{"id":20229,"date":"2015-01-22T18:10:00","date_gmt":"2015-01-22T18:10:00","guid":{"rendered":"https:\/\/kiencang.net\/2015\/01\/22\/session-trong-php\/"},"modified":"2015-01-22T18:10:00","modified_gmt":"2015-01-22T18:10:00","slug":"session-trong-php","status":"publish","type":"post","link":"https:\/\/kiencang.net\/session-trong-php\/","title":{"rendered":"Session trong PHP"},"content":{"rendered":"\n<p>Session \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 l\u01b0u tr\u1eef th\u00f4ng tin trong bi\u1ebfn v\u00e0 s\u1eed d\u1ee5ng n\u00f3 t\u1eeb trang n\u00e0y sang trang kh\u00e1c. C\u00e1c bi\u1ebfn th\u00f4ng th\u01b0\u1eddng trong PHP ch\u1ec9 l\u00e0m vi\u1ec7c t\u1ea1i trang \u0111\u00f3, s\u00e1ng trang kh\u00e1c s\u1ebd m\u1ea5t, session th\u00ec kh\u00f4ng b\u1ecb nh\u01b0 th\u1ebf.<\/p>\n\n\n\n<p>Kh\u00f4ng gi\u1ed1ng cookie, th\u00f4ng tin kh\u00f4ng \u0111\u01b0\u1ee3c l\u01b0u trong m\u00e1y t\u00ednh c\u1ee7a ng\u01b0\u1eddi d\u00f9ng.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_60 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >M\u1ee5c l\u1ee5c<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\" role=\"button\"><label for=\"item-6577d69498d3b\" ><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input aria-label=\"Toggle\" aria-label=\"item-6577d69498d3b\"  type=\"checkbox\" id=\"item-6577d69498d3b\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/kiencang.net\/session-trong-php\/#Session_trong_PHP_la_gi\" title=\"Session trong PHP l\u00e0 g\u00ec?\">Session trong PHP l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kiencang.net\/session-trong-php\/#Cach_tao_Session_trong_PHP\" title=\"C\u00e1ch t\u1ea1o Session trong PHP\">C\u00e1ch t\u1ea1o Session trong PHP<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kiencang.net\/session-trong-php\/#Lay_gia_tri_cua_bien_session_trong_PHP\" title=\"L\u1ea5y gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ebfn session trong PHP\">L\u1ea5y gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ebfn session trong PHP<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kiencang.net\/session-trong-php\/#Thay_doi_bien_Session\" title=\"Thay \u0111\u1ed5i bi\u1ebfn Session\">Thay \u0111\u1ed5i bi\u1ebfn Session<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/kiencang.net\/session-trong-php\/#Huy_bo_Session\" title=\"H\u1ee7y b\u1ecf Session\">H\u1ee7y b\u1ecf Session<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Session_trong_PHP_la_gi\"><\/span>Session trong PHP l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Khi b\u1ea1n l\u00e0m vi\u1ec7c v\u1edbi m\u1ed9t \u1ee9ng d\u1ee5ng n\u00e0o \u0111\u00f3, b\u1ea1n m\u1edf n\u00f3 ra, th\u1ef1c hi\u1ec7n m\u1ed9t s\u1ed1 thay \u0111\u1ed5i v\u00e0 r\u1ed3i b\u1ea1n \u0111\u00f3ng n\u00f3 l\u1ea1i. \u0110i\u1ec1u \u0111\u00f3 g\u1ecdi l\u00e0 session \u2013 hi\u1ec3u theo ti\u1ebfng Vi\u1ec7t ngh\u0129a l\u00e0 phi\u00ean l\u00e0m vi\u1ec7c. <\/p>\n\n\n\n<p>M\u00e1y t\u00ednh bi\u1ebft b\u1ea1n l\u00e0 ai. N\u00f3 bi\u1ebft khi n\u00e0o b\u1ea1n b\u1eadt \u1ee9ng d\u1ee5ng v\u00e0 khi n\u00e0o t\u1eaft. Nh\u01b0ng tr\u00ean internet c\u00f3 m\u1ed9t v\u1ea5n \u0111\u1ec1: m\u00e1y ch\u1ee7 web kh\u00f4ng bi\u1ebft b\u1ea1n l\u00e0 ai ho\u1eb7c b\u1ea1n l\u00e0m c\u00e1i g\u00ec, b\u1edfi \u0111\u1ecba ch\u1ec9 HTTP kh\u00f4ng duy tr\u00ec tr\u1ea1ng th\u00e1i.