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

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<refentry xml:id="function.imageflip" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>imageflip</refname>
  <refpurpose>Flips an image using a given mode</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>imageflip</methodname>
   <methodparam><type>GdImage</type><parameter>image</parameter></methodparam>
   <methodparam><type>int</type><parameter>mode</parameter></methodparam>
  </methodsynopsis>
  <para>
   Flips the <parameter>image</parameter> image using the given
   <parameter>mode</parameter>. 
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    &gd.image.description;
    <varlistentry>
     <term><parameter>mode</parameter></term>
     <listitem>
      <para>
       Flip mode, this can be one of the <constant>IMG_FLIP_*</constant> constants:
      </para>
      <para>
       <informaltable>
        <tgroup cols="2">
         <thead>
          <row>
           <entry>Constant</entry>
           <entry>Meaning</entry>
          </row>
         </thead>
         <tbody>
          <row>
           <entry><constant>IMG_FLIP_HORIZONTAL</constant></entry>
           <entry>
            Flips the image horizontally.
           </entry>
          </row>
          <row>
           <entry><constant>IMG_FLIP_VERTICAL</constant></entry>
           <entry>
            Flips the image vertically.
           </entry>
          </row>
          <row>
           <entry><constant>IMG_FLIP_BOTH</constant></entry>
           <entry>
            Flips the image both horizontally and vertically.
           </entry>
          </row>
         </tbody>
        </tgroup>
       </informaltable>
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     &gd.changelog.image-param;
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Flips an image vertically</title>
    <para>
     This example uses the <constant>IMG_FLIP_VERTICAL</constant> 
     constant.
    </para>
    <programlisting role="php">
<![CDATA[
<?php
// File
$filename = 'phplogo.png';

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

// Load
$im = imagecreatefrompng($filename);

// Flip it vertically
imageflip($im, IMG_FLIP_VERTICAL);

// Output
imagejpeg($im);
imagedestroy($im);
?>
]]>
    </programlisting>
    &example.outputs.similar;
    <mediaobject>
     <alt>Output of example: Vertically flipped image</alt>
     <imageobject>
      <imagedata fileref="en/reference/image/figures/imageflipvertical.png"/>
     </imageobject>
    </mediaobject>
   </example>
  </para>
  <para>
   <example>
    <title>Flips the image horizontally</title>
    <para>
     This example uses the <constant>IMG_FLIP_HORIZONTAL</constant> constant.
    </para>
    <programlisting role="php">
<![CDATA[
<?php
// File
$filename = 'phplogo.png';

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

// Load
$im = imagecreatefrompng($filename);

// Flip it horizontally
imageflip($im, IMG_FLIP_HORIZONTAL);

// Output
imagejpeg($im);
imagedestroy($im);
?>
]]>
    </programlisting>
    &example.outputs.similar;
    <mediaobject>
     <alt>Output of example: Horizontally flipped image</alt>
     <imageobject>
      <imagedata fileref="en/reference/image/figures/imagefliphorizontal.png"/>
     </imageobject>
    </mediaobject>
   </example>
  </para>
 </refsect1>

</refentry>
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