{"id":1044,"date":"2024-05-20T20:13:49","date_gmt":"2024-05-20T23:13:49","guid":{"rendered":"https:\/\/thiagorossi.com.br\/blog\/?p=1044"},"modified":"2025-12-02T18:19:36","modified_gmt":"2025-12-02T21:19:36","slug":"cookies-e-sessions-php","status":"publish","type":"post","link":"https:\/\/thiagorossi.com.br\/blog\/cookies-e-sessions-php\/","title":{"rendered":"Cookies e Sessions PHP"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Tempo de leitura: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutos<\/span><\/span>\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Cookies e Sessions PHP<\/strong>: <strong>Cookies<\/strong> e <strong>Sess\u00f5es<\/strong> s\u00e3o mecanismos cruciais no desenvolvimento web que resolvem o problema da <strong>natureza <em>stateless<\/em> (sem estado)<\/strong> do protocolo HTTP. Eles permitem que as aplica\u00e7\u00f5es PHP &#8220;se lembrem&#8221; do usu\u00e1rio e mantenham informa\u00e7\u00f5es persistentes (como status de login ou itens de um carrinho de compras) entre diferentes requisi\u00e7\u00f5es de p\u00e1gina.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">1. \ud83c\udf6a Cookies: Armazenamento no Cliente<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Um <strong>Cookie<\/strong> \u00e9 um pequeno arquivo de texto (ou um peda\u00e7o de dados) que o servidor web envia para ser armazenado no <strong>navegador do usu\u00e1rio (cliente)<\/strong>. Ele \u00e9 reenviado ao servidor a cada requisi\u00e7\u00e3o subsequente, permitindo que o servidor identifique o usu\u00e1rio.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">A. Criando Cookies<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Voc\u00ea usa a fun\u00e7\u00e3o <strong><code>setcookie()<\/code><\/strong> para criar um cookie no navegador do usu\u00e1rio. Esta fun\u00e7\u00e3o deve ser chamada <strong>antes<\/strong> de qualquer sa\u00edda HTML ser enviada ao navegador.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">PHP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\n\/\/ setcookie(nome, valor, expira\u00e7\u00e3o, caminho, dom\u00ednio, seguran\u00e7a, httpOnly)\n\/\/ Expira em 1 hora (tempo atual + 3600 segundos)\nsetcookie(\"nome_do_cookie\", \"valor_do_cookie\", time() + 3600, \"\/\"); \n\n\/\/ Cookie persistente (expira em 30 dias)\nsetcookie(\"preferencia_tema\", \"dark\", time() + (86400 * 30), \"\/\"); \n?&gt;\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">B. Lendo Cookies<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Os cookies enviados pelo navegador s\u00e3o acess\u00edveis na superglobal <strong><code>$_COOKIE<\/code><\/strong>, que \u00e9 um array associativo.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">PHP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nif(isset($_COOKIE&#91;\"nome_do_cookie\"])) {\n    echo \"Valor do cookie: \" . $_COOKIE&#91;\"nome_do_cookie\"];\n} else {\n    echo \"Cookie n\u00e3o encontrado.\";\n}\n?&gt;\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">C. Excluindo Cookies<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Para excluir um cookie, voc\u00ea deve chamar <strong><code>setcookie()<\/code><\/strong> novamente com o <strong>mesmo nome<\/strong> e definir um tempo de expira\u00e7\u00e3o que esteja <strong>no passado<\/strong>.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">PHP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\n\/\/ Define a expira\u00e7\u00e3o para um momento anterior (ex: h\u00e1 1 segundo)\nsetcookie(\"nome_do_cookie\", \"\", time() - 1, \"\/\"); \n?&gt;\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">2. \ud83d\udd11 Sessions: Armazenamento no Servidor<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Uma <strong>Sess\u00e3o<\/strong> \u00e9 um mecanismo que armazena dados de estado no <strong>servidor<\/strong>, n\u00e3o no cliente. O servidor atribui um identificador \u00fanico de sess\u00e3o (Session ID) a cada usu\u00e1rio.<\/p>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Como Funciona<\/h3>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li class=\"has-medium-font-size\">O <em>script<\/em> PHP chama <code>session_start()<\/code>.