问题
I have a code that reads an HTML file from my local web server localhost and then converts it to XHTML with tidy. Then i load that XHTML into my DOM. the code looks like this
<?php
function getXHTML($html)
{
$options = array("output-html" => true,"quote-nbsp" => true, "drop-proprietary-attributes" => true,"drop-font-tags" => true,"drop-empty-paras" => true,"hide-comments" => true);
$tidy=new tidy();
$xhtml=$tidy->repairString($html,$options);
echo $xhtml;
return $xhtml;
}
$content = file_get_contents("http://localhost/filename.htm");
$page = new DOMDocument();
$xpath=new DOMXPath($page);
$content = getXHTML($content); // this is a tidy function to return XHTML
$page->loadHTML($content);
$totalPath = "//body/table[3]/tbody/tr[1]/td[4]";
$total = $xpath->query($totalPath);
echo $total->length; // this shows zero
?>
the contents of filename.htm looks like this
<!-- saved from url=(0041)http://www.rtu.ac.in/results/reformat.php -->
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="SHORTCUT ICON" href="http://www.rtu.ac.in/favicon.ico">
<link href="./Result - Rajasthan Technical University6_files/styleresults.css" rel="stylesheet" type="text/css">
<title>Result - Rajasthan Technical University</title>
</head>
<body>
<table width="773" cellpadding="5" cellspacing="0" align="center">
<tbody><tr height="60">
<td width="16%" height="60" valign="top"><font color="brown" size="+2"><img src="./Result - Rajasthan Technical University6_files/logo.jpg" width="100" height="102" border="0" align="right"> </font></td>
<td width="72%" height="60" align="center" valign="top"><p><font color="brown" size="+2"><strong>RAJASTHAN TECHNICAL UNIVERSITY </strong></font></p><font color="brown" size="+2">
<p><font size="+1"><strong>B.Tech -IVth SEMESTER -2010(Main) 16.5.2011</strong></font></p><font size="+1"> </font></font></td>
<td width="12%" height="80"><strong>www.rtu.ac.in</strong> </td>
</tr>
</tbody></table>
<br>
<br>
<table width="783" align="center" cellpadding="5" cellspacing="0" class="table">
<tbody>
<tr>
<td width="34%" align="center" valign="top" rowspan="2"><strong>Subject(s) Name </strong> </td>
<td width="10%" align="center" valign="top" colspan="1" rowspan="2"> <strong>Subject(s) Code </strong> </td>
<td align="center" valign="top" colspan="3" rowspan="1"><strong>Marks Obtained </strong> </td>
</tr>
<tr>
<td width="20%" align="center"><strong>Internal</strong> </td>
<td width="18%" align="center"><strong>Theory</strong> </td>
<td width="18%" align="center"> </td>
</tr>
<tr>
<td width="34%" align="center" style=" border-bottom: 0px none transparent;"><strong>SUBJECT-1</strong> </td>
<td width="10%" align="center" style=" border-bottom: 0px none transparent;">4551</td>
<td width="20%" align="center" style=" border-bottom: 0px none transparent;"> 16</td>
<td width="18%" align="center" style=" border-bottom: 0px none transparent;"> 50</td>
<td width="18%" align="center" style=" border-bottom: 0px none transparent;"> </td>
</tr>
<tr>
<td width="34%" align="center" style=" border-bottom: 0px none transparent;"><strong>SUBJECT-2</strong> </td>
<td width="10%" align="center" style=" border-bottom: 0px none transparent;"> 4552</td>
<td width="20%" align="center" style=" border-bottom: 0px none transparent;"> 17</td>
<td width="18%" align="center" style=" border-bottom: 0px none transparent;"> 61</td>
<td width="18%" align="center" style=" border-bottom: 0px none transparent;"> </td>
</tr>
<tr>
<td width="34%" align="center" style=" border-bottom: 0px none transparent;"><strong>SUBJECT-3</strong> </td>
<td width="10%" align="center" style=" border-bottom: 0px none transparent;">4553</td>
<td width="20%" align="center" style=" border-bottom: 0px none transparent;"> 19</td>
<td width="18%" align="center" style=" border-bottom: 0px none transparent;"> 49</td>
<td width="18%" align="center" style=" border-bottom: 0px none transparent;"> </td>
</tr>
<tr>
<td align="center" style=" border-bottom: 0px none transparent;"><strong>SUBJECT-4</strong> </td>
<td align="center" style=" border-bottom: 0px none transparent;">4554</td>
