FileSystem::apend fix #3

Author: Pechynho

src/FileSystem.php

@@ -122,6 +122,7 @@ public static function write($filename, $content, $overwrite = false)
 		$file = fopen($filename, "w");
 		fwrite($file, $content);
 		fclose($file);
+		clearstatcache();
 	}
 
 	/**
@@ -143,9 +144,8 @@ public static function append($filename, $content, $newLine = true)
 		{
 			throw new InvalidArgumentException("Given value '$filename' is not valid filename.");
 		}
-		$isEmpty = !(FileSystem::isFile($filename) && FileSystem::size($filename) > 0);
 		$file = fopen($filename, "a");
-		if ($isEmpty)
+		if (FileSystem::isEmpty($filename))
 		{
 			fwrite($file, $content);
 		}
@@ -158,6 +158,7 @@ public static function append($filename, $content, $newLine = true)
 			fwrite($file, PHP_EOL . $content);
 		}
 		fclose($file);
+		clearstatcache();
 	}
 
 	/**
@@ -186,6 +187,7 @@ public static function readAllLines($filename, $trimEndOfLine = true)
 			$lines[] = $trimEndOfLine ? Strings::trimEnd(fgets($file), [PHP_EOL]) : fgets($file);
 		}
 		fclose($file);
+		clearstatcache();
 		return $lines;
 	}
 
@@ -214,6 +216,7 @@ public static function readLineByLine($filename, $trimEndOfLine = true)
 			yield $trimEndOfLine ? Strings::trimEnd(fgets($file), [PHP_EOL]) : fgets($file);
 		}
 		fclose($file);
+		clearstatcache();
 	}
 
 	/**