phpthumb.functions.php

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				$OverlayPixel = phpthumb_functions::GetPixelColor($src_im, $x, $y);
				$alphapct = $OverlayPixel['alpha'] / 127;
				$opacipct = $pct / 100;
				$overlaypct = (1 - $alphapct) * $opacipct;

				$newcolor = phpthumb_functions::ImageColorAllocateAlphaSafe(
					$dst_im,
					round($RealPixel['red']   * (1 - $overlaypct)) + ($OverlayPixel['red']   * $overlaypct),
					round($RealPixel['green'] * (1 - $overlaypct)) + ($OverlayPixel['green'] * $overlaypct),
					round($RealPixel['blue']  * (1 - $overlaypct)) + ($OverlayPixel['blue']  * $overlaypct),
					//$RealPixel['alpha']);
					0);

				ImageSetPixel($dst_im, $dst_x + $x, $dst_y + $y, $newcolor);
			}
		}
		return true;
	}

	function ProportionalResize($old_width, $old_height, $new_width=false, $new_height=false) {
		$old_aspect_ratio = $old_width / $old_height;
		if (($new_width === false) && ($new_height === false)) {
			return false;
		} elseif ($new_width === false) {
			$new_width = $new_height * $old_aspect_ratio;
		} elseif ($new_height === false) {
			$new_height = $new_width / $old_aspect_ratio;
		}
		$new_aspect_ratio = $new_width / $new_height;
		if ($new_aspect_ratio == $old_aspect_ratio) {
			// great, done
		} elseif ($new_aspect_ratio < $old_aspect_ratio) {
			// limited by width
			$new_height = $new_width / $old_aspect_ratio;
		} elseif ($new_aspect_ratio > $old_aspect_ratio) {
			// limited by height
			$new_width = $new_height * $old_aspect_ratio;
		}
		return array(round($new_width), round($new_height));
	}

	function SafeExec($command) {
		static $AllowedExecFunctions = array();
		if (empty($AllowedExecFunctions)) {
			$AllowedExecFunctions = array('shell_exec'=>true, 'passthru'=>true, 'system'=>true, 'exec'=>true);
			if (@ini_get('safe_mode')) {
				$AllowedExecFunctions['shell_exec'] = false;
			}
			$disable_functions = explode(',', @ini_get('disable_functions'));
			foreach ($AllowedExecFunctions as $key => $value) {
				if (in_array($key, $disable_functions)) {
					$AllowedExecFunctions[$key] = false;
				}
			}
		}
		foreach ($AllowedExecFunctions as $execfunction => $is_allowed) {
			if (!$is_allowed) {
				continue;
			}
			if ($execfunction == 'passthru') {
				ob_start();
				$execfunction($command);
				$returnvalue = ob_get_contents();
				ob_end_clean();
			} else {
				$returnvalue = @$execfunction($command);
			}
			return $returnvalue;
		}
		return false;
	}

	function ApacheLookupURIarray($filename) {
		// apache_lookup_uri() only works when PHP is installed as an Apache module.
		if (php_sapi_name() == 'apache') {
			$keys = array('status', 'the_request', 'status_line', 'method', 'content_type', 'handler', 'uri', 'filename', 'path_info', 'args', 'boundary', 'no_cache', 'no_local_copy', 'allowed', 'send_bodyct', 'bytes_sent', 'byterange', 'clength', 'unparsed_uri', 'mtime', 'request_time');
			if ($apacheLookupURIobject = @apache_lookup_uri($filename)) {
				$apacheLookupURIarray = array();
				foreach ($keys as $key) {
					$apacheLookupURIarray[$key] = @$apacheLookupURIobject->$key;
				}
				return $apacheLookupURIarray;
			}
		}
		return false;
	}

	function gd_is_bundled() {
		static $isbundled = null;
		if (is_null($isbundled)) {
			$gd_info = phpthumb_functions::gd_info();
			$isbundled = (strpos($gd_info['GD Version'], 'bundled') !== false);
		}
		return $isbundled;
	}

	function gd_version($fullstring=false) {
		static $cache_gd_version = array();
		if (empty($cache_gd_version)) {
			$gd_info = phpthumb_functions::gd_info();
			if (eregi('bundled \((.+)\)$', $gd_info['GD Version'], $matches)) {
				$cache_gd_version[1] = $gd_info['GD Version'];  // e.g. "bundled (2.0.15 compatible)"
				$cache_gd_version[0] = (float) $matches[1];     // e.g. "2.0" (not "bundled (2.0.15 compatible)")
			} else {
				$cache_gd_version[1] = $gd_info['GD Version'];                       // e.g. "1.6.2 or higher"
				$cache_gd_version[0] = (float) substr($gd_info['GD Version'], 0, 3); // e.g. "1.6" (not "1.6.2 or higher")
			}
		}
		return $cache_gd_version[intval($fullstring)];
	}

	function gd_info() {
		if (function_exists('gd_info')) {
			// built into PHP v4.3.0+ (with bundled GD2 library)
			return gd_info();
		}

