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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@218859 c90b9560-bf6c-de11-be94-00142212c4b1
125 lines
4.1 KiB
XML
125 lines
4.1 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.12 $ -->
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<!-- splitted from ./en/functions/image.xml, last change in rev 1.3 -->
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<refentry id="function.imagegif">
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<refnamediv>
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<refname>imagegif</refname>
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<refpurpose>Output image to browser or file</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>bool</type><methodname>imagegif</methodname>
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<methodparam><type>resource</type><parameter>image</parameter></methodparam>
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<methodparam choice="opt"><type>string</type><parameter>filename</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>imagegif</function> creates the <acronym>GIF</acronym>
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file in filename from the image <parameter>image</parameter>. The
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<parameter>image</parameter> argument is the return from the
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<function>imagecreate</function> or <literal>imagecreatefrom*</literal>
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function.
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</para>
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<para>
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The image format will be <acronym>GIF87a</acronym> unless the
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image has been made transparent with
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<function>imagecolortransparent</function>, in which case the
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image format will be <acronym>GIF89a</acronym>.
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</para>
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<para>
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The filename argument is optional, and if left off or filled
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with a &null; value, the raw image stream will be output directly.
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By sending an image/gif content-type using <function>header</function>,
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you can create a PHP script that outputs <acronym>GIF</acronym>
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images directly.
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<note>
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<para>
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Since all <acronym>GIF</acronym> support was removed from the
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<acronym>GD</acronym> library in version 1.6, this function is
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not available if you are using that version of the GD library.
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Support is expected to return in a version subsequent to the
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rerelease of <acronym>GIF</acronym> support in the GD library in
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mid 2004. For more information, see the
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<ulink url="&url.gd;">GD Project</ulink> site.
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</para>
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<para>
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The following code snippet allows you to write more
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portable PHP applications by auto-detecting the
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type of GD support which is available. Replace
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the sequence <literal>header ("Content-type: image/gif");
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imagegif ($im);</literal> by the more flexible sequence:
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<informalexample>
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<programlisting role="php">
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<![CDATA[
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<?php
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if (function_exists("imagegif")) {
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header("Content-type: image/gif");
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imagegif($im);
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} elseif (function_exists("imagejpeg")) {
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header("Content-type: image/jpeg");
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imagejpeg($im, "", 0.5);
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} elseif (function_exists("imagepng")) {
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header("Content-type: image/png");
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imagepng($im);
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} elseif (function_exists("imagewbmp")) {
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header("Content-type: image/vnd.wap.wbmp");
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imagewbmp($im);
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} else {
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die("No image support in this PHP server");
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}
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?>
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]]>
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</programlisting>
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</informalexample>
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</para>
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</note>
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<note>
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<para>
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As of version 3.0.18 and 4.0.2 you can use the function
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<function>imagetypes</function> in place of
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<function>function_exists</function> for checking
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the presence of the various supported image formats:
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<informalexample>
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<programlisting role="php">
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<![CDATA[
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<?php
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if (imagetypes() & IMG_GIF) {
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header ("Content-type: image/gif");
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imagegif ($im);
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} elseif (imagetypes() & IMG_JPG) {
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/* ... etc. */
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}
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?>
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]]>
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</programlisting>
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</informalexample>
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</para>
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</note>
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</para>
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<para>
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See also <function>imagepng</function>, <function>imagewbmp</function>,
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<function>imagejpeg</function> and <function>imagetypes</function>.
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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