<!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>Sine</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.round.html">round</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.sinh.html">sinh</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.sin" class="refentry"> <div class="refnamediv"> <h1 class="refname">sin</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">sin</span> — <span class="dc-title">Sine</span></p> </div> <div class="refsect1 description" id="refsect1-function.sin-description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">float</span> <span class="methodname"><strong>sin</strong></span> ( <span class="methodparam"><span class="type">float</span> <code class="parameter">$arg</code></span> )</div> <p class="para rdfs-comment"> <span class="function"><strong>sin()</strong></span> returns the sine of the <em><code class="parameter">arg</code></em> parameter. The <em><code class="parameter">arg</code></em> parameter is in radians. </p> </div> <div class="refsect1 parameters" id="refsect1-function.sin-parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><em><code class="parameter">arg</code></em></span> <dd> <p class="para"> A value in radians </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues" id="refsect1-function.sin-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> The sine of <em><code class="parameter">arg</code></em> </p> </div> <div class="refsect1 examples" id="refsect1-function.sin-examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example" id="example-3477"> <p><strong>Example #1 <span class="function"><strong>sin()</strong></span> example</strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br /><br /></span><span style="color: #FF8000">// Precision depends on your precision directive<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">sin</span><span style="color: #007700">(</span><span style="color: #0000BB">deg2rad</span><span style="color: #007700">(</span><span style="color: #0000BB">60</span><span style="color: #007700">)); </span><span style="color: #FF8000">// 0.866025403 ...<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">sin</span><span style="color: #007700">(</span><span style="color: #0000BB">60</span><span style="color: #007700">); </span><span style="color: #FF8000">// -0.304810621 ...<br /><br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> </div> </p> </div> <div class="refsect1 seealso" id="refsect1-function.sin-seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"> <span class="function"><a href="function.asin.html" class="function" rel="rdfs-seeAlso">asin()</a> - Arc sine</span></li> <li class="member"> <span class="function"><a href="function.sinh.html" class="function" rel="rdfs-seeAlso">sinh()</a> - Hyperbolic sine</span></li> <li class="member"> <span class="function"><a href="function.cos.html" class="function" rel="rdfs-seeAlso">cos()</a> - Cosine</span></li> <li class="member"> <span class="function"><a href="function.tan.html" class="function" rel="rdfs-seeAlso">tan()</a> - Tangent</span></li> <li class="member"> <span class="function"><a href="function.deg2rad.html" class="function" rel="rdfs-seeAlso">deg2rad()</a> - Converts the number in degrees to the radian equivalent</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.round.html">round</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.sinh.html">sinh</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>