php path

class Path{
	private static function encode_special_text($path){
		$path = str_replace(':/','{{ptcl_sep}}',$path);
		return $path;
	}
	private static function decode_special_text($path){
		$path = str_replace('{{ptcl_sep}}',':/',$path);
		return $path;
	}
	// =========================================================================
	// 結合
	// =========================================================================
	public static function join(){
		$opt  = [
			'last_slash' => 'true'
		];
		$args = func_get_args();
		// オプション変更
		if(is_array(end($args))) $opt = array_merge($opt,array_pop($args));
		// ---------------------------------------------------------------------
		$path = trim($args[0]);
		// 先頭
		if(preg_match('/^\/{2}/',$path)) $path = preg_replace('/^\/{2}/','//',$path);
		else $path = preg_replace('/^\/+/','/',$path);
		// 末尾
		if(preg_match('/[a-zA-Z]:\/{2}$/',$path)) $path = preg_replace('/\/+$/','/',$path);
		else $path = preg_replace('/\/+$/','',$path);

		$path = Path::encode_special_text($path);
		$i = 1;
		$l = count($args);
		for(; $i<$l; $i++){
			$base_arr = explode( '/', $path );
			$path_arr = explode( '/', preg_replace( '/^\/+|\/+$/', '', trim($args[$i]) ) );
			$ii = 0;
			$ll = count($path_arr);
			for(; $ii<$ll; $ii++){
				if(preg_match('/^\.{2}$/',$path_arr[$ii])) array_pop($base_arr);
				else if(preg_match('/^\.$/',$path_arr[$ii])) continue;
				else $base_arr[] = $path_arr[$ii];
			}
			$path = implode('/',$base_arr);
		}
		$path = Path::decode_special_text($path);
		if($opt['last_slash'] && !preg_match('/\.[a-zA-Z]{2,4}\??[a-zA-Z0-9\-=_\.\[\]\~\+\-\\|\¥\)\(\#\!\'\"\}\{\@\$%&\^`\*\;\:]*$/',$path)){
			$path .= '/';
		}
		return $path;
	}
	// =========================================================================
	// パスの最後の要素を返す
	// =========================================================================
	public static function basename($p='',$ext=''){
		$p = explode('/',$p);
		$p = end($p);
		if(!empty($ext)){
			$ext = '.'.$ext;
			$p   = substr($p,0,strpos($p,$ext));
			return $p;
		}else return $p;
	}
}