>]<\/span>-><\/span>xpath<\/span>(<\/span>'p'<\/span>);<\/span>\r\n\/\/ array(1) { [0]=> object(SimpleXMLElement)#6 (2) { [\"@attributes\"]=> array(1) { [\"class\"]=> string(4) \"test\" } [0]=> string(7) \"sampleB\" } }<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u60a8\u60f3\u83b7\u53d6\u6307\u5b9a\u5143\u7d20\u4e2d\u7684\u6240\u6709\u6587\u672c\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\uff1a
\n\u5982\u679c\u5728SimpleXMLElement\u4e2d\u5b58\u5728\u53e6\u4e00\u4e2aSimpleXMLElement\uff0c\u90a3\u4e48\u65e0\u6cd5\u901a\u8fc7(string)\u83b7\u53d6\u5d4c\u5957SimpleXMLElement\u4e2d\u7684\u6587\u672c\u3002
\n\u53ea\u80fd\u901a\u8fc7(string)\u83b7\u53d6\u6ca1\u6709\u6807\u7b7e\u7684\u76f4\u63a5\u5b50\u6587\u672c\u3002<\/p>\n
$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/\/div[@id=\"area\"]'<\/span>);<\/span>\r\n<\/code><\/pre>\n
array(1) {\r\n  [0]=>\r\n  object(SimpleXMLElement)#10948 (3) {\r\n    [\"@attributes\"]=>\r\n    array(1) {\r\n      [\"id\"]=>\r\n      string(4) \"area\"\r\n    }\r\n    [\"p\"]=>\r\n    object(SimpleXMLElement)#10950 (1) {\r\n      [\"span\"]=>\r\n      string(7) \"sampleC\"\r\n    }\r\n    [\"div\"]=>\r\n    string(7) \"sampleD\"\r\n  }\r\n}\r\n<\/code><\/pre>\n
(<\/span>string<\/span>)<\/span>$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/\/div[@id=\"area\"]'<\/span>)[<\/span>0<\/span>];<\/span>\r\n<\/code><\/pre>\n
string(87) \"\r\n\r\n\r\n                    sampleE\r\n                \"\r\n<\/code><\/pre>\n
\u5982\u679c\u60a8\u60f3\u83b7\u53d6\u4e0b\u65b9\u6587\u672c\u7684\u6240\u6709\u5185\u5bb9\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u5220\u9664\u6807\u7b7e\u8fdb\u884c\u63d0\u53d6\u3002<\/p>\n
strip_tags<\/span>(<\/span>$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/\/div[@id=\"area\"]'<\/span>)[<\/span>0<\/span>]<\/span>-><\/span>asXml<\/span>());<\/span>\r\n<\/code><\/pre>\n
string(147) \"\r\n\r\n                        sampleC\r\n\r\n                    sampleD\r\n                    sampleE\r\n                \"\r\n<\/code><\/pre>\n
\u8bf7\u6ce8\u610f\uff0c\u5e26\u6709\u6307\u5b9a\/@\u7684xpath\u5c06\u5982\u4e0b\u6240\u793a\uff08\/@id\u4f1a\u53d8\u4e3aid=”XXXXXX”\uff09\uff0c\u8bf7\u7559\u610f\u3002<\/p>\n
(<\/span>string<\/span>)<\/span>$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/\/@id'<\/span>)[<\/span>0<\/span>];<\/span>\r\n<\/code><\/pre>\n
string(5) \"first\"\r\n<\/code><\/pre>\n
strip_tags<\/span>(<\/span>$xml_object<\/span>-><\/span>xpath<\/span>(<\/span>'\/\/@id'<\/span>)[<\/span>0<\/span>]<\/span>-><\/span>asXml<\/span>());<\/span>\r\n<\/code><\/pre>\n
string(11) \" id=\"first\"\"\r\n<\/code><\/pre>\n
\u5f53\u6211\u5b9e\u9645\u5c1d\u8bd5\u4f7f\u7528\u722c\u866b\u8fdb\u884c\u6293\u53d6\u65f6\uff0c\u6709\u4e9b\u5b57\u7b26\u4e32\u662fHTML\u5b9e\u4f53\u5316\u7684\u5b57\u7b26\uff0c\u6240\u4ee5\u6211\u4f1a\u6309\u7167\u4e0b\u8ff0\u65b9\u5f0f\u4f7f\u7528\u3002<\/p>\n
mb_ereg_replace<\/span>(<\/span>'\\s'<\/span>,<\/span> ''<\/span>,<\/span> html_entity_decode<\/span>(<\/span>$string<\/span>,<\/span> ENT_QUOTES<\/span>));<\/span>\/\/ \u5168\u89d2\u30b9\u30da\u30fc\u30b9\u3092\u9664\u304f\u7a7a\u767d\u6587\u5b57\u306f\u524a\u9664<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-08-16T20:30:51+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-12T10:38:24+00:00\" \/>\n<meta name=\"author\" content=\"\u79d1, \u9896\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u79d1, \u9896\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8php%e8%bf%9b%e8%a1%8c%e7%bd%91%e7%bb%9c%e7%88%ac%e8%99%ab-2\/\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8php%e8%bf%9b%e8%a1%8c%e7%bd%91%e7%bb%9c%e7%88%ac%e8%99%ab-2\/\",\"name\":\"\u4f7f\u7528PHP\u8fdb\u884c\u7f51\u7edc\u722c\u866b - 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