Complex classes like File often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use File, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 9 | class File { | 
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| 10 | |||
| 11 | private $name = null;  | 
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| 12 | private $tempName = null;  | 
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| 13 | private $extension = null;  | 
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| 14 | private $size = 0;  | 
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| 15 | |||
| 16 | /** @var Directory */  | 
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| 17 | private $directory = null;  | 
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| 18 | protected $uploadPrepared = false;  | 
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| 19 | private $oldName = null;  | 
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| 20 | protected static $maxSize = 10;  | 
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| 21 | protected static $validExtensions = ['jpg', 'jpeg', 'png', 'gif', 'svg', 'csv', 'doc', 'docx', 'odt', 'pdf', 'txt', 'md', 'mp3', 'wav', 'mpeg'];  | 
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| 22 | |||
| 23 | /* Construtor */  | 
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| 24 | |||
| 25 | 	public function __construct($name = '') { | 
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| 35 | |||
| 36 | /* Metodos de acesso */  | 
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| 37 | |||
| 38 | 	public function getName() { | 
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| 41 | |||
| 42 | 	public function getTempName() { | 
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| 45 | |||
| 46 | 	public function getExtension() { | 
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| 52 | |||
| 53 | 	public function getSize() { | 
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| 56 | |||
| 57 | 	public function getDirectory() { | 
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| 60 | |||
| 61 | 	public function getOldName() { | 
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| 64 | |||
| 65 | 	public function setName($name) { | 
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| 68 | |||
| 69 | 	public function setTempName($tempName) { | 
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| 72 | |||
| 73 | /** @param string $directory */  | 
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| 74 | 	public function setDirectory($directory) { | 
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| 77 | |||
| 78 | 	public function setOldName($oldName) { | 
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| 81 | |||
| 82 | 	public function getFullName() { | 
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| 85 | |||
| 86 | 	public function __toString() { | 
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| 93 | |||
| 94 | /* Metodos */  | 
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| 95 | |||
| 96 | /**  | 
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| 97 | * Recebe o Arquivo temporário  | 
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| 98 | * @param array $files $_FILES['arquivo']  | 
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| 99 | * @example $obj->receiveFiles($_FILES['arquivo']);  | 
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| 100 | */  | 
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| 101 | 	function receiveFiles($files) { | 
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| 112 | |||
| 113 | /**  | 
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| 114 | * Recebe o Arquivo temporário  | 
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| 115 | * @param string $fileName $_POST['arquivo']  | 
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| 116 | * @example $obj->receivePost($_POST['arquivo']);  | 
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| 117 | */  | 
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| 118 | 	public function receivePost($fileName) { | 
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| 129 | |||
| 130 | /**  | 
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| 131 | * Realiza o envio para a pasta, reduzindo o tamanho e com um nome aleatório  | 
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| 132 | * @param string $newName opcional, escolhe o nome que será salvo  | 
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| 133 | * @return string Retorna algum erro ou NULL  | 
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| 134 | */  | 
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| 135 | 	function upload($newName = '') { | 
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| 169 | |||
| 170 | /** Retorna true se arquivo existe */  | 
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| 171 | 	public function exists() { | 
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| 174 | |||
| 175 | /** Move o arquivo de $temp para $diretorio atual */  | 
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| 176 | 	public function move() { | 
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| 185 | |||
| 186 | /** Exclui o arquivo no diretorio */  | 
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| 187 | 	public function remove() { | 
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| 192 | |||
| 193 | /** Exclui o arquivo que existia antes de enviar */  | 
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| 194 | 	public function removeOld() { | 
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| 200 | |||
| 201 | /**  | 
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| 202 | * Remove diretorio(s) por expressao regular  | 
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| 203 | * @param string $regExp  | 
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| 204 | * @return int quantidade de diretorios removidos  | 
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| 205 | */  | 
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| 206 | 	public static function removeRegExp($regExp) { | 
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| 213 | |||
| 214 | /**  | 
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| 215 | * Retorna a extension pelo nome  | 
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| 216 | * @param string $name  | 
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| 217 | * @return string  | 
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| 218 | */  | 
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| 219 | 	protected static function getExtensionByName($name) { | 
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| 223 | |||
| 224 | /**  | 
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| 225 | * Salva conteudo no arquivo  | 
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| 226 | * @param string $content  | 
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| 227 | * @param string $mode  | 
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| 228 | */  | 
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| 229 | 	public function write($content = '', $mode = 'a') { | 
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| 237 | |||
| 238 | /**  | 
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| 239 | * Retorna o conteudo do arquivo  | 
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| 240 | * @param string $content  | 
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| 241 | */  | 
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| 242 | 	public function read() { | 
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| 245 | |||
| 246 | }  | 
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| 247 | 
Adding explicit visibility (
private,protected, orpublic) is generally recommend to communicate to other developers how, and from where this method is intended to be used.