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【PHP】检查URL是否存在或有效
作者:Dezai.CN / 发布于2011/6/11/ 547
<div>
<div style="font-family: monospace" class="php"><span style="color: rgb(0,0,0); font-weight: bold"><?php</span>

<span style="color: rgb(0,0,0); font-weight: bold">function</span> is_valid_url<span style="color: rgb(102,204,102)">(</span><span style="color: rgb(0,0,255)">$url</span><span style="color: rgb(102,204,102)">)</span>
<span style="color: rgb(102,204,102)">{</span>
<span style="color: rgb(0,0,255)">$url</span> = @<a href="http://www.php.net/parse_url" target="_blank"><span style="color: rgb(0,0,102)">parse_url</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(0,0,255)">$url</span><span style="color: rgb(102,204,102)">)</span>;

<span style="color: rgb(177,177,0)">if</span> <span style="color: rgb(102,204,102)">(</span>!<span style="color: rgb(0,0,255)">$url</span><span style="color: rgb(102,204,102)">)</span>
<span style="color: rgb(102,204,102)">{</span>
<span style="color: rgb(177,177,0)">return</span> <span style="color: rgb(0,0,0); font-weight: bold">false</span>;
<span style="color: rgb(102,204,102)">}</span>

<span style="color: rgb(0,0,255)">$url</span> = <a href="http://www.php.net/array_map" target="_blank"><span style="color: rgb(0,0,102)">array_map</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(255,0,0)">'trim'</span>, <span style="color: rgb(0,0,255)">$url</span><span style="color: rgb(102,204,102)">)</span>;
<span style="color: rgb(0,0,255)">$url</span><span style="color: rgb(102,204,102)">[</span><span style="color: rgb(255,0,0)">'port'</span><span style="color: rgb(102,204,102)">]</span> = <span style="color: rgb(102,204,102)">(</span>!<a href="http://www.php.net/isset" target="_blank"><span style="color: rgb(0,0,102)">isset</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(0,0,255)">$url</span><span style="color: rgb(102,204,102)">[</span><span style="color: rgb(255,0,0)">'port'</span><span style="color: rgb(102,204,102)">]</span><span style="color: rgb(102,204,102)">)</span><span style="color: rgb(102,204,102)">)</span> ? <span style="color: rgb(204,102,204)">80</span> : <span style="color: rgb(102,204,102)">(</span>int<span style="color: rgb(102,204,102)">)</span><span style="color: rgb(0,0,255)">$url</span><span style="color: rgb(102,204,102)">[</span><span style="color: rgb(255,0,0)">'port'</span><span style="color: rgb(102,204,102)">]</span>;
<span style="color: rgb(0,0,255)">$path</span> = <span style="color: rgb(102,204,102)">(</span><a href="http://www.php.net/isset" target="_blank"><span style="color: rgb(0,0,102)">isset</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(0,0,255)">$url</span><span style="color: rgb(102,204,102)">[</span><span style="color: rgb(255,0,0)">'path'</span><span style="color: rgb(102,204,102)">]</span><span style="color: rgb(102,204,102)">)</span><span style="color: rgb(102,204,102)">)</span> ? <span style="color: rgb(0,0,255)">$url</span><span style="color: rgb(102,204,102)">[</span><span style="color: rgb(255,0,0)">'path'</span><span style="color: rgb(102,204,102)">]</span> : <span style="color: rgb(255,0,0)">''</span>;

<span style="color: rgb(177,177,0)">if</span> <span style="color: rgb(102,204,102)">(</span><span style="color: rgb(0,0,255)">$path</span> == <span style="color: rgb(255,0,0)">''</span><span style="color: rgb(102,204,102)">)</span>
<span style="color: rgb(102,204,102)">{</span>
<span style="color: rgb(0,0,255)">$path</span> = <span style="color: rgb(255,0,0)">'/'</span>;
<span style="color: rgb(102,204,102)">}</span>