<td align="center" style=" border-bottom: 0px none transparent;"> 14</td>
<td align="center" style=" border-bottom: 0px none transparent;"> 68</td>
<td align="center" style=" border-bottom: 0px none transparent;"> </td>
</tr>
<tr>
<td align="center" style=" border-bottom: 0px none transparent;"><strong>SUBJECT-5</strong> </td>
<td align="center" style=" border-bottom: 0px none transparent;">4555</td>
<td align="center" style=" border-bottom: 0px none transparent;"> 14</td>
<td align="center" style=" border-bottom: 0px none transparent;"> 36</td>
<td align="center" style=" border-bottom: 0px none transparent;"> </td>
</tr>
<tr>
<td width="34%" align="center" style=" border-bottom: 0px none transparent;"><strong>SUBJECT-6</strong> </td>
<td width="10%" align="center" style=" border-bottom: 0px none transparent;">4556</td>
<td width="20%" align="center" style=" border-bottom: 0px none transparent;"> 19</td>
<td width="18%" align="center" style=" border-bottom: 0px none transparent;"> 48</td>
<td width="18%" align="center" style=" border-bottom: 0px none transparent;"> </td>
</tr><tr>
<td align="center" style=" border-bottom: 0px none transparent;"> </td>
<td align="center" style=" border-bottom: 0px none transparent;"> </td>
<td align="center" style=" border-bottom: 0px none transparent;"> </td>
<td align="center" style=" border-bottom: 0px none transparent;"> <strong>Internal</strong> </td>
<td width="18%" align="center" style=" border-bottom: 0px none transparent;"><strong>Practical</strong> </td>
</tr>
<tr>
<td width="34%" align="center" style=" border-bottom: 0px none transparent;"><strong>PSUBJECT-1</strong> </td>
<td width="10%" align="center" style=" border-bottom: 0px none transparent;">4174</td>
<td width="20%" align="center" style=" border-bottom: 0px none transparent;"> </td>
<td width="18%" align="center" style=" border-bottom: 0px none transparent;"> 29</td>
<td width="18%" align="center" style=" border-bottom: 0px none transparent;">48</td>
</tr>
<tr>
<td width="34%" align="center" style=" border-bottom: 0px none transparent;"><strong>PSUBJECT-2</strong> </td>
<td width="10%" align="center" style=" border-bottom: 0px none transparent;">4175</td>
<td width="20%" align="center" style=" border-bottom: 0px none transparent;"> </td>
<td width="18%" align="center" style=" border-bottom: 0px none transparent;"> 16</td>
<td width="18%" align="center" style=" border-bottom: 0px none transparent;">26</td>
</tr>
<tr>
<td width="34%" align="center" style=" border-bottom: 0px none transparent;"><strong>PSUBJECT-3</strong> </td>
<td width="10%" align="center" style=" border-bottom: 0px none transparent;">4171</td>
<td width="20%" align="center" style=" border-bottom: 0px none transparent;"> </td>
<td width="18%" align="center" style=" border-bottom: 0px none transparent;"> 15</td>
<td width="18%" align="center" style=" border-bottom: 0px none transparent;">27</td>
</tr>
<tr>
<td align="center" style=" border-bottom: 0px none transparent;"><strong>PSUBJECT-4</strong> </td>
<td align="center" style=" border-bottom: 0px none transparent;">4172</td>
<td align="center" style=" border-bottom: 0px none transparent;"> </td>
<td align="center" style=" border-bottom: 0px none transparent;"> 17</td>
<td align="center" style=" border-bottom: 0px none transparent;">29</td>
</tr>
<tr>
<td align="center" style=" border-bottom: 0px none transparent;"><strong>PSUBJECT-5</strong> </td>
<td align="center" style=" border-bottom: 0px none transparent;">4173</td>
<td align="center" style=" border-bottom: 0px none transparent;"> </td>
<td align="center" style=" border-bottom: 0px none transparent;"> 29</td>
<td align="center" style=" border-bottom: 0px none transparent;">46</td>
</tr>
<tr>
<td width="34%" align="center" style=" border-bottom: 0px none transparent;"><strong>Disipline (Deca)</strong> </td>
<td width="10%" align="center" style=" border-bottom: 0px none transparent;">4176</td>
<td width="20%" align="center" style=" border-bottom: 0px none transparent;"> </td>
