function.imagerotate.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>Rotate an image with a given angle</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.imagerectangle.html">imagerectangle</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.imagesavealpha.html">imagesavealpha</a></div> <div class="up"><a href="ref.image.html">GD Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.imagerotate" class="refentry"> <div class="refnamediv"> <h1 class="refname">imagerotate</h1> <p class="verinfo">(PHP 4 >= 4.3.0, PHP 5)</p><p class="refpurpose"><span class="refname">imagerotate</span> — <span class="dc-title">Rotate an image with a given angle</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">resource</span> <span class="methodname"><b><b>imagerotate</b></b></span> ( <span class="methodparam"><span class="type">resource</span> <tt class="parameter">$image</tt></span> , <span class="methodparam"><span class="type">float</span> <tt class="parameter">$angle</tt></span> , <span class="methodparam"><span class="type">int</span> <tt class="parameter">$bgd_color</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$ignore_transparent</tt></span> ] )</div> <p class="para rdfs-comment"> Rotates the <i><tt class="parameter">image</tt></i> image using the given <i><tt class="parameter">angle</tt></i> in degrees. </p> <p class="para"> The center of rotation is the center of the image, and the rotated image is scaled down so that the whole rotated image fits in the destination image - the edges are not clipped. </p> <p class="para"> </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt><span class="term"><i><tt class="parameter">image</tt></i></span><dd><p class="para">An image resource, returned by one of the image creation functions, such as <a href="function.imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a>.</p></dd></dt> <dt> <span class="term"><i><tt class="parameter">angle</tt></i></span> <dd> <p class="para"> Rotation angle, in degrees. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">bgd_color</tt></i></span> <dd> <p class="para"> Specifies the color of the uncovered zone after the rotation </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">ignore_transparent</tt></i></span> <dd> <p class="para"> If set and non-zero, transparent colors are ignored (otherwise kept). </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> </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">5.1.0</td> <td colspan="1" rowspan="1" align="left"> <i><tt class="parameter">ignore_transparent</tt></i> was added. </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 Rotate an image 180 degrees</b></p> <div class="example-contents"><p> This example rotates an image 180 degrees - upside down. </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">// File and rotation<br /></span><span style="color: #0000BB">$filename </span><span style="color: #007700">= </span><span style="color: #DD0000">'test.jpg'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$degrees </span><span style="color: #007700">= </span><span style="color: #0000BB">180</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// Content type<br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">'Content-type: image/jpeg'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Load<br /></span><span style="color: #0000BB">$source </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatefromjpeg</span><span style="color: #007700">(</span><span style="color: #0000BB">$filename</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Rotate<br /></span><span style="color: #0000BB">$rotate </span><span style="color: #007700">= </span><span style="color: #0000BB">imagerotate</span><span style="color: #007700">(</span><span style="color: #0000BB">$source</span><span style="color: #007700">, </span><span style="color: #0000BB">$degrees</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Output<br /></span><span style="color: #0000BB">imagejpeg</span><span style="color: #007700">(</span><span style="color: #0000BB">$rotate</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 something similar to:</p></div> <div class="mediaobject"> <div class="imageobject"> <img src="figures/image.imagerotate.jpg" /> </div> </div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: <span class="simpara">This function is only available ifPHP is compiled with the bundled version of the GD library.</span></p></blockquote> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.imagerectangle.html">imagerectangle</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.imagesavealpha.html">imagesavealpha</a></div> <div class="up"><a href="ref.image.html">GD 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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