<span style="color: rgb(0,0,255)">$path</span> .= <span style="color: rgb(102,204,102)">(</span><a href="http://www.php.net/isset" target="_blank"><span style="color: rgb(0,0,102)">isset</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(0,0,255)">$url</span><span style="color: rgb(102,204,102)">[</span><span style="color: rgb(255,0,0)">'query'</span><span style="color: rgb(102,204,102)">]</span><span style="color: rgb(102,204,102)">)</span><span style="color: rgb(102,204,102)">)</span> ? <span style="color: rgb(255,0,0)">"?$url[query]"</span> : <span style="color: rgb(255,0,0)">''</span>;

<span style="color: rgb(177,177,0)">if</span> <span style="color: rgb(102,204,102)">(</span><a href="http://www.php.net/isset" target="_blank"><span style="color: rgb(0,0,102)">isset</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(0,0,255)">$url</span><span style="color: rgb(102,204,102)">[</span><span style="color: rgb(255,0,0)">'host'</span><span style="color: rgb(102,204,102)">]</span><span style="color: rgb(102,204,102)">)</span> AND <span style="color: rgb(0,0,255)">$url</span><span style="color: rgb(102,204,102)">[</span><span style="color: rgb(255,0,0)">'host'</span><span style="color: rgb(102,204,102)">]</span> != <a href="http://www.php.net/gethostbyname" target="_blank"><span style="color: rgb(0,0,102)">gethostbyname</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(0,0,255)">$url</span><span style="color: rgb(102,204,102)">[</span><span style="color: rgb(255,0,0)">'host'</span><span style="color: rgb(102,204,102)">]</span><span style="color: rgb(102,204,102)">)</span><span style="color: rgb(102,204,102)">)</span>
<span style="color: rgb(102,204,102)">{</span>
<span style="color: rgb(177,177,0)">if</span> <span style="color: rgb(102,204,102)">(</span><span style="color: rgb(0,0,0); font-weight: bold">PHP_VERSION</span> >= <span style="color: rgb(204,102,204)">5</span><span style="color: rgb(102,204,102)">)</span>
<span style="color: rgb(102,204,102)">{</span>
<span style="color: rgb(0,0,255)">$headers</span> = get_headers<span style="color: rgb(102,204,102)">(</span><span style="color: rgb(255,0,0)">"$url[scheme]://$url[host]:$url[port]$path"</span><span style="color: rgb(102,204,102)">)</span>;
<span style="color: rgb(102,204,102)">}</span>
<span style="color: rgb(177,177,0)">else</span>
<span style="color: rgb(102,204,102)">{</span>
<span style="color: rgb(0,0,255)">$fp</span> = <a href="http://www.php.net/fsockopen" target="_blank"><span style="color: rgb(0,0,102)">fsockopen</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(0,0,255)">$url</span><span style="color: rgb(102,204,102)">[</span><span style="color: rgb(255,0,0)">'host'</span><span style="color: rgb(102,204,102)">]</span>, <span style="color: rgb(0,0,255)">$url</span><span style="color: rgb(102,204,102)">[</span><span style="color: rgb(255,0,0)">'port'</span><span style="color: rgb(102,204,102)">]</span>, <span style="color: rgb(0,0,255)">$errno</span>, <span style="color: rgb(0,0,255)">$errstr</span>, <span style="color: rgb(204,102,204)">30</span><span style="color: rgb(102,204,102)">)</span>;

