什麼不對的代碼

Question

<?php 

$html = 'sdfknjasdf kjfdasj fjknadssajkndf kjadsknajsdfjndfasjk <tr class="vcard agent"> 
<span class="fn"><a href="/wiki/Brad_Jones_(footballer)" title="Brad Jones (footballer)">Brad Jones</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Glen_Johnson_(English_footballer)" title="Glen Johnson (English footballer)">Glen Johnson</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Jos%C3%A9_Enrique_S%C3%A1nchez" title="José Enrique Sánchez">José Enrique</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Raul_Meireles" title="Raul Meireles">Raul Meireles</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Daniel_Agger" title="Daniel Agger">Daniel Agger</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/F%C3%A1bio_Aur%C3%A9lio" title="Fábio Aurélio">Fábio Aurélio</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Luis_Su%C3%A1rez_(Uruguyan_footballer)" title="Luis Suárez (Uruguyan footballer)" class="mw-redirect">Luis Suárez</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Steven_Gerrard" title="Steven Gerrard">Steven Gerrard</a></span> <i>(<a href="/wiki/Captain_(association_football)" title="Captain (association football)">captain</a>)</i></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Andy_Carroll" title="Andy Carroll">Andy Carroll</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Joe_Cole" title="Joe Cole">Joe Cole</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Maxi_Rodr%C3%ADguez" title="Maxi Rodríguez">Maxi Rodríguez</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Daniel_Pacheco" title="Daniel Pacheco">Daniel Pacheco</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Jordan_Henderson" title="Jordan Henderson">Jordan Henderson</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Alberto_Aquilani" title="Alberto Aquilani">Alberto Aquilani</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Dirk_Kuyt" title="Dirk Kuyt">Dirk Kuyt</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Stewart_Downing" title="Stewart Downing">Stewart Downing</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Jay_Spearing" title="Jay Spearing">Jay Spearing</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Lucas_Leiva" title="Lucas Leiva">Lucas Leiva</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Danny_Wilson_(Scottish_footballer)" title="Danny Wilson (Scottish footballer)">Danny Wilson</a></span></td> 
</tr> 

</table> 

</td> 

<td width="1%"></td> 
<td bgcolor="#FFFFFF" valign="top" width="48%"> 
<table border="0" cellspacing="0" cellpadding="2"> 

<tr bgcolor="#AAD0FF"> 
<th width="1%">No.</th> 

<th width="1%"></th> 
<th width="1%">Position</th> 
<th width="75%">Player</th> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Jamie_Carragher" title="Jamie Carragher">Jamie Carragher</a></span> <i>(<a href="/wiki/Captain_(association_football)#Vice-captain" title="Captain (association football)">vice-captain</a>)</i></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/David_N%27Gog" title="David N'Gog">David N'Gog</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Jos%C3%A9_Manuel_Reina" title="José Manuel Reina">Pepe Reina</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Charlie_Adam" title="Charlie Adam">Charlie Adam</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Christian_Poulsen" title="Christian Poulsen">Christian Poulsen</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn">Jesús Fernández Sáez (Suso)</span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Raheem_Sterling" title="Raheem Sterling">Raheem Sterling</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Doni%C3%A9ber_Alexander_Marangon" title="Doniéber Alexander Marangon">Doni</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Jonjo_Shelvey" title="Jonjo Shelvey">Jonjo Shelvey</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Martin_Kelly" title="Martin Kelly">Martin Kelly</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Conor_Coady" title="Conor Coady">Conor Coady</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Martin_%C5%A0krtel" title="Martin Škrtel">Martin Škrtel</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/John_Flanagan_(English_footballer)" title="John Flanagan (English footballer)">John Flanagan</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Nathan_Eccleston" title="Nathan Eccleston">Nathan Eccleston</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn">Andre Wisdom</span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Jack_Robinson_(footballer_born_1993)" title="Jack Robinson (footballer born 1993)">Jack Robinson</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/David_Amoo" title="David Amoo">David Amoo</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Philipp_Degen" title="Philipp Degen">Philipp Degen</a></span></td> 
</tr> 

<tr class="vcard agent"> 
<td><span class="fn"><a href="/wiki/Emiliano_Ins%C3%BAa" title="Emiliano Insúa">Emiliano Insúa</a></span></td> 
</tr> 

</table>'; 

$first = strpos($html, '<tr class="vcard agent">'); 
$result = substr($html, $first); 

echo $result; 

?> 

我想刪除

sdfknjasdf kjfdasj fjknadssajkndf kjadsknajsdfjndfasjk

<tr class="vcard agent">

Answer 1

逃避所有的單引號用反斜槓的第一次出現了。

實施例：

$html = '[...] <a href="/wiki/David_N%27Gog" title="David N'Gog">David N'Gog</a> [...]'; 

是不正確的，而

$html = '[...] <a href="/wiki/David_N%27Gog" title="David N\'Gog">David N\'Gog</a> [...]'; 

是正確的。

Answer 2

對於文本的大跨度，containign引號使用HEREDOC syntax：

$html = <<<EOT 
sdfknjasdf kjfdasj fjknadssajkndf kjadsknajsdfjndfasjk <tr class="vcard agent"> 
<span class="fn"><a href="/wiki/Brad_Jones_(footballer)" title="Brad Jones (footballer)">Brad Jones</a></span></td> 
</tr> 
EOT; 

Answer 3

查找...

<td><span class="fn"><a href="/wiki/David_N%27Gog" title="David N'Gog">David N'Gog</a></span></td> 

替換...

<td><span class="fn"><a href="/wiki/David_N%27Gog" title="David N\'Gog">David N\'Gog</a></span></td> 

你的代碼包含轉義單在兩個地方引用。