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165 lines
9.5 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>将 IPV4 的字符串互联网协议转换成长整型数字</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.ip2long" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">ip2long</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">ip2long</span> — <span class="dc-title">将 IPV4 的字符串互联网协议转换成长整型数字</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.ip2long-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>ip2long</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$ip_address</code></span>
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) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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函数 <span class="function"><strong>ip2long()</strong></span> 返回 IPV4 网络地址的长整型格式，从标准网络地址格式(点字符串)转化得到。
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</p>
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<p class="para">
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<span class="function"><strong>ip2long()</strong></span> 还可以与非完整IP进行工作。
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阅读 <a href="http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/libs/commtrf2/inet_addr.htm" class="link external">» http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/libs/commtrf2/inet_addr.htm</a>
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获得更多信息。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.ip2long-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">ip_address</code></dt>
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<dd>
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<p class="para">
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一个标准格式的地址。
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.ip2long-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回IP地址转换后的数字 或 <strong><code>FALSE</code></strong> 如果 <code class="parameter">ip_address</code>
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是无效的。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.ip2long-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>5.5.0</td>
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<td>
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Prior to this version, on Windows <span class="function"><strong>ip2long()</strong></span> would sometimes return
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a valid number even if passed a value which was not an (IPv4) Internet Protocol
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dotted address.
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</td>
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</tr>
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<tr>
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<td>5.2.10</td>
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<td>
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再此之前的版本, <span class="function"><strong>ip2long()</strong></span> 有时会返回即使这不是一个IPV4的标准地址的数字地址。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.ip2long-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-5501">
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<p><strong>Example #1 <span class="function"><strong>ip2long()</strong></span> 例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$ip </span><span style="color: #007700">= </span><span style="color: #0000BB">gethostbyname</span><span style="color: #007700">(</span><span style="color: #DD0000">'www.example.com'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$out </span><span style="color: #007700">= </span><span style="color: #DD0000">"The following URLs are equivalent:<br />\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$out </span><span style="color: #007700">.= </span><span style="color: #DD0000">'http://www.example.com/, http://' </span><span style="color: #007700">. </span><span style="color: #0000BB">$ip </span><span style="color: #007700">. </span><span style="color: #DD0000">'/, and http://' </span><span style="color: #007700">. </span><span style="color: #0000BB">sprintf</span><span style="color: #007700">(</span><span style="color: #DD0000">"%u"</span><span style="color: #007700">, </span><span style="color: #0000BB">ip2long</span><span style="color: #007700">(</span><span style="color: #0000BB">$ip</span><span style="color: #007700">)) . </span><span style="color: #DD0000">"/<br />\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">$out</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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<p class="para">
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<div class="example" id="example-5502">
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<p><strong>Example #2 显示IP地址</strong></p>
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<div class="example-contents"><p>
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第二个例子说明打印一个转换后的地址使用
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<span class="function"><a href="printf.html" class="function">printf()</a></span> 在PHP4和PHP5的功能:
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</p></div>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$ip </span><span style="color: #007700">= </span><span style="color: #0000BB">gethostbyname</span><span style="color: #007700">(</span><span style="color: #DD0000">'www.example.com'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$long </span><span style="color: #007700">= </span><span style="color: #0000BB">ip2long</span><span style="color: #007700">(</span><span style="color: #0000BB">$ip</span><span style="color: #007700">);<br /><br />if (</span><span style="color: #0000BB">$long </span><span style="color: #007700">== -</span><span style="color: #0000BB">1 </span><span style="color: #007700">|| </span><span style="color: #0000BB">$long </span><span style="color: #007700">=== </span><span style="color: #0000BB">FALSE</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">'Invalid IP, please try again'</span><span style="color: #007700">;<br />} else {<br /> echo </span><span style="color: #0000BB">$ip </span><span style="color: #007700">. </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">; </span><span style="color: #FF8000">// 192.0.34.166<br /> </span><span style="color: #007700">echo </span><span style="color: #0000BB">$long </span><span style="color: #007700">. </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">; </span><span style="color: #FF8000">// -1073732954<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"%u\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">ip2long</span><span style="color: #007700">(</span><span style="color: #0000BB">$ip</span><span style="color: #007700">)); </span><span style="color: #FF8000">// 3221234342<br /></span><span style="color: #007700">}<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.ip2long-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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因为PHP的 <span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span> 类型是有符号，并且有许多的IP地址讲导致在32位系统的情况下为负数， 你需要使用 "%u" 进行转换通过 <span class="function"><a href="sprintf.html" class="function">sprintf()</a></span> 或
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<span class="function"><a href="printf.html" class="function">printf()</a></span> 得到的字符串来表示无符号的IP地址。
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</p>
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</p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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<span class="function"><strong>ip2long()</strong></span> 将返回 <strong><code>FALSE</code></strong> 在IP是
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<em>255.255.255.255</em> 的情况，版本为 PHP 5 <= 5.0.2. 在修复后
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PHP 5.0.3 会返回 <em>-1</em> (与PHP4相同).
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.ip2long-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="long2ip.html" class="function" rel="rdfs-seeAlso">long2ip()</a> - 将长整型转化为字符串形式带点的互联网标准格式地址（IPV4）</span></li>
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<li class="member"><span class="function"><a href="sprintf.html" class="function" rel="rdfs-seeAlso">sprintf()</a> - Return a formatted string</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |