getID3::__construct

	const VERSION           = '1.9.20-202006061653';
	const FREAD_BUFFER_SIZE = 32768;

	const ATTACHMENTS_NONE   = false;
	const ATTACHMENTS_INLINE = true;

	public function __construct() {

		// Check for PHP version
		$required_php_version = '5.3.0';
		if (version_compare(PHP_VERSION, $required_php_version, '<')) {
			$this->startup_error .= 'getID3() requires PHP v'.$required_php_version.' or higher - you are running v'.PHP_VERSION."\n";
			return;
		}

		// Check memory
		$memoryLimit = ini_get('memory_limit');
		if (preg_match('#([0-9]+) ?M#i', $memoryLimit, $matches)) {
			// could be stored as "16M" rather than 16777216 for example
			$memoryLimit = $matches[1] * 1048576;
		} elseif (preg_match('#([0-9]+) ?G#i', $memoryLimit, $matches)) { // The 'G' modifier is available since PHP 5.1.0
			// could be stored as "2G" rather than 2147483648 for example
			$memoryLimit = $matches[1] * 1073741824;
		}
		$this->memory_limit = $memoryLimit;

		if ($this->memory_limit <= 0) {
			// memory limits probably disabled
		} elseif ($this->memory_limit <= 4194304) {
			$this->startup_error .= 'PHP has less than 4MB available memory and will very likely run out. Increase memory_limit in php.ini'."\n";
		} elseif ($this->memory_limit <= 12582912) {
			$this->startup_warning .= 'PHP has less than 12MB available memory and might run out if all modules are loaded. Increase memory_limit in php.ini'."\n";
		}

		// Check safe_mode off
		if (preg_match('#(1|ON)#i', ini_get('safe_mode'))) { // phpcs:ignore PHPCompatibility.IniDirectives.RemovedIniDirectives.safe_modeDeprecatedRemoved
			$this->warning('WARNING: Safe mode is on, shorten support disabled, md5data/sha1data for ogg vorbis disabled, ogg vorbos/flac tag writing disabled.');
		}

		// phpcs:ignore PHPCompatibility.IniDirectives.RemovedIniDirectives.mbstring_func_overloadDeprecated
		if (($mbstring_func_overload = (int) ini_get('mbstring.func_overload')) && ($mbstring_func_overload & 0x02)) {
			// http://php.net/manual/en/mbstring.overload.php
			// "mbstring.func_overload in php.ini is a positive value that represents a combination of bitmasks specifying the categories of functions to be overloaded. It should be set to 1 to overload the mail() function. 2 for string functions, 4 for regular expression functions"
			// getID3 cannot run when string functions are overloaded. It doesn't matter if mail() or ereg* functions are overloaded since getID3 does not use those.
			// phpcs:ignore PHPCompatibility.IniDirectives.RemovedIniDirectives.mbstring_func_overloadDeprecated
			$this->startup_error .= 'WARNING: php.ini contains "mbstring.func_overload = '.ini_get('mbstring.func_overload').'", getID3 cannot run with this setting (bitmask 2 (string functions) cannot be set). Recommended to disable entirely.'."\n";
		}

		// check for magic quotes in PHP < 7.4.0 (when these functions became deprecated)
		if (version_compare(PHP_VERSION, '7.4.0', '<')) {
			// Check for magic_quotes_runtime
			if (function_exists('get_magic_quotes_runtime')) {
				// phpcs:ignore PHPCompatibility.FunctionUse.RemovedFunctions.get_magic_quotes_runtimeDeprecated
				if (get_magic_quotes_runtime()) {
					$this->startup_error .= 'magic_quotes_runtime must be disabled before running getID3(). Surround getid3 block by set_magic_quotes_runtime(0) and set_magic_quotes_runtime(1).'."\n";
				}
			}
			// Check for magic_quotes_gpc
			if (function_exists('get_magic_quotes_gpc')) {
				// phpcs:ignore PHPCompatibility.FunctionUse.RemovedFunctions.get_magic_quotes_gpcDeprecated
				if (get_magic_quotes_gpc()) {
					$this->startup_error .= 'magic_quotes_gpc must be disabled before running getID3(). Surround getid3 block by set_magic_quotes_gpc(0) and set_magic_quotes_gpc(1).'."\n";
				}
			}
		}

		// Load support library
		if (!include_once(GETID3_INCLUDEPATH.'getid3.lib.php')) {
			$this->startup_error .= 'getid3.lib.php is missing or corrupt'."\n";
		}

		if ($this->option_max_2gb_check === null) {
			$this->option_max_2gb_check = (PHP_INT_MAX <= 2147483647);
		}


		// Needed for Windows only:
		// Define locations of helper applications for Shorten, VorbisComment, MetaFLAC
		//   as well as other helper functions such as head, etc
		// This path cannot contain spaces, but the below code will attempt to get the
		//   8.3-equivalent path automatically
		// IMPORTANT: This path must include the trailing slash
		if (GETID3_OS_ISWINDOWS && !defined('GETID3_HELPERAPPSDIR')) {

			$helperappsdir = GETID3_INCLUDEPATH.'..'.DIRECTORY_SEPARATOR.'helperapps'; // must not have any space in this path

			if (!is_dir($helperappsdir)) {
				$this->startup_warning .= '"'.$helperappsdir.'" cannot be defined as GETID3_HELPERAPPSDIR because it does not exist'."\n";
			} elseif (strpos(realpath($helperappsdir), ' ') !== false) {
				$DirPieces = explode(DIRECTORY_SEPARATOR, realpath($helperappsdir));
				$path_so_far = array();
				foreach ($DirPieces as $key => $value) {
					if (strpos($value, ' ') !== false) {
						if (!empty($path_so_far)) {
							$commandline = 'dir /x '.escapeshellarg(implode(DIRECTORY_SEPARATOR, $path_so_far));
							$dir_listing = `$commandline`;
							$lines = explode("\n", $dir_listing);
							foreach ($lines as $line) {
								$line = trim($line);
								if (preg_match('#^([0-9/]{10}) +([0-9:]{4,5}( [AP]M)?) +(<DIR>|[0-9,]+) +([^ ]{0,11}) +(.+)$#', $line, $matches)) {
									list($dummy, $date, $time, $ampm, $filesize, $shortname, $filename) = $matches;
									if ((strtoupper($filesize) == '<DIR>') && (strtolower($filename) == strtolower($value))) {
										$value = $shortname;
									}
								}
							}
						} else {
							$this->startup_warning .= 'GETID3_HELPERAPPSDIR must not have any spaces in it - use 8dot3 naming convention if neccesary. You can run "dir /x" from the commandline to see the correct 8.3-style names.'."\n";
						}
					}
					$path_so_far[] = $value;