<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Convert a number between arbitrary bases</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.atanh.html">atanh</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.bindec.html">bindec</a></div> <div class="up"><a href="ref.math.html">Math Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="function.base-convert" class="refentry"> <div class="refnamediv"> <h1 class="refname">base_convert</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">base_convert</span> — <span class="dc-title">Convert a number between arbitrary bases</span></p> </div> <div class="refsect1 description" id="refsect1-function.base-convert-description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">string</span> <span class="methodname"><strong>base_convert</strong></span> ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$number</code></span> , <span class="methodparam"><span class="type">int</span> <code class="parameter">$frombase</code></span> , <span class="methodparam"><span class="type">int</span> <code class="parameter">$tobase</code></span> )</div> <p class="para rdfs-comment"> Returns a string containing <em><code class="parameter">number</code></em> represented in base <em><code class="parameter">tobase</code></em>. The base in which <em><code class="parameter">number</code></em> is given is specified in <em><code class="parameter">frombase</code></em>. Both <em><code class="parameter">frombase</code></em> and <em><code class="parameter">tobase</code></em> have to be between 2 and 36, inclusive. Digits in numbers with a base higher than 10 will be represented with the letters a-z, with a meaning 10, b meaning 11 and z meaning 35. </p> <div class="warning"><strong class="warning">Warning</strong> <p class="simpara"> <span class="function"><strong>base_convert()</strong></span> may lose precision on large numbers due to properties related to the internal "double" or "float" type used. Please see the <a href="language.types.float.html" class="link">Floating point numbers</a> section in the manual for more specific information and limitations. </p> </div> </div> <div class="refsect1 parameters" id="refsect1-function.base-convert-parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><em><code class="parameter">number</code></em></span> <dd> <p class="para"> The number to convert </p> </dd> </dt> <dt> <span class="term"><em><code class="parameter">frombase</code></em></span> <dd> <p class="para"> The base <em><code class="parameter">number</code></em> is in </p> </dd> </dt> <dt> <span class="term"><em><code class="parameter">tobase</code></em></span> <dd> <p class="para"> The base to convert <em><code class="parameter">number</code></em> to </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues" id="refsect1-function.base-convert-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> <em><code class="parameter">number</code></em> converted to base <em><code class="parameter">tobase</code></em> </p> </div> <div class="refsect1 examples" id="refsect1-function.base-convert-examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example" id="example-3448"> <p><strong>Example #1 <span class="function"><strong>base_convert()</strong></span> example</strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br />$hexadecimal </span><span style="color: #007700">= </span><span style="color: #DD0000">'A37334'</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">base_convert</span><span style="color: #007700">(</span><span style="color: #0000BB">$hexadecimal</span><span style="color: #007700">, </span><span style="color: #0000BB">16</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents screen"> <div class="cdata"><pre> 101000110111001100110100 </pre></div> </div> </div> </p> </div> <div class="refsect1 seealso" id="refsect1-function.base-convert-seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"> <span class="function"><a href="function.intval.html" class="function" rel="rdfs-seeAlso">intval()</a> - Get the integer value of a variable</span></li> </ul> </p> </div> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.atanh.html">atanh</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.bindec.html">bindec</a></div> <div class="up"><a href="ref.math.html">Math Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>