<\/li>\n\n\n\n<li class=\"has-medium-font-size\">O servidor gera um <strong>Session ID<\/strong> (ex: <code>phpsessid=abc123xyz<\/code>).<\/li>\n\n\n\n<li class=\"has-medium-font-size\">Este Session ID \u00e9 enviado ao navegador, geralmente atrav\u00e9s de um <strong>cookie tempor\u00e1rio<\/strong>.<\/li>\n\n\n\n<li class=\"has-medium-font-size\">Em requisi\u00e7\u00f5es subsequentes, o navegador envia o Session ID de volta.<\/li>\n\n\n\n<li class=\"has-medium-font-size\">O servidor usa o ID para recuperar o bloco de dados de sess\u00e3o armazenado em disco (ou mem\u00f3ria), que \u00e9 carregado na superglobal <code>$_SESSION<\/code>.<\/li>\n<\/ol>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">A. Iniciando e Usando Sess\u00f5es<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Todas as p\u00e1ginas que usam sess\u00f5es <strong>devem<\/strong> chamar <strong><code>session_start()<\/code><\/strong> no topo do <em>script<\/em>, <strong>antes<\/strong> de qualquer sa\u00edda de dados.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">PHP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\n\/\/ Deve ser chamada antes de qualquer sa\u00edda\nsession_start();\n\n\/\/ Armazenando dados na sess\u00e3o (lado do servidor)\n$_SESSION&#91;'nome'] = 'Jo\u00e3o';\n$_SESSION&#91;'idade'] = 30;\n\n\/\/ Recuperando valores\necho \"Bem-vindo(a), \" . $_SESSION&#91;'nome'];\n?&gt;\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">B. Encerrando e Destruindo Sess\u00f5es<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Para remover todos os dados de sess\u00e3o e encerrar a sess\u00e3o de forma segura:<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">PHP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nsession_start();\n\n\/\/ 1. Limpa todas as vari\u00e1veis da superglobal $_SESSION\n$_SESSION = &#91;];\n\n\/\/ 2. Destr\u00f3i o cookie de sess\u00e3o no cliente\nif (ini_get(\"session.use_cookies\")) {\n    $params = session_get_cookie_params();\n    setcookie(session_name(), '', time() - 42000,\n        $params&#91;\"path\"], $params&#91;\"domain\"],\n        $params&#91;\"secure\"], $params&#91;\"httponly\"]\n    );\n}\n\n\/\/ 3. Destr\u00f3i os dados de sess\u00e3o armazenados no servidor\/disco\nsession_destroy();\n?&gt;\n<\/code><\/pre>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">3. \u2696\ufe0f Compara\u00e7\u00e3o e Seguran\u00e7a<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">A escolha entre Cookies e Sess\u00f5es depende da sensibilidade e do volume dos dados.<\/p>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Caracter\u00edstica<\/strong><\/td><td><strong>Cookies<\/strong><\/td><td><strong>Sess\u00f5es<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Local de Armazenamento<\/strong><\/td><td><strong>Cliente<\/strong> (Navegador)<\/td><td><strong>Servidor<\/strong> (Disco\/Mem\u00f3ria)<\/td><\/tr><tr><td><strong>Seguran\u00e7a<\/strong><\/td><td><strong>Baixa.<\/strong> Dados vis\u00edveis no navegador, podem ser interceptados ou alterados.<\/td><td><strong>Alta.<\/strong> Apenas o ID (identificador) \u00e9 vis\u00edvel para o cliente; os dados ficam seguros no servidor.<\/td><\/tr><tr><td><strong>Capacidade\/Limite<\/strong><\/td><td>Limitada (geralmente 4KB por cookie).<\/td><td>Praticamente ilimitada (depende do servidor).<\/td><\/tr><tr><td><strong>Persist\u00eancia<\/strong><\/td><td>Podem ser persistentes (configurado pela data de expira\u00e7\u00e3o).<\/td><td>Geralmente tempor\u00e1ria (expiram quando o navegador fecha ou por tempo limite).<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Boas Pr\u00e1ticas de Seguran\u00e7a<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-medium-font-size\"><strong>Sess\u00f5es para Dados Sens\u00edveis:<\/strong> Use sess\u00f5es (vari\u00e1veis <code>$_SESSION<\/code>) para armazenar dados de login, tokens de autentica\u00e7\u00e3o ou qualquer informa\u00e7\u00e3o confidencial.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Flag <code>HttpOnly<\/code>:<\/strong> Ao configurar cookies (incluindo o cookie de Session ID), use a flag <strong><code>HttpOnly<\/code><\/strong> para impedir que <em>scripts<\/em> do lado do cliente (JavaScript) acessem o cookie. Isso mitiga ataques XSS.