Source of: /manual/en/image.examples-png.php
<?php
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?>
<div id="image.examples-png" class="section">
<p class="para">
</p><div class="example">
<p><b>Example #1 PNG creation with PHP</b></p>
<div class="example-contents programlisting">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /><br />header</span><span style="color: #007700">(</span><span style="color: #DD0000">"Content-type: image/png"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$string </span><span style="color: #007700">= </span><span style="color: #0000BB">$_GET</span><span style="color: #007700">[</span><span style="color: #DD0000">'text'</span><span style="color: #007700">];<br /></span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatefrompng</span><span style="color: #007700">(</span><span style="color: #DD0000">"images/button1.png"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$orange </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">220</span><span style="color: #007700">, </span><span style="color: #0000BB">210</span><span style="color: #007700">, </span><span style="color: #0000BB">60</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$px </span><span style="color: #007700">= (</span><span style="color: #0000BB">imagesx</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">) - </span><span style="color: #0000BB">7.5 </span><span style="color: #007700">* </span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$string</span><span style="color: #007700">)) / </span><span style="color: #0000BB">2</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">imagestring</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #0000BB">$px</span><span style="color: #007700">, </span><span style="color: #0000BB">9</span><span style="color: #007700">, </span><span style="color: #0000BB">$string</span><span style="color: #007700">, </span><span style="color: #0000BB">$orange</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagepng</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div><p>
This example would be called from a page with a tag like: <i><img
src="button.php?text=text"></i>. The above <var class="filename">button.php</var> script
then takes this <i>"text"</i> string and overlays it on top of a
base image which in this case is <i>"images/button1.png"</i>
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.
</p>
</div><?php manual_footer(); ?>
