关于php：simple_html_dom：为什么$ html(包含要解析的表的字符串)为空？

simple_html_dom: why is the $html (string which contains the table to be parsed) empty?

我有一个字符串，其中包含HTML表的HTML。我想从表中提取数据作为维数组。类似于：

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$Data = Array ( [0]=> Array([0]=>'Name', [1]=>'Age', [2]=>'CGPA'),
[1]=> Array([0]=>'Bob', [1]=>'24', [2]=>'3'),
[2]=> Array([0]=>'Alice', [1]=>'23', [2]=>'2'),
[3]=>Array([0]=>'Amy', [1]=>'22', [2]=>'4') )

我尝试了很多方法，但是它们一直给我错误。现在，我正在使用" simple_html_dom"，它似乎很容易理解。因此，我将使用它。

我正在尝试使用该问题的可接受答案中给出的代码。但这给了我Fatal error: Call to a member function find() on a non-object on line 34

我搜索并找到了解决方案，但是当我放入支票(在下面的代码中注释)时，我得到了Parse error: syntax error, unexpected ''$html is empty!'' (T_CONSTANT_ENCAPSED_STRING) on line 35，我不知道为什么它是空的！可能是字符串，而不是预期的对象？但是我该怎么办？

代码：-

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<?php

require('simple_html_dom.php');

$html = 'Edit question<h4 class="accesshide">Question text</h4><input type="hidden" name="q18:1_:sequencecheck" value="1" /><table style="width: 454px; height: 269px;" border="1"><caption> </caption>
<tbody>
<tr>
<td>Name</td>
<td>Age</td>
<td>CGPA</td>
</tr>
<tr>
<td>Alice</td>
<td>24</td>
<td>4</td>
</tr>
<tr>
<td>Bob</td>
<td>14</td>
<td>3</td>
</tr>
<tr>
<td>Amy</td>
<td>33</td>
<td>2</td>
</tr>
</tbody>
</table>
<p> </p>
<p>Blah BlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlah BlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlah?</p>Select one:<input type="radio" name="q18:1_answer" value="0" id="q18:1_answer0" /><label for="q18:1_answer0">a. [1]ir[/1][2]34[/2]</label> ';

//if (!empty($html)) {
// get the table. Maybe there's just one, in which case just 'table' will do
$table = $html->find('table');
//} else {die '$html is empty!';}

// initialize empty array to store the data array from each row, that is the array containing the rows (that is entire <tr> tag).
$rowData = array();

// loop over rows
foreach($table->find('tr') as $row) {

// initialize array to store the cell data from each row, that is the arrays containing data from <td> tags
$cellData = array();
foreach($row->find('td.text') as $cell) {

// push the cell's text to the array
$cellData[] = $cell->innertext;
}

// push the row's data array to the 'big' array
$rowData[] = $rowData;
}
print_r($rowData);

您可以直接将其指向表格行。示例：

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$html_string = 'Edit question<h4 class="accesshide">Question text</h4><input type="hidden" name="q18:1_:sequencecheck" value="1" /><table style="width: 454px; height: 269px;" border="1"><caption> </caption><tbody><tr><td>Name</td><td>Age</td><td>CGPA</td></tr><tr><td>Alice</td><td>24</td><td>4</td></tr><tr><td>Bob</td><td>14</td><td>3</td></tr><tr><td>Amy</td><td>33</td><td>2</td></tr></tbody></table><p> </p><p>Blah BlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlah BlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlahBlah?</p>Select one:<input type="radio" name="q18:1_answer" value="0" id="q18:1_answer0" /><label for="q18:1_answer0">a. [1]ir[/1][2]34[/2]</label> ';
$html = str_get_html($html_string); // load the string
$rowData = array();
foreach($html->find('table tr') as $row_key => $row) { // load each row
foreach($row->children() as $td) { // for every td
$rowData[$row_key][] = $td->innertext; // push the each td in that row
}
}

echo '[cc lang="php"]';
print_r($rowData);

应该这样输出：

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Array
(
[0] => Array
(
[0] => Name
[1] => Age
[2] => CGPA
)

[1] => Array
(
[0] => Alice
[1] => 24
[2] => 4
)

[2] => Array
(
[0] => Bob
[1] => 14
[2] => 3
)

[3] => Array
(
[0] => Amy
[1] => 33
[2] => 2
)
)

您的代码说明：

1	$table = $html->find('table');

您还不能调用->find，因为没有初始化的SimpleHTMLDOM对象。首先需要str_get_html()或file_get_html()。