<td width="18%" align="center" style=" border-bottom: 0px none transparent;"> </td>
<td width="18%" align="center" style=" border-bottom: 0px none transparent;">46</td>
</tr>
<tr><td> </td><td> </td><td> </td><td> </td><td> </td></tr></tbody>
</table>
<br><table width="783" align="center" cellpadding="5" cellspacing="0" class="table">
<tbody><tr>
<td width="18%" align="center" valign="top"><strong>Practical Marks </strong> </td>
<td width="18%" align="center" valign="top">328</td>
<td width="19%" align="center" valign="top"><strong>Theory Marks </strong> </td>
<td width="19%" align="center" valign="top">411</td>
</tr>
<tr>
<td width="18%" align="center"><strong>Institute Code </strong> </td>
<td width="18%" align="center"> 1229 </td>
<td width="19%" align="center"><strong>DECCA </strong> </td>
<td width="19%" align="center">4176</td>
</tr>
<tr>
<td width="18%" align="center"><strong>Division </strong> </td>
<td width="18%" align="center"> PASS </td>
<td width="19%" align="center"><strong>Grand Total </strong> </td>
<td width="19%" align="center">739</td>
</tr>
</tbody></table>
<!-- Reformatter by Shashank Kumar Jain (CS, IIIrd Year, 2010-11) -->
<div id="csscan-wrapper" style="display: none; "><h2 id="csscan-header">element</h2><table id="csscan-table"><tbody><tr><th colspan="2" id="csscan-header-font" class="csscan-header">Font</th></tr><tr id="csscan-row-font-family"><td id="csscan-property-font-family" class="csscan-property">font-family</td><td id="csscan-value-font-family" class="csscan-value"></td></tr><tr id="csscan-row-font-size"><td id="csscan-property-font-size" class="csscan-property">font-size</td><td id="csscan-value-font-size" class="csscan-value"></td></tr><tr id="csscan-row-font-style"><td id="csscan-property-font-style" class="csscan-property">font-style</td><td id="csscan-value-font-style" class="csscan-value"></td></tr><tr id="csscan-row-font-variant"><td id="csscan-property-font-variant" class="csscan-property">font-variant</td><td id="csscan-value-font-variant" class="csscan-value"></td></tr><tr id="csscan-row-font-weight"><td id="csscan-property-font-weight" class="csscan-property">font-weight</td><td id="csscan-value-font-weight" class="csscan-value"></td></tr><tr id="csscan-row-letter-spacing"><td id="csscan-property-letter-spacing" class="csscan-property">letter-spacing</td><td id="csscan-value-letter-spacing" class="csscan-value"></td></tr><tr id="csscan-row-line-height"><td id="csscan-property-line-height" class="csscan-property">line-height</td><td id="csscan-value-line-height" class="csscan-value"></td></tr><tr id="csscan-row-text-decoration"><td id="csscan-property-text-decoration" class="csscan-property">text-decoration</td><td id="csscan-value-text-decoration" class="csscan-value"></td></tr><tr id="csscan-row-text-align"><td id="csscan-property-text-align" class="csscan-property">text-align</td><td id="csscan-value-text-align" class="csscan-value"></td></tr><tr id="csscan-row-text-indent"><td id="csscan-property-text-indent" class="csscan-property">text-indent</td><td id="csscan-value-text-indent" class="csscan-value"></td></tr><tr id="csscan-row-text-transform"><td id="csscan-property-text-transform" class="csscan-property">text-transform</td><td id="csscan-value-text-transform" class="csscan-value"></td></tr><tr id="csscan-row-white-space"><td id="csscan-property-white-space" class="csscan-property">white-space</td><td id="csscan-value-white-space" class="csscan-value"></td></tr><tr id="csscan-row-word-spacing"><td id="csscan-property-word-spacing" class="csscan-property">word-spacing</td><td id="csscan-value-word-spacing" class="csscan-value"></td></tr><tr id="csscan-row-color"><td id="csscan-property-color" class="csscan-property">color</td><td id="csscan-value-color" class="csscan-value"></td></tr><tr><th colspan="2" id="csscan-header-background" class="csscan-header">Background</th></tr><tr id="csscan-row-background-attachment"><td id="csscan-property-background-attachment" class="csscan-property">bg-attachment</td><td id="csscan-value-background-attachment" class="csscan-value"></td></tr><tr id="csscan-row-background-color"><td id="csscan-property-background-color" class="csscan-property">bg-color</td><td id="csscan-value-background-color" class="csscan-value"></td></tr><tr id="csscan-row-background-image"><td id="csscan-property-background-image" class="csscan-property">bg-image</td><td id="csscan-value-background-image" class="csscan-value"></td></tr><tr id="csscan-row-background-position"><td id="csscan-property-background-position" class="csscan-property">bg-position</td><td id="csscan-value-background-position" class="csscan-value"></td></tr><tr id="csscan-row-background-repeat"><td id="csscan-property-background-repeat" class="csscan-property">bg-repeat</td><td id="csscan-value-background-repeat" class="csscan-value"></td></tr><tr><th colspan="2" id="csscan-header-size" class="csscan-header">Box</th></tr><tr id="csscan-row-width"><td id="csscan-property-width" class="csscan-property">width</td><td id="csscan-value-width" class="csscan-value"></td></tr><tr id="csscan-row-height"><td id="csscan-property-height" class="csscan-property">height</td><td id="csscan-value-height" class="csscan-value"></td></tr><tr id="csscan-row-border-top"><td id="csscan-property-border-top" class="csscan-property">border-top</td><td id="csscan-value-border-top" class="csscan-value"></td></tr><tr id="csscan-row-border-right"><td id="csscan-property-border-right" class="csscan-property">border-right</td><td id="csscan-value-border-right" class="csscan-value"></td></tr><tr id="csscan-row-border-bottom"><td id="csscan-property-border-bottom" class="csscan-property">border-bottom</td><td id="csscan-value-border-bottom" class="csscan-value"></td></tr><tr id="csscan-row-border-left"><td id="csscan-property-border-left" class="csscan-property">border-left</td><td id="csscan-value-border-left" class="csscan-value"></td></tr><tr id="csscan-row-margin"><td id="csscan-property-margin" class="csscan-property">margin</td><td id="csscan-value-margin" class="csscan-value"></td></tr><tr id="csscan-row-padding"><td id="csscan-property-padding" class="csscan-property">padding</td><td id="csscan-value-padding" class="csscan-value"></td></tr><tr id="csscan-row-max-height"><td id="csscan-property-max-height" class="csscan-property">max-height</td><td id="csscan-value-max-height" class="csscan-value"></td></tr><tr id="csscan-row-min-height"><td id="csscan-property-min-height" class="csscan-property">min-height</td><td id="csscan-value-min-height" class="csscan-value"></td></tr><tr id="csscan-row-max-width"><td id="csscan-property-max-width" class="csscan-property">max-width</td><td id="csscan-value-max-width" class="csscan-value"></td></tr><tr id="csscan-row-min-width"><td id="csscan-property-min-width" class="csscan-property">min-width</td><td id="csscan-value-min-width" class="csscan-value"></td></tr><tr id="csscan-row-outline-color"><td id="csscan-property-outline-color" class="csscan-property">outline-color</td><td id="csscan-value-outline-color" class="csscan-value"></td></tr><tr id="csscan-row-outline-style"><td id="csscan-property-outline-style" class="csscan-property">outline-style</td><td id="csscan-value-outline-style" class="csscan-value"></td></tr><tr id="csscan-row-outline-width"><td id="csscan-property-outline-width" class="csscan-property">outline-width</td><td id="csscan-value-outline-width" class="csscan-value"></td></tr><tr><th colspan="2" id="csscan-header-position" class="csscan-header">Positioning</th></tr><tr id="csscan-row-position"><td id="csscan-property-position" class="csscan-property">position</td><td id="csscan-value-position" class="csscan-value"></td></tr><tr id="csscan-row-top"><td id="csscan-property-top" class="csscan-property">top</td><td id="csscan-value-top" class="csscan-value"></td></tr><tr id="csscan-row-bottom"><td id="csscan-property-bottom" class="csscan-property">bottom</td><td id="csscan-value-bottom" class="csscan-value"></td></tr><tr id="csscan-row-right"><td