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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@90156 c90b9560-bf6c-de11-be94-00142212c4b1
68 lines
2.1 KiB
XML
68 lines
2.1 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.17 $ -->
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<chapter id="features.images">
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<title>Creating and manipulating images</title>
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<simpara>
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PHP is not limited to creating just HTML output. It can also be
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used to create and manipulate image files in a variety of different
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image formats, including gif, png, jpg, wbmp, and xpm. Even more
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convenient, PHP can output image streams directly to a browser. You
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will need to compile PHP with the
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<link linkend="ref.image">GD library of image functions</link> for
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this to work. GD and PHP may also require other libraries, depending
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on which image formats you want to work with. GD stopped supporting
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Gif images in version 1.6.
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</simpara>
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<para>
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<example>
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<title>PNG creation with PHP</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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Header("Content-type: image/png");
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$string=implode($argv," ");
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$im = ImageCreateFromPng("images/button1.png");
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$orange = ImageColorAllocate($im, 220, 210, 60);
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$px = (imagesx($im)-7.5*strlen($string))/2;
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ImageString($im,3,$px,9,$string,$orange);
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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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</example>
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This example would be called from a page with a tag like: <img
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src="button.php?text">. The above button.php script
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then takes this "text" string an overlays it on top of a
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base image which in this case is "images/button1.png"
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and outputs the resulting image. This is a very convenient way to
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avoid having to draw new button images every time you want to
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change the text of a button. With this method they are
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dynamically generated.
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</para>
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</chapter>
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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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