function.ip2long.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Converts a string containing an (IPv4) Internet Protocol dotted address into a proper address</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.inet-pton.html">inet_pton</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.long2ip.html">long2ip</a></div> <div class="up"><a href="ref.network.html">Network Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.ip2long" class="refentry"> <div class="refnamediv"> <h1 class="refname">ip2long</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">ip2long</span> — <span class="dc-title">Converts a string containing an (IPv4) Internet Protocol dotted address into a proper address</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">int</span> <span class="methodname"><b><b>ip2long</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$ip_address</tt></span> )</div> <p class="para rdfs-comment"> The function <b>ip2long()</b> generates an IPv4 Internet network address from its Internet standard format (dotted string) representation. </p> <p class="para"> <b>ip2long()</b> will also work with non-complete IP addresses. Read <a href="http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/libs/commtrf2/inet_addr.htm" class="link external">» http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/libs/commtrf2/inet_addr.htm</a> for more info. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">ip_address</tt></i></span> <dd> <p class="para"> A standard format address. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns the IPv4 address or <b><tt>FALSE</tt></b> if <i><tt class="parameter">ip_address</tt></i> is invalid. </p> </div> <div class="refsect1 changelog"> <h3 class="title">ChangeLog</h3> <p class="para"> <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Version</th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">5.0.0</td> <td colspan="1" rowspan="1" align="left"> Prior to this version, <b>ip2long()</b> returned -1 on failure. </td> </tr> </tbody> </colgroup> </table> </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>ip2long()</b> Example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$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">$out</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> <p class="para"> <div class="example"> <p><b>Example #2 Displaying an IP address</b></p> <div class="example-contents"><p> This second example shows how to print a converted address with the <a href="function.printf.html" class="function">printf()</a> function in both PHP 4 and PHP 5: </p></div> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$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">$ip</span><span style="color: #007700">)); </span><span style="color: #FF8000">// 3221234342<br /></span><span style="color: #007700">}<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> <p class="para"> <div class="example"> <p><b>Example #3 IP validation</b></p> <div class="example-contents"><p> <b>ip2long()</b> should not be used as the sole form of IP validation. Combine it with <a href="function.long2ip.html" class="function">long2ip()</a>: </p></div> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// make sure IPs are valid. also converts a non-complete IP into<br />// a proper dotted quad as explained below.<br /></span><span style="color: #0000BB">$ip </span><span style="color: #007700">= </span><span style="color: #0000BB">long2ip</span><span style="color: #007700">(</span><span style="color: #0000BB">ip2long</span><span style="color: #007700">(</span><span style="color: #DD0000">"127.0.0.1"</span><span style="color: #007700">)); </span><span style="color: #FF8000">// "127.0.0.1"<br /></span><span style="color: #0000BB">$ip </span><span style="color: #007700">= </span><span style="color: #0000BB">long2ip</span><span style="color: #007700">(</span><span style="color: #0000BB">ip2long</span><span style="color: #007700">(</span><span style="color: #DD0000">"10.0.0"</span><span style="color: #007700">)); </span><span style="color: #FF8000">// "10.0.0.0"<br /></span><span style="color: #0000BB">$ip </span><span style="color: #007700">= </span><span style="color: #0000BB">long2ip</span><span style="color: #007700">(</span><span style="color: #0000BB">ip2long</span><span style="color: #007700">(</span><span style="color: #DD0000">"10.0.256"</span><span style="color: #007700">)); </span><span style="color: #FF8000">// "10.0.1.0"<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: Because PHP's integer type is signed, and many IP addresses will result in negative integers, you need to use the "%u" formatter of <a href="function.sprintf.html" class="function">sprintf()</a> or <a href="function.printf.html" class="function">printf()</a> to get the string representation of the unsigned IP address. <br /> </p></blockquote> <blockquote><p><b class="note">Note</b>: <b>ip2long()</b> will return <b><tt>FALSE</tt></b> for the IP <i>255.255.255.255</i> in PHP 5 <= 5.0.2. It was fixed in PHP 5.0.3 where it returns <i>-1</i> (same as PHP 4). <br /> </p></blockquote> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.long2ip.html" class="function" rel="rdfs-seeAlso">long2ip()</a></li> <li class="member"><a href="function.sprintf.html" class="function" rel="rdfs-seeAlso">sprintf()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.inet-pton.html">inet_pton</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.long2ip.html">long2ip</a></div> <div class="up"><a href="ref.network.html">Network Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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