id="csscan-property-right" class="csscan-property">right</td><td id="csscan-value-right" class="csscan-value"></td></tr><tr id="csscan-row-left"><td id="csscan-property-left" class="csscan-property">left</td><td id="csscan-value-left" class="csscan-value"></td></tr><tr id="csscan-row-float"><td id="csscan-property-float" class="csscan-property">float</td><td id="csscan-value-float" class="csscan-value"></td></tr><tr id="csscan-row-display"><td id="csscan-property-display" class="csscan-property">display</td><td id="csscan-value-display" class="csscan-value"></td></tr><tr id="csscan-row-clear"><td id="csscan-property-clear" class="csscan-property">clear</td><td id="csscan-value-clear" class="csscan-value"></td></tr><tr id="csscan-row-z-index"><td id="csscan-property-z-index" class="csscan-property">z-index</td><td id="csscan-value-z-index" class="csscan-value"></td></tr><tr><th colspan="2" id="csscan-header-list" class="csscan-header">List</th></tr><tr id="csscan-row-list-style-image"><td id="csscan-property-list-style-image" class="csscan-property">list-style-image</td><td id="csscan-value-list-style-image" class="csscan-value"></td></tr><tr id="csscan-row-list-style-type"><td id="csscan-property-list-style-type" class="csscan-property">list-style-type</td><td id="csscan-value-list-style-type" class="csscan-value"></td></tr><tr id="csscan-row-list-style-position"><td id="csscan-property-list-style-position" class="csscan-property">list-style-position</td><td id="csscan-value-list-style-position" class="csscan-value"></td></tr><tr><th colspan="2" id="csscan-header-table" class="csscan-header">Table</th></tr><tr id="csscan-row-vertical-align"><td id="csscan-property-vertical-align" class="csscan-property">vertical-align</td><td id="csscan-value-vertical-align" class="csscan-value"></td></tr><tr id="csscan-row-border-collapse"><td id="csscan-property-border-collapse" class="csscan-property">border-collapse</td><td id="csscan-value-border-collapse" class="csscan-value"></td></tr><tr id="csscan-row-border-spacing"><td id="csscan-property-border-spacing" class="csscan-property">border-spacing</td><td id="csscan-value-border-spacing" class="csscan-value"></td></tr><tr id="csscan-row-caption-side"><td id="csscan-property-caption-side" class="csscan-property">caption-side</td><td id="csscan-value-caption-side" class="csscan-value"></td></tr><tr id="csscan-row-empty-cells"><td id="csscan-property-empty-cells" class="csscan-property">empty-cells</td><td id="csscan-value-empty-cells" class="csscan-value"></td></tr><tr id="csscan-row-table-layout"><td id="csscan-property-table-layout" class="csscan-property">table-layout</td><td id="csscan-value-table-layout" class="csscan-value"></td></tr><tr><th colspan="2" id="csscan-header-effects" class="csscan-header">Effects</th></tr><tr id="csscan-row-text-shadow"><td id="csscan-property-text-shadow" class="csscan-property">text-shadow</td><td id="csscan-value-text-shadow" class="csscan-value"></td></tr><tr id="csscan-row--webkit-box-shadow"><td id="csscan-property--webkit-box-shadow" class="csscan-property">-webkit-box-shadow</td><td id="csscan-value--webkit-box-shadow" class="csscan-value"></td></tr><tr id="csscan-row-border-radius"><td id="csscan-property-border-radius" class="csscan-property">border-radius</td><td id="csscan-value-border-radius" class="csscan-value"></td></tr><tr><th colspan="2" id="csscan-header-other" class="csscan-header">Other</th></tr><tr id="csscan-row-overflow"><td id="csscan-property-overflow" class="csscan-property">overflow</td><td id="csscan-value-overflow" class="csscan-value"></td></tr><tr id="csscan-row-cursor"><td id="csscan-property-cursor" class="csscan-property">cursor</td><td id="csscan-value-cursor" class="csscan-value"></td></tr><tr id="csscan-row-visibility"><td id="csscan-property-visibility" class="csscan-property">visibility</td><td id="csscan-value-visibility" class="csscan-value"></td></tr></tbody></table></div></body></html>
the XPath above is correct as i have checked it with FirePath. can anyone tell me what i am doing wrong?
