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我正在尝试在 PHP 中使用 Xpath，但我有一个关于如何在路径中查找标签 (ID) 并检查它是否存在的问题。使用我的代码，我只会在匹配时得到它，但我必须验证并得到它们是否存在或不存在的真假。

Xpath 的 HTML： 

<map name="Map" id="Map">
  <area shape="poly" id="normal"  coords="181,1283,83,1282,108,177,1124,174,1124,205,1124,213,1126,218,1141,221,1182,224,1204,224,1231,221,1253,218,1265,203,1266,174,2055,171,2055,1092,2002,1077,1935,1057,1920,1052,1904,1051,1901,1043,1893,1036,1874,1034,1861,1030,1829,1025,1802,1022,1785,1021,1765,1020,1741,1018,1723,1022,1720,1026,1714,1029,1713,1035,1715,1041,1713,1049,1616,1047,1509,1047,1436,1048,1417,1049,1386,1049,1318,1048,1304,1047,1300,1048,1288,1052,1278,1049,1247,1047,1177,1049,1135,1048,1069,1047,1047,1046,1000,1047,946,1047,902,1048,842,1048,814,1049,799,1049,778,1049,768,1051,763,1050,742,1048,698,1048,662,1048,573,1101,581,387,575,385,197,386,181,1283" href="#" />
  <area id="excludente" shape="rect" coords="952,491,1494,769" href="#" />
  <area id="excludente" shape="poly" coords="654,599,663,580,669,577,731,578,736,579,739,588,738,599,738,677,734,682,729,684,667,685,662,679,659,668,653,600,653,598" href="#" />
  <area shape="poly" coords="1695,582,1697,579,1700,577,1709,576,1769,576,1771,578,1787,598,1786,605,1770,681,1764,685,1746,684,1705,683,1698,681,1696,675,1695,583" href="#" />
  <area shape="poly" coords="-1,84,2056,78,2055,0,0,0,0,83" href="#" />
</map>

代码： 

$DOM = new DOMDocument; 
$DOM->loadHTML($conteudo['ambiente']->mapeamento);
$xpath = new DOMXPath($DOM);
$tags = $xpath->query('//area/@shape');

foreach ($tags as $linha => $tag) {
    $ctags = $xpath->query("../@id", $tag);

    //Verify ecah one, not just the founded
    foreach ($ctags as $linha_item2 => $ctag) {
        echo $ctag->nodeValue;
    }
}
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1 回答 1

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$tag->parentNode->hasAttribute('id')在形状上使用$tag（实际上是一个属性），或者在一个 xpath 中执行：

带id的区域，选择shape属性：

//area[@id]/@shape

没有id的区域，选择shape属性：

//area[not(@id)]/@shape

一些示例（->parentNode属性的 是它所在的实际<area>元素）：

$tags = $xpath->query('//area/@shape');
foreach ($tags as $linha => $tag) {
    if($tag->parentNode->hasAttribute('id')){
          echo $tag->parentNode->getAttribute('id').PHP_EOL;
    } else {
          echo 'Oh no, I have no ID!'.PHP_EOL;
    }
}

或者：

$ids =  $xpath->query('//area[@shape]/@id');
foreach($ids as $id){
        echo $id->nodeValue.PHP_EOL;
}
于 2013-03-06T20:36:23.707 回答