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integration from features/images.xml

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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@98882 c90b9560-bf6c-de11-be94-00142212c4b1
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Friedhelm Betz 2002-10-08 17:53:21 +00:00
parent 762a9325ce
commit 2b0530daba
1 changed files with 41 additions and 2 deletions
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43
reference/image/reference.xml
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@ -1,12 +1,21 @@
<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.9 $ -->
<!-- $Revision: 1.10 $ -->
<reference id="ref.image">
<title>Image functions</title>
<titleabbrev>Image</titleabbrev>
<partintro>
<section id="image.intro">
&reftitle.intro;
&reftitle.intro;
<para>
PHP is not limited to creating just HTML output. It can also be
used to create and manipulate image files in a variety of different
image formats, including gif, png, jpg, wbmp, and xpm. Even more
convenient, PHP can output image streams directly to a browser. You
will need to compile PHP with the GD library of image functions for
this to work. GD and PHP may also require other libraries, depending
on which image formats you want to work with.
</para>
<para>
You can use the image functions in PHP to get the size of
<acronym>JPEG</acronym>, <acronym>GIF</acronym>,
@ -87,6 +96,36 @@
&reference.image.constants;
<section id="image.examples">
&reftitle.examples;
<para>
<example>
<title>PNG creation with PHP</title>
<programlisting role="php">
<![CDATA[
<?php
header("Content-type: image/png");
$string = implode($argv, " ");
$im = imagecreatefrompng("images/button1.png");
$orange = imagecolorallocate($im, 220, 210, 60);
$px = (imagesx($im) - 7.5 * strlen($string)) / 2;
imagestring($im, 3, $px, 9, $string, $orange);
imagepng($im);
imagedestroy($im);
?>
]]>
</programlisting>
</example>
This example would be called from a page with a tag like: &lt;img
src=&quot;button.php?text&quot;&gt;. The above button.php script
then takes this &quot;text&quot; string and overlays it on top of a
base image which in this case is &quot;images/button1.png&quot;
and outputs the resulting image. This is a very convenient way to
avoid having to draw new button images every time you want to
change the text of a button. With this method they are
dynamically generated.
</para>
</section>
</partintro>
&reference.image.functions;