{"id":474,"date":"2009-10-25T18:07:17","date_gmt":"2009-10-25T20:07:17","guid":{"rendered":"https:\/\/www.kadunew.com\/blog\/?p=474"},"modified":"2009-12-24T09:58:56","modified_gmt":"2009-12-24T11:58:56","slug":"funcao-autoload-no-php","status":"publish","type":"post","link":"https:\/\/www.kadunew.com\/blog\/php\/funcao-autoload-no-php","title":{"rendered":"Fun\u00e7\u00e3o autoload no PHP"},"content":{"rendered":"<p>A fun\u00e7\u00e3o <em>autoload <\/em>\u00e9 utilizada no PHP para fazer o carregamento autom\u00e1tico das classes.<\/p>\n<p>Sempre que desejarmos criar um objeto, temos que ter obrigatoriamente a classe respons\u00e1vel pela cria\u00e7\u00e3o do objeto carregada na mem\u00f3ria, caso contr\u00e1rio o PHP retornar\u00e1 um erro. Para carregar classes na mem\u00f3ria podemos carregar todas as classes no inicio do documento utilizando o comando <em>include_once<\/em> ou com o mesmo comando imediatamente antes de instanciar um objeto.<\/p>\n<p><!--more Continuar lendo...--><\/p>\n<div class=\"pullquote\">A fun\u00e7\u00e3o autoload \u00e9 utilizada no PHP para fazer o carregamento autom\u00e1tico das classes<\/div>\n<p>O grande problema \u00e9 que o <em>include_once<\/em> carrega na mem\u00f3ria as classes mesmo que voc\u00ea n\u00e3o use. Muitas vezes uma classe s\u00f3 \u00e9 utilizada se o usu\u00e1rio fizer alguma requisi\u00e7\u00e3o no sistema, um determinado passo, ou se o usu\u00e1rio der um clique em um bot\u00e3o, etc. Para resolver e simplificar tal procedimento o PHP disponibiliza a fun\u00e7\u00e3o de &#8220;carregamento autom\u00e1tico&#8221;, que \u00e9 a fun\u00e7\u00e3o <em>autoload<\/em>, que carrega a classe apenas quando um objeto dessa classe for criada, tornando o processo de carregamento das classes para a mem\u00f3ria din\u00e2mico.<\/p>\n<p>Veja abaixo um exemplo simples:<br \/>\n<strong>classe funcionario<\/strong><\/p>\n<pre class=\"brush: php; title: ; notranslate\" title=\"\">\r\n&lt; ? php\r\nclass Funcionario\r\n{\r\n    private $Codigo;\r\n    private $Nome;\r\n    private $Salario;\r\n    \/\/fun\u00e7\u00e3o para \u201csetar\u201d um valor no atributo salario\r\n    function SetSalario($Salario)\r\n    {\r\n        \/\/antes de passar o valor do salario verificamos se o mesmo e um numero e positivo, se sim, passamos o valor para o atributo\r\n        if (is_numeric($Salario) and ($Salario &gt; 0))\r\n        {\r\n            $this-&gt;Salario = $Salario;\r\n        }\r\n    }\r\n\r\n    function SetNome($Nome)\r\n    {\r\n    \t$this-&gt;Nome = $Nome;\r\n    }\r\n\r\n    function SetCodigo($Codigo)\r\n    {\r\n    \t$this-&gt;Codigo = $Codigo;\r\n    }\r\n\r\n    function Mostrar()\r\n    {\r\n    echo &quot;O nome \u00e9: {$this-&gt;Nome}&lt;br&gt;&quot;;\r\n    echo &quot;O sal\u00e1rio \u00e9: R\\$ {$this-&gt;Salario}&lt;br&gt;&quot;;\r\n    echo &quot;O C\u00f3digo \u00e9: {$this-&gt;Codigo}&quot;;\r\n    }\r\n\r\n}\r\n?&gt;\r\n<\/pre>\n<p><strong>arquivo autoload<\/strong><\/p>\n<pre class=\"brush: php; title: ; notranslate\" title=\"\">\r\n&lt; ? php\r\n\/\/ funcao que carrega as classes automaticamente\r\nfunction __autoload($classe)\r\n{\r\n\t\/\/busca dentro da pasta classes a classe necessaria...\r\n\tinclude_once &quot;classes\/{$classe}.class.php&quot;;\r\n}\r\n\r\n\/\/criando um objeto pessoa\r\n$funcionario = new Funcionario();\r\n$funcionario -&gt; SetCodigo(789);\r\n$funcionario -&gt; SetNome (&#039;Mario Andrade&#039;);\r\n$funcionario -&gt; SetSalario (2500);\r\n$funcionario -&gt; Mostrar();\r\n?&gt;\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>A fun\u00e7\u00e3o autoload \u00e9 utilizada no PHP para fazer o carregamento autom\u00e1tico das classes. Sempre que desejarmos criar um objeto, temos que ter obrigatoriamente a classe respons\u00e1vel pela cria\u00e7\u00e3o do objeto carregada na mem\u00f3ria, caso contr\u00e1rio o PHP retornar\u00e1 um erro. Para carregar classes na mem\u00f3ria podemos carregar todas as classes no inicio do documento [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[54],"tags":[24],"class_list":["post-474","post","type-post","status-publish","format-standard","hentry","category-php","tag-php"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Fun\u00e7\u00e3o autoload no PHP<\/title>\n<meta name=\"description\" content=\"A fun\u00e7\u00e3o autoload \u00e9 utilizada no PHP para fazer o carregamento autom\u00e1tico das suas classes. 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