php-doc-en/reference/image/functions/imagegd2.xml

<?xml version="1.0" encoding="iso-8859-1"?>
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  <refentry id='function.imagegd2'>
   <refnamediv>
    <refname>imagegd2</refname>
    <refpurpose>Output GD2 image to browser or file</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>imagegd2</methodname>
      <methodparam><type>resource</type><parameter>image</parameter></methodparam>
      <methodparam choice="opt"><type>string</type><parameter>filename</parameter></methodparam>
      <methodparam choice="opt"><type>int</type><parameter>chunk_size</parameter></methodparam>
      <methodparam choice="opt"><type>int</type><parameter>type</parameter></methodparam>
     </methodsynopsis>
    <para>
     <function>imagegd2</function> outputs a GD2 image to
     <parameter>filename</parameter>.
     The <parameter>image</parameter> parameter is the return from the
     <function>imagecreatetruecolor</function> function.
    </para>
    <para>
     The <parameter>filename</parameter> parameter is optional, and if left
     off, the raw image stream will be output directly.
    </para>
    <para>
     The optional <parameter>type</parameter> parameter is either 
     <constant>IMG_GD2_RAW</constant> or <constant>IMG_GD2_COMPRESSED</constant>.
     Default is <constant>IMG_GD2_RAW</constant>.
    </para>
    <note>
     <para>
      The optional <parameter>chunk_size</parameter> and
      <parameter>type</parameter> parameters became available
      in PHP 4.3.2.
     </para>
    </note>
    <note>
     <para>
      The GD2 format is commonly used to allow fast loading of parts of images.
      Note that the GD2 format is only usable in GD2-compatible applications.
     </para>
    </note>
    &note.gd.2;
    <para>
     See also <function>imagegd</function>
    </para>
   </refsect1>
  </refentry>

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