php-doc-en/reference/image/functions/imagerotate.xml

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<refentry xml:id="function.imagerotate" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>imagerotate</refname>
  <refpurpose>Rotate an image with a given angle</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>resource</type><methodname>imagerotate</methodname>
   <methodparam><type>resource</type><parameter>image</parameter></methodparam>
   <methodparam><type>float</type><parameter>angle</parameter></methodparam>
   <methodparam><type>int</type><parameter>bgd_color</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>ignore_transparent</parameter><initializer>0</initializer></methodparam>
  </methodsynopsis>
  <para>
   Rotates the <parameter>image</parameter> image using the given
   <parameter>angle</parameter> in degrees. 
  </para>
  <para>
   The center of rotation is the center of the image, and the rotated
   image may have different dimensions than the original image.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    &gd.image.description;
    <varlistentry>
     <term><parameter>angle</parameter></term>
     <listitem>
      <para>
       Rotation angle, in degrees. The rotation angle is interpreted as the
       number of degrees to rotate the image anticlockwise.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>bgd_color</parameter></term>
     <listitem>
      <para>
       Specifies the color of the uncovered zone after the rotation
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>ignore_transparent</parameter></term>
     <listitem>
      <para>
       If set and non-zero, transparent colors are ignored (otherwise kept).
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns an image resource for the rotated image, &return.falseforfailure;.
  </para>
 </refsect1>
 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>5.5.0</entry>
       <entry>
        The <parameter>ignore_transparent</parameter> is now silently ignored.
       </entry>
      </row>
      <row>
       <entry>5.5.0</entry>
       <entry>
        This function is now affected by the interpolation method set by the 
        <function>imagesetinterpolation</function> function.
       </entry>
      </row>
      <row>
       <entry>5.1.0</entry>
       <entry>
        <parameter>ignore_transparent</parameter> was added.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Rotate an image 180 degrees</title>
    <para>
     This example rotates an image 180 degrees - upside down.
    </para>
    <programlisting role="php">
<![CDATA[
<?php
// File and rotation
$filename = 'test.jpg';
$degrees = 180;

// Content type
header('Content-type: image/jpeg');

// Load
$source = imagecreatefromjpeg($filename);

// Rotate
$rotate = imagerotate($source, $degrees, 0);

// Output
imagejpeg($rotate);

// Free the memory
imagedestroy($source);
imagedestroy($rotate);
?>
]]>
    </programlisting>
    &example.outputs.similar;
    <mediaobject>
     <alt>Output of example : Rotate an image 180 degrees</alt>
     <imageobject>
      <imagedata fileref="en/reference/image/figures/imagerotate.jpg"/>
     </imageobject>
    </mediaobject>
   </example>
  </para>
 </refsect1>
 <refsect1 role="notes">
  &reftitle.notes;
  &note.gd.interpolation;
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>imagesetinterpolation</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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