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

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<refentry xml:id="function.imagegif" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>imagegif</refname>
  <refpurpose>Output image to browser or file</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>imagegif</methodname>
   <methodparam><type>resource</type><parameter>image</parameter></methodparam>
   <methodparam choice="opt"><type>string</type><parameter>filename</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>imagegif</function> creates the <acronym>GIF</acronym>
   file in filename from the image <parameter>image</parameter>. The
   <parameter>image</parameter> argument is the return from the
   <function>imagecreate</function> or <literal>imagecreatefrom*</literal>
   function.
  </para>
  <para>
   The image format will be <acronym>GIF87a</acronym> unless the
   image has been made transparent with
   <function>imagecolortransparent</function>, in which case the
   image format will be <acronym>GIF89a</acronym>.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    &gd.image.description;
    <varlistentry>
     <term><parameter>filename</parameter></term>
     <listitem>
      <para>
       The path to save the file to. If not set or &null;, the raw image stream
       will be outputted directly.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>
 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    Since all <acronym>GIF</acronym> support was removed from the
    <acronym>GD</acronym> library in version 1.6, this function is
    not available if you are using that version of the GD library.
    Support is expected to return in a version subsequent to the
    rerelease of <acronym>GIF</acronym> support in the GD library in
    mid 2004.  For more information, see the
    <link xlink:href="&url.gd;">GD Project</link> site.
   </para>
   <para>
    The following code snippet allows you to write more
    portable PHP applications by auto-detecting the
    type of GD support which is available. Replace
    the sequence <literal>header ("Content-type: image/gif");
    imagegif ($im);</literal> by the more flexible sequence:
    <informalexample>
     <programlisting role="php">
<![CDATA[
<?php
if (function_exists("imagegif")) {
    header("Content-type: image/gif");
    imagegif($im);
} elseif (function_exists("imagejpeg")) {
    header("Content-type: image/jpeg");
    imagejpeg($im, "", 0.5);
} elseif (function_exists("imagepng")) {
    header("Content-type: image/png");
    imagepng($im);
} elseif (function_exists("imagewbmp")) {
    header("Content-type: image/vnd.wap.wbmp");
    imagewbmp($im);
} else {
    die("No image support in this PHP server");
}
?>
]]>
     </programlisting>
    </informalexample>
   </para>
  </note>
  <note>
   <para>
    As of version 3.0.18 and 4.0.2 you can use the function
    <function>imagetypes</function> in place of
    <function>function_exists</function> for checking
    the presence of the various supported image formats:
    <informalexample>
     <programlisting role="php">
<![CDATA[
<?php
if (imagetypes() & IMG_GIF) {
    header ("Content-type: image/gif");
    imagegif ($im);
} elseif (imagetypes() & IMG_JPG) {
    /* ... etc. */
}
?>
]]>
     </programlisting>
    </informalexample>
   </para>
  </note>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>imagepng</function></member>
    <member><function>imagewbmp</function></member>
    <member><function>imagejpeg</function></member>
    <member><function>imagetypes</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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