mirror of
https://github.com/sigmasternchen/php-doc-en
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144 lines
4.1 KiB
XML
144 lines
4.1 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xml:id="function.imagepng" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>imagepng</refname>
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<refpurpose>Output a PNG image to either the browser or a file</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>bool</type><methodname>imagepng</methodname>
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<methodparam><type>GdImage</type><parameter>image</parameter></methodparam>
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<methodparam choice="opt"><type class="union"><type>resource</type><type>string</type><type>null</type></type><parameter>file</parameter><initializer>&null;</initializer></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>quality</parameter><initializer>-1</initializer></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>filters</parameter><initializer>-1</initializer></methodparam>
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</methodsynopsis>
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<para>
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Outputs or saves a <acronym>PNG</acronym> image from the given
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<parameter>image</parameter>.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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&gd.image.description;
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<varlistentry>
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<term><parameter>file</parameter></term>
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<listitem>
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<para>&gd.image.path;</para>
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<note>
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<para>
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&null; is invalid if the <parameter>quality</parameter> and
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<parameter>filters</parameter> arguments are not used.
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</para>
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</note>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>quality</parameter></term>
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<listitem>
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<para>
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Compression level: from 0 (no compression) to 9.
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The default (<literal>-1</literal>) uses the zlib compression default.
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For more information see the <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="&url.zlib.manual;">zlib manual</link>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>filters</parameter></term>
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<listitem>
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<para>
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Allows reducing the PNG file size. It is a bitmask field which may be
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set to any combination of the <literal>PNG_FILTER_XXX</literal>
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constants. <constant>PNG_NO_FILTER</constant> or
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<constant>PNG_ALL_FILTERS</constant> may also be used to respectively
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disable or activate all filters.
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The default value (<literal>-1</literal>) disables filtering.
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</para>
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<caution>
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<simpara>
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The <parameter>filters</parameter> parameter is ignored by system libgd.
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</simpara>
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</caution>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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&return.success;
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</para>
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&gd.return.trueonerror;
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</refsect1>
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<refsect1 role="changelog">
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&reftitle.changelog;
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<informaltable>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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&gd.changelog.image-param;
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</tbody>
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</tgroup>
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</informaltable>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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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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$im = imagecreatefrompng("test.png");
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header('Content-Type: image/png');
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imagepng($im);
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imagedestroy($im);
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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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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<simplelist>
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<member><function>imagegif</function></member>
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<member><function>imagewbmp</function></member>
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<member><function>imagejpeg</function></member>
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<member><function>imagetypes</function></member>
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<member><function>imagesavealpha</function></member>
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</simplelist>
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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:"~/.phpdoc/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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