		static $gd_info = array();
		if (empty($gd_info)) {
			// based on code by johnschaefer at gmx dot de
			// from PHP help on gd_info()
			$gd_info = array(
				'GD Version'         => '',
				'FreeType Support'   => false,
				'FreeType Linkage'   => '',
				'T1Lib Support'      => false,
				'GIF Read Support'   => false,
				'GIF Create Support' => false,
				'JPG Support'        => false,
				'PNG Support'        => false,
				'WBMP Support'       => false,
				'XBM Support'        => false
			);
			$phpinfo_array = phpthumb_functions::phpinfo_array();
			foreach ($phpinfo_array as $line) {
				$line = trim(strip_tags($line));
				foreach ($gd_info as $key => $value) {
					//if (strpos($line, $key) !== false) {
					if (strpos($line, $key) === 0) {
						$newvalue = trim(str_replace($key, '', $line));
						$gd_info[$key] = $newvalue;
					}
				}
			}
			if (empty($gd_info['GD Version'])) {
				// probable cause: "phpinfo() disabled for security reasons"
				if (function_exists('ImageTypes')) {
					$imagetypes = ImageTypes();
					if ($imagetypes & IMG_PNG) {
						$gd_info['PNG Support'] = true;
					}
					if ($imagetypes & IMG_GIF) {
						$gd_info['GIF Create Support'] = true;
					}
					if ($imagetypes & IMG_JPG) {
						$gd_info['JPG Support'] = true;
					}
					if ($imagetypes & IMG_WBMP) {
						$gd_info['WBMP Support'] = true;
					}
				}
				// to determine capability of GIF creation, try to use ImageCreateFromGIF on a 1px GIF
				if (function_exists('ImageCreateFromGIF')) {
					if ($tempfilename = phpthumb::phpThumb_tempnam()) {
						if ($fp_tempfile = @fopen($tempfilename, 'wb')) {
							fwrite($fp_tempfile, base64_decode('R0lGODlhAQABAIAAAH//AP///ywAAAAAAQABAAACAUQAOw==')); // very simple 1px GIF file base64-encoded as string
							fclose($fp_tempfile);

							// if we can convert the GIF file to a GD image then GIF create support must be enabled, otherwise it's not
							$gd_info['GIF Read Support'] = (bool) @ImageCreateFromGIF($tempfilename);
						}
						unlink($tempfilename);
					}
				}
				if (function_exists('ImageCreateTrueColor') && @ImageCreateTrueColor(1, 1)) {
					$gd_info['GD Version'] = '2.0.1 or higher (assumed)';
				} elseif (function_exists('ImageCreate') && @ImageCreate(1, 1)) {
					$gd_info['GD Version'] = '1.6.0 or higher (assumed)';
				}
			}
		}
		return $gd_info;
	}

	function filesize_remote($remotefile, $timeout=10) {
		$size = false;
		$url = parse_url($remotefile);
		if ($fp = @fsockopen($url['host'], ($url['port'] ? $url['port'] : 80), $errno, $errstr, $timeout)) {
			fwrite($fp, 'HEAD '.@$url['path'].@$url['query'].' HTTP/1.0'."\r\n".'Host: '.@$url['host']."\r\n\r\n");
			if (phpthumb_functions::version_compare_replacement(phpversion(), '4.3.0', '>=')) {
				stream_set_timeout($fp, $timeout);
			}
			while (!feof($fp)) {
				$headerline = fgets($fp, 4096);
				if (eregi('^Content-Length: (.*)', $headerline, $matches)) {
					$size = intval($matches[1]);
					break;
				}
			}
			fclose ($fp);
		}
		return $size;
	}

	function filedate_remote($remotefile, $timeout=10) {
		$date = false;
		$url = parse_url($remotefile);
		if ($fp = @fsockopen($url['host'], ($url['port'] ? $url['port'] : 80), $errno, $errstr, $timeout)) {
			fwrite($fp, 'HEAD '.@$url['path'].@$url['query'].' HTTP/1.0'."\r\n".'Host: '.@$url['host']."\r\n\r\n");
			if (phpthumb_functions::version_compare_replacement(phpversion(), '4.3.0', '>=')) {
				stream_set_timeout($fp, $timeout);
			}
			while (!feof($fp)) {
				$headerline = fgets($fp, 4096);
				if (eregi('^Last-Modified: (.*)', $headerline, $matches)) {
					$date = strtotime($matches[1]) - date('Z');
					break;
				}
			}
			fclose ($fp);
		}
		return $date;
	}

	function md5_file_safe($filename) {
		// md5_file() doesn't exist in PHP < 4.2.0
		if (function_exists('md5_file')) {
			return md5_file($filename);
		}
		if ($fp = @fopen($filename, 'rb')) {
			$filedata = fread($fp, filesize($filename));
			fclose($fp);
			return md5($filedata);
		}
		return false;
	}

	function nonempty_min() {
		$arg_list = func_get_args();
		$acceptable = array();
		foreach ($arg_list as $arg) {
			if ($arg) {
				$acceptable[] = $arg;
			}
		}
		return min($acceptable);
	}

}

?>