<\/p>\n\n\n\n<p>Bi\u1ebfn session gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 n\u00e0y b\u1eb1ng c\u00e1ch l\u01b0u tr\u1eef th\u00f4ng tin user \u0111\u01b0\u1ee3c d\u00f9ng qua nhi\u1ec1u trang (v\u00ed du: username, m\u00e0u s\u1eafc \u01b0a th\u00edch, \u2026). Theo m\u1eb7c \u0111\u1ecbnh, c\u00e1c bi\u1ebfn session v\u1eabn c\u00f2n t\u1ed3n t\u1ea1i cho \u0111\u1ebfn khi ng\u01b0\u1eddi d\u00f9ng \u0111\u00f3ng tr\u00ecnh duy\u1ec7t.<\/p>\n\n\n\n<p>V\u00ec v\u1eady bi\u1ebfn session n\u1eafm gi\u1eef th\u00f4ng tin v\u1ec1 m\u1ed9t user nh\u1ea5t \u0111\u1ecbnh v\u00e0 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c trang trong \u1ee9ng d\u1ee5ng \u0111\u00f3<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cach_tao_Session_trong_PHP\"><\/span>C\u00e1ch t\u1ea1o Session trong PHP<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>B\u1ea1n kh\u1edfi t\u1ea1o m\u1ed9t session b\u1eb1ng c\u00e1ch d\u00f9ng h\u00e0m&nbsp;<strong>session_start()<\/strong><\/p>\n\n\n\n<p>Bi\u1ebfn session \u0111\u01b0\u1ee3c g\u1eafn v\u1edbi bi\u1ebfn to\u00e0n c\u1ee5c l\u00e0&nbsp;<strong>$_SESSION<\/strong><\/p>\n\n\n\n<p>B\u00e2y gi\u1edd b\u1ea1n h\u00e3y t\u1ea1o m\u1ed9t trang m\u1edbi c\u00f3 t\u00ean \u201cvidu_session1.php\u201d. Trong trang n\u00e0y, b\u1ea1n t\u1ea1o session PHP v\u00e0 kh\u1edfi t\u1ea1o m\u1ed9t s\u1ed1 bi\u1ebfn session:<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\n\/\/ Start the session\nsession_start();\n?>\n&lt;!DOCTYPE html>\n&lt;html>\n&lt;body>\n&lt;?php\n\/\/ Set session variables\n$_SESSION&#91;\"doi_bong_yeu_thich\"] = \"B\u00e1c Xa\";\n$_SESSION&#91;\"mon_the_thao_ua_thich\"] = \"Ch\u1ea1y b\u1ed9\";\necho \"C\u00e1c bi\u1ebfn session \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ea1o\";\n?>\n\n&lt;\/body>\n&lt;\/html><\/code><\/pre>\n\n\n\n<p>Ch\u00fa \u00fd: h\u00e0m session_start() ph\u1ea3i \u0111\u01b0\u1ee3c vi\u1ebft \u0111\u1ea7u ti\u00ean trong trang, \u0111\u1ee9ng TR\u01af\u1edaC th\u1ebb HTML<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Lay_gia_tri_cua_bien_session_trong_PHP\"><\/span>L\u1ea5y gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ebfn session trong PHP<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Ti\u1ebfp theo ch\u00fang ta t\u1ea1o trang th\u1ee9 hai c\u00f3 t\u00ean \u201cvidu_session2.php\u201d. T\u1eeb trang n\u00e0y, ch\u00fang ta truy c\u1eadp th\u00f4ng tin session \u0111\u01b0\u1ee3c t\u1ea1o t\u1eeb trang tr\u01b0\u1edbc \u0111\u00f3 (vidu_session1.php).<\/p>\n\n\n\n<p>Ch\u00fa \u00fd l\u00e0 t\u1ea5t c\u1ea3 gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ebfn session \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef trong bi\u1ebfn to\u00e0n c\u1ee5c c\u00f3 t\u00ean $_SESSION:<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nsession_start();\n?