<span style="color: rgb(177,177,0)">if</span> <span style="color: rgb(102,204,102)">(</span>!<span style="color: rgb(0,0,255)">$fp</span><span style="color: rgb(102,204,102)">)</span>
<span style="color: rgb(102,204,102)">{</span>
<span style="color: rgb(177,177,0)">return</span> <span style="color: rgb(0,0,0); font-weight: bold">false</span>;
<span style="color: rgb(102,204,102)">}</span>
<a href="http://www.php.net/fputs" target="_blank"><span style="color: rgb(0,0,102)">fputs</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(0,0,255)">$fp</span>, <span style="color: rgb(255,0,0)">"HEAD $path HTTP/1.1<span style="color: rgb(0,0,153); font-weight: bold">\r</span><span style="color: rgb(0,0,153); font-weight: bold">\n</span>Host: $url[host]<span style="color: rgb(0,0,153); font-weight: bold">\r</span><span style="color: rgb(0,0,153); font-weight: bold">\n</span><span style="color: rgb(0,0,153); font-weight: bold">\r</span><span style="color: rgb(0,0,153); font-weight: bold">\n</span>"</span><span style="color: rgb(102,204,102)">)</span>;
<span style="color: rgb(0,0,255)">$headers</span> = <a href="http://www.php.net/fread" target="_blank"><span style="color: rgb(0,0,102)">fread</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(0,0,255)">$fp</span>, <span style="color: rgb(204,102,204)">4096</span><span style="color: rgb(102,204,102)">)</span>;
<a href="http://www.php.net/fclose" target="_blank"><span style="color: rgb(0,0,102)">fclose</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(0,0,255)">$fp</span><span style="color: rgb(102,204,102)">)</span>;
<span style="color: rgb(102,204,102)">}</span>
<span style="color: rgb(0,0,255)">$headers</span> = <span style="color: rgb(102,204,102)">(</span><a href="http://www.php.net/is_array" target="_blank"><span style="color: rgb(0,0,102)">is_array</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(0,0,255)">$headers</span><span style="color: rgb(102,204,102)">)</span><span style="color: rgb(102,204,102)">)</span> ? <a href="http://www.php.net/implode" target="_blank"><span style="color: rgb(0,0,102)">implode</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(255,0,0)">"<span style="color: rgb(0,0,153); font-weight: bold">\n</span>"</span>, <span style="color: rgb(0,0,255)">$headers</span><span style="color: rgb(102,204,102)">)</span> : <span style="color: rgb(0,0,255)">$headers</span>;
<span style="color: rgb(177,177,0)">return</span> <span style="color: rgb(102,204,102)">(</span>bool<span style="color: rgb(102,204,102)">)</span><a href="http://www.php.net/preg_match" target="_blank"><span style="color: rgb(0,0,102)">preg_match</span></a><span style="color: rgb(102,204,102)">(</span><span style="color: rgb(255,0,0)">'#^HTTP/.*<span style="color: rgb(0,0,153); font-weight: bold">\s</span>+[(200|301|302)]+<span style="color: rgb(0,0,153); font-weight: bold">\s</span>#i'</span>, <span style="color: rgb(0,0,255)">$headers</span><span style="color: rgb(102,204,102)">)</span>;
<span style="color: rgb(102,204,102)">}</span>
<span style="color: rgb(177,177,0)">return</span> <span style="color: rgb(0,0,0); font-weight: bold">false</span>;
<span style="color: rgb(102,204,102)">}</span>

<span style="color: rgb(0,0,0); font-weight: bold">?></span></div>
<div style="font-family: monospace" class="php"><span style="color: rgb(0,0,0); font-weight: bold"><?php</span>

<span style="color: rgb(177,177,0)">if</span> <span style="color: rgb(102,204,102)">(</span>is_valid_url<span style="color: rgb(102,204,102)">(</span><span style="color: rgb(255,0,0)">'http://www.dezai.cn/</span><span style="color: rgb(102,204,102)">)</span><span style="color: rgb(102,204,102)">)</span>
<span style="color: rgb(102,204,102)">{</span>
do_something<span style="color: rgb(102,204,102)">(</span><span style="color: rgb(102,204,102)">)</span>;
<span style="color: rgb(102,204,102)">}</span>

<span style="color: rgb(0,0,0); font-weight: bold">?></span></div>
</div>
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