simple_html_dom类，实际上明文函数返回的是什么？

Question

我想我不明白。我试着解析某些HTML页面：使用

<select name="sel"> 
    <option value="val0">-please select me-</option> 
    <option value="val1">some selection</option> 
</select> 

IM的Simple_html_dom类：

foreach($html->find('select') as $s) { 
    if ($html->find('option',1) != false) { 
     $tempoption = $html->find('option',1)->plaintext; 
     echo $tempoption; //shows 'some selection' 
    } 
} 

但是，这时如果我只是用这个行：

$value=''; 
if ($tempoption == 'some selection') 
    $value='79'; 
echo $value; //doesn't shows anything (empty variable?) 

//or this one : 
if (strcmp($tempoption, 'some selection')) 
    $value='79'; 
echo $value; //Nope. 

Answer 1

我尝试了代码就像你在那里和$value DID结束了79.但我认为你必须有更多的HTML比那小小的片段。在你的代码中，对我来说最突出的事情是你将条件包装在一个循环中，通过HTML的所有选择，但是你没有使用从循环中获得的单个选择元素，所以foreach循环似乎毫无意义..

看一看这样的：

foreach($html->find('select option') as $o) 
{ 
    $o_label = $o->plaintext; 
    if($o_label=='some selection') echo 'PERFECT MATCH: '.$o_label."\n"; 
    else if(stripos($o_label, 'some selection')!==false) echo 'LOOSE MATCH: '.$o_label."\n"; 
    else echo 'DOES NOT MATCH: '.$o_label."\n"; 
} 

当给定的HTML：

<select name="sel"> 
    <option value="val0">-please select me-</option> 
    <option value="val1">1 some selection</option> 
    <option value="val1">This does not match</option> 
    <option value="val1">some selection</option> 
    <option value="val1">Another non-matching label</option> 
    <option value="val1">some selection 3</option> 
    <option value="val1">One more that does not match</option> 
    <option value="val1">4 SoME sElEcTIon 4</option> 
</select> 

输出将为：

DOES NOT MATCH: -please select me- 
LOOSE MATCH: 1 some selection 
DOES NOT MATCH: This does not match 
PERFECT MATCH: some selection 
DOES NOT MATCH: Another non-matching label 
LOOSE MATCH: some selection 3 
DOES NOT MATCH: One more that does not match 
LOOSE MATCH: 4 SoME sElEcTIon 4