php爬虫代码（爬去我的OJ题库为例）
<?php
for ($i=1000;;$i++){
$url = "http://localhost/JudgeOnline/problem.php?pid=$i"; //这儿填OJ地址
$info=file_get_contents($url);
preg_match(‘|<title>(.*?)<\/title>|i‘,$info,$m); //获取标题
$title[$i][1]=$m[1];
if (!$m[1]) break; //如果没有标题，说明这题不存在，可以跳过
preg_match(‘|<h1 class="text-center">(.*?)<\/h1>|i‘,$info,$m); //获取题目标题信息
$title[$i][1]=$m[1];
}
echo "A total of ";
echo $pnum=$i-1000; //题目总数
echo " problems<br>";
?>
<?php
for ($i=1000;$i<=(999+$pnum);$i++){
$fh= file_get_contents("http://localhost/JudgeOnline/problem.php?pid=$i");
//echo $fh;
echo "Get P$i ";
echo ‘"‘;
echo $title[$i][1];
echo ‘"<br>‘;
unlink("$i.html");
$myfile = fopen("$i.html", "w"); //存放文件至 题目编号.html
fwrite($myfile, $fh);
fclose($myfile);
}
?>
网页端运行结果：
A total of 21 problems
Get P1000 "1000 : A+B问题"
Get P1001 "1001 : 求累加和"
Get P1002 "1002 : n的阶乘"
Get P1003 "1003 : 阶乘和"
Get P1004 "1004 : 第k小整数"
Get P1005 "1005 : 求a/b的高精度值"
Get P1006 "1006 : 麦森数mason"
Get P1007 "1007 : 旅行"
Get P1008 "1008 : 团伙(team)"
Get P1009 "1009 : 打击犯罪"
Get P1010 "1010 : 家谱(gen)"
Get P1011 "1011 : 搭配购买"
Get P1012 "1012 : 合并果子"
Get P1013 "1013 : 编辑距离"
Get P1014 "1014 : 奖学金"
Get P1015 "1015 : 过河卒"
Get P1016 "1016 : Hello World"
Get P1017 "1017 : 计算器大法好……"
Get P1018 "1018 : 测试题目"
Get P1019 "1019 : 度熊的全1串"
Get P1020 "1020 : 快速排序"
截取1000.html结果：
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<li><a href="hindex.php">首页</a></li>
<li><a href="problemset.php">题库</a></li>
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<h1 class="text-center">1000 : A+B问题</h1>
<p class="text-center">
时间限制:<span class="label label-primary">1 Sec</span>
内存限制:<span class="label label-primary">256 MiB</span><br/>
提交:<span class="label label-info">8</span>
答案正确:<span class="label label-success">5</span>
</p>
<p class="text-center">
<a id="oj-p-submit" class="btn btn-primary" href="./problemsubmit.php?pid=1000" role="button">提交</a>
<a class="btn btn-primary" href="./problemstatistics.php?pid=1000" role="button">状态</a>
<a class="btn btn-primary" href="./discuss.php?pid=1000" role="button">论坛</a> <!--<a class="btn btn-primary" href="" role="button">题解</a>-->
</p>
<h3><a data-toggle="collapse" data-target="#problemDesc">题目描述</a></h3>
<div class="collapse in" id="problemDesc" aria-expanded="true">
<pre><p>计算A+B的值（A，B，A+B<=2147483647)</p></pre>
</div>
<h3><a data-toggle="collapse" data-target="#problemInput">输入</a></h3>
<div class="collapse in" id="problemInput" aria-expanded="true">
<pre><p>两个整数A和B<br></p></pre>
</div>
<h3><a data-toggle="collapse" data-target="#problemOut">输出</a></h3>
<div class="collapse in" id="problemOut" aria-expanded="true">
<pre><p>输出A+B</p></pre>
</div>
<h3 id="bl-p-datain"><a data-toggle="collapse" data-target="#dataIn">样例输入</a></h3>
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<div class="zero-clipboard">
<span id="bl-p-copy" class="btn-clipboard" onclick="copyToClipboard(document.getElementById(‘dataInContent‘).innerHTML);">复制</span>
</div>
<pre id="dataInContent">1 2</pre>
</div>
<h3><a data-toggle="collapse" data-target="#dataOut">样例输出</a></h3>
<div class="collapse in" id="dataOut" aria-expanded="true">
<div class="zero-clipboard">
<span class="btn-clipboard" onclick="copyToClipboard(document.getElementById(‘dataOutContent‘).innerHTML);">复制</span>
</div>
<pre id="dataOutContent">3</pre>
</div>
<h3><a data-toggle="collapse" data-target="#problemHint">提示</a></h3>
<div class="collapse" id="problemHint" aria-expanded="true">
<pre></pre>
</div>
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<h3><a data-toggle="collapse" data-target="#problemSrc">标签</a></h3>
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<pre>初级</pre>
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所以php也是能搞爬虫的