<\/li>\n\n\n\n<li class=\"has-medium-font-size\"><strong>Regenera\u00e7\u00e3o de ID de Sess\u00e3o:<\/strong> Chame <strong><code>session_regenerate_id(true)<\/code><\/strong> ap\u00f3s qualquer mudan\u00e7a de privil\u00e9gio (ex: ap\u00f3s um login bem-sucedido) para prevenir ataques de <strong>Session Fixation<\/strong>.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:35px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\">\u2705 Conclus\u00e3o Cookies e Sessions PHP<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Cookies e Sessions PHP:<\/strong> Cookies e Sess\u00f5es s\u00e3o as ferramentas prim\u00e1rias para transformar o HTTP <em>stateless<\/em> em uma experi\u00eancia interativa. <strong>Cookies<\/strong> s\u00e3o melhores para armazenar dados n\u00e3o sens\u00edveis e prefer\u00eancias do usu\u00e1rio (lado do cliente). <strong>Sess\u00f5es<\/strong> s\u00e3o o padr\u00e3o de seguran\u00e7a para armazenar informa\u00e7\u00f5es sens\u00edveis, como dados de login e carrinhos de compra, mantendo a integridade dos dados no lado do servidor, com apenas um identificador de sess\u00e3o exposto ao cliente. O uso seguro e combinado desses mecanismos \u00e9 essencial para aplica\u00e7\u00f5es PHP modernas.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Toda jornada tem um in\u00edcio, e o in\u00edcio para se tornar um desenvolvedor back-end \u00e9 dominar as seguintes tecnologias, que voc\u00ea encontra aqui mesmo:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/sql\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/05\/Capa-Artigos-2.webp\" alt=\"SQL\" class=\"wp-image-942\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/05\/Capa-Artigos-2.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/05\/Capa-Artigos-2-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">SQL<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/php\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/11\/Capa-PHP.png\" alt=\"Capa Curso PHP\" class=\"wp-image-2835\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/11\/Capa-PHP.png 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/11\/Capa-PHP-300x169.png 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">PHP<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"\/category\/laravel\"><img loading=\"lazy\" decoding=\"async\" width=\"758\" height=\"426\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/11\/Laravel.webp\" alt=\"Laravel\" class=\"wp-image-1642\" srcset=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/11\/Laravel.webp 758w, https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/11\/Laravel-300x169.webp 300w\" sizes=\"auto, (max-width: 758px) 100vw, 758px\" \/><\/a><figcaption class=\"wp-element-caption\">Laravel<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">E se voc\u00ea gosta do nosso conte\u00fado, n\u00e3o deixe de contribuir adquirindo os servi\u00e7os e produtos dos nossos apoiadores e empresas que somos associados:<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/hostinger.com.br\/?REFERRALCODE=1THIAGO62\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/03\/hostinger.png\" alt=\"Hospedagem Hostinger\" class=\"wp-image-92\"\/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/amzn.to\/3SNDYlc\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/08\/ofertas-amazon.webp\" alt=\"Ofertas Amazon\" class=\"wp-image-1308\"\/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/amzn.to\/3SNKmt0\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"250\" src=\"https:\/\/thiagorossi.com.br\/blog\/wp-content\/uploads\/2024\/08\/amazonprime.webp\" alt=\"Amazon Prime\" class=\"wp-image-1307\"\/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Tempo de leitura: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutos<\/span><\/span>Cookies e Sessions PHP: Cookies e Sess\u00f5es s\u00e3o mecanismos cruciais no desenvolvimento web que resolvem&#8230;<\/p>\n","protected":false},"author":1,"featured_media":2835,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-1044","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-php","wpcat-11-id"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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