Generate a Bitcoin icon in SVG and PNG

bitcoin-icon.php

<?php

ob_start();

$text = '&#x20bf;';

?><?xml version="1.0"?>
<svg
	xmlns="http://www.w3.org/2000/svg"
	xmlns:xlink="http://www.w3.org/1999/xlink"
	viewBox="0 0 128 128">

	<defs>
		<filter id="shadow" x="0" y="0" width="200%" height="200%">
			<feGaussianBlur in="SourceAlpha" stdDeviation="8"/>
			<feOffset dx="8" dy="8" result="offsetblur"/>
			<feFlood flood-color="#000000" flood-opacity="1"/>
			<feComposite in2="offsetblur" operator="in"/>
			<feMerge>
				<feMergeNode/>
				<feMergeNode in="SourceGraphic"/>
			</feMerge>
		</filter>
	</defs>

	<g filter="url(#shadow)">

		<circle
			fill="orange"
			stroke="transparent"
			cx="32"
			cy="32"
			r="31"
			stroke-width="0">
		</circle>


		<text
			transform="rotate(10 32 32)"
			x="32"
			y="32"
			text-anchor="middle"
			fill="white"
			font-size="36pt"
			stroke="0"
			dy=".3em">
			
			<?php echo $text; ?>
		</text>
	</g>
</svg>
<?php

$svg = ob_get_clean();

// write out the SVG to file
file_put_contents( 'bitcoin-icon.svg', $svg );

// now use Imagick to render the icon to raster
$im = new Imagick();
$im->setBackgroundColor( new ImagickPixel( 'transparent' ) );
$im->readImageBlob( $svg );
$im->setImageFormat( "png24" );
$im->writeImage( 'bitcoin-icon.png' );
$im->clear();
$im->destroy();