example.php

require_once __DIR__ . '/geocaching.php';

var_dump( getFoundCacheCount( '3f4da330-f5d0-411d-bcee-74672b284351' ) );

geocaching.php

/**
 * Simple OCR for getting the found cache count from the statusbar image.
 *
 * Requires `allow_url_fopen` to be set to TRUE
 *
 * @param  string your geocaching UID
 * @return int amount of caches you've found
 *
 * @see http://img.geocaching.com/stats/img.aspx?uid=3f4da330-f5d0-411d-bcee-74672b284351 - status bar example
 * @see http://diskuse.jakpsatweb.cz/?action=vthread&forum=17&topic=141026 (cze) - thanks to Cho
 */
function getFoundCacheCount( $uID )
{
	$masks = array(
		'01410242034304440545',
		'1020',
		'00404142332415',
		'0041233344450646',
		'20112102122223240515253526',
		'1222324344450646',
		'10400102031323330444054546',
		'403225',
		'4041234405450646',
		'000141024213233343444506',
		'2115',
	);

	$starts = array(93, 23);
	$charRes = array(5, 7);
	$colourLimit = 50;
	$result = '';

	$image = imageCreateFromString( file_get_contents( 'http://img.geocaching.com/stats/img.aspx?uid=' . $uID ) );

	for ($i = 0; $i < 100; $i++) {
		$crop = imageCreateTrueColor( $charRes[0], $charRes[1] );
		imageCopy( $crop, $image, 0, 0, $starts[0] + $i, $starts[1], $charRes[0], $charRes[1] );

		$mask = '';
		for ($j = 0; $j < $charRes[1]; $j++) {
			for ($k = 0; $k < $charRes[0]; $k++) {
				$rgb = imageColorsForIndex( $crop, imageColorAt($crop, $k, $j) );
				if ($rgb['red'] < $colourLimit && $rgb['green'] < $colourLimit && $rgb['blue'] < $colourLimit) {
					$mask .= $k . $j;
				}
			}
		}

		imageDestroy($crop);

		foreach ($masks as $key => $val) {
			if ($val === $mask) {
				if ($key === 10) { // slash char
					break 2;

				} else {
					$result .= $key;
				}
			}
		}
	}

	imageDestroy($image);
	return (int) $result;
}