回答1:
Try to use loadHTML($string) instead of loadXML. From manual:
The function parses the HTML contained in the string source. Unlike loading XML, HTML does not have to be well-formed to load.
Update 1
loadHTML creates the same DOM tree in memory as loadXML does. It only uses less strict parser. Here is example code with XPath:
<?php
$content = file_get_contents("1.html");
$page = new DOMDocument();
$page->loadHTML($content); // this will ignore most errors in formating
echo $page->saveHTML();
echo "=====\n";
$xpath = new DOMXPath($page); // use any "XML" parsing function
foreach ($xpath->query("//li[not(@id='3')]") as $elem) {
echo "[".trim($elem->textContent)."]\n";
}
Content of 1.html file is:
<li id="1">item 1
<li id="2">item 2
<li id="3">item 3
<li id="4">item 4
Output will be:
<!DOCTYPE html PUBLIC "...">
<html><body>
<li id="1">item 1
</li>
<li id="2">item 2
</li>
<li id="3">item 3
</li>
<li id="4">item 4
</li>
</body></html>
=====
[item 1]
[item 2]
[item 4]
Update 2
You just missed initializing for $xpath variable. I've also removed getXHTML call, because it's not necessary:
$content = file_get_contents("2.html");
$page = new DOMDocument();
//$content=getXHTML($content); // no need this if you're using loadHTML
$page->loadHTML($content);
$totalPath = "//body/table[3]/tbody/tr[1]/td[4]";
$xpath = new DOMXPath($page); // creating $xpath object
$total = $xpath->query($totalPath);
echo "[",$total->length,"]";
回答2:
How much have you played with the PHP Tidy options? If the error you get refers to entities (specifically ) I wonder if setting numeric-entities "on" or playing with the value for preserve-entities would help.
Plan B: Try this. XPath worked even with poorly formed html files.
<?php
$oldSetting = libxml_use_internal_errors( true );
libxml_clear_errors();
$html = new DOMDocument();
$html->loadHtmlFile(
'myHtmlFile.html');
$xpath = new DOMXPath( $html );
$test = $xpath->query( "//div[@id='mydiv']" );
$div = $test->item(0);
echo $div->getAttribute('style');
libxml_clear_errors();
libxml_use_internal_errors( $oldSetting );
?>
回答3:
the answer to the above question somewhat tricky. my original code looked something like
$xpath=new DOMXPath($page);
..
...
...
$page->loadHTML($content);
..
...
$totalPath = "//body/table[3]/tbody/tr[1]/td[4]";
$total = $xpath->query($totalPath);
...
...
what happens above is that $xpath is created on an empty document because the html is still not loaded in the Dom. so when xpath ran any query it ran the query on an empty document.
now i changed the order of the 2 statements
...
...
$page->loadHTML($content);
$xpath=new DOMXPath($page);
...
...
$totalPath = "//body/table[3]/tbody/tr[1]/td[4]";
$total = $xpath->query($totalPath);
now it works because $xpath is created on a nonempty document
来源：https://stackoverflow.com/questions/6221979/xpath-not-working-on-the-html