>\n&lt;!DOCTYPE html>\n&lt;html>\n&lt;body>\n&lt;?php\n\/\/ \u0110\u01b0a ra m\u00e0n h\u00ecnh c\u00e1c bi\u1ebfn session \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o t\u1eeb trang tr\u01b0\u1edbc\necho \"\u0110\u1ed9i b\u00f3ng y\u00eau th\u00edch l\u00e0: \" . $_SESSION&#91;\"doi_bong_yeu_thich\"] . \".&lt;br>\";\necho \"M\u00f4n th\u1ec3 thao y\u00eau th\u00edch l\u00e0: \" . $_SESSION&#91;\"mon_the_thao_ua_thich\"]. \".\";\n\n?>\n&lt;\/body>\n&lt;\/html><\/code><\/pre>\n\n\n\n<p>M\u1ed9t c\u00e1ch kh\u00e1c \u0111\u1ec3 \u0111\u01b0a ra t\u1ea5t c\u1ea3 c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a bi\u1ebfn session (t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t user n\u00e0o \u0111\u00f3) b\u1eb1ng \u0111o\u1ea1n code sau: <\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nsession_start();\n?>\n&lt;!DOCTYPE html>\n&lt;html>\n&lt;body>\n\n&lt;?php\nprint_r($_SESSION);\n?>\n\n&lt;\/body>\n&lt;\/html><\/code><\/pre>\n\n\n\n<p><strong>N\u00f3 l\u00e0m vi\u1ec7c th\u1ebf n\u00e0o? L\u00e0m sao \u0111\u1ec3 n\u00f3 bi\u1ebft \u0111\u01b0\u1ee3c t\u00f4i?<\/strong><\/p>\n\n\n\n<p>H\u1ea7u h\u1ebft session t\u1ea1o kh\u00f3a user tr\u00ean m\u00e1y t\u00ednh gi\u1ed1ng nh\u01b0 sau: <code>16483986038fsdf4996qeroi58<\/code>. Sau \u0111\u00f3 khi session \u0111\u01b0\u1ee3c m\u1edf tr\u00ean trang kh\u00e1c, n\u00f3 s\u1ebd qu\u00e9t th\u00f4ng tin c\u1ee7a kh\u00f3a n\u00e0y. N\u1ebfu ph\u00f9 h\u1ee3p, n\u00f3 s\u1ebd cho ph\u00e9p truy c\u1eadp session, n\u1ebfu kh\u00f4ng n\u00f3 s\u1ebd kh\u1edfi t\u1ea1o session m\u1edbi.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Thay_doi_bien_Session\"><\/span>Thay \u0111\u1ed5i bi\u1ebfn Session<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u0110\u1ec3 thay \u0111\u1ed5i bi\u1ebfn session, \u0111\u01a1n gi\u1ea3n ch\u1ec9 c\u1ea7n ghi \u0111\u00e8 l\u00ean n\u00f3, v\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nsession_start();\n?>\n&lt;!DOCTYPE html>\n&lt;html>\n&lt;body>\n\n&lt;?php\n\/\/ to change a session variable, just overwrite it\n$_SESSION&#91;\"doi_bong_yeu_thich\"] = \"R\u00ea An\";\nprint_r($_SESSION);\n?>\n\n&lt;\/body>\n&lt;\/html><\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Huy_bo_Session\"><\/span>H\u1ee7y b\u1ecf Session<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u0110\u1ec3 lo\u1ea1i b\u1ecf t\u1ea5t c\u1ea3 c\u00e1c bi\u1ebfn session to\u00e0n c\u1ee5c v\u00e0 h\u1ee7y session, ch\u00fang ta s\u1eed d\u1ee5ng h\u00e0m session_unset() v\u00e0 session_destroy():<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nsession_start();\n?>\n&lt;!DOCTYPE html>\n&lt;html>\n&lt;body>\n\n&lt;?php\n\/\/ Lo\u1ea1i b\u1ecf t\u1ea5t c\u1ea3 c\u00e1c session\nsession_unset();\n\n\/\/ H\u1ee7y c\u00e1c session\nsession_destroy();\n?>\n\n&lt;\/body>\n&lt;\/html><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Session \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 l\u01b0u tr\u1eef th\u00f4ng tin trong bi\u1ebfn v\u00e0 s\u1eed d\u1ee5ng n\u00f3 t\u1eeb trang n\u00e0y sang trang kh\u00e1c. C\u00e1c bi\u1ebfn th\u00f4ng th\u01b0\u1eddng trong PHP ch\u1ec9 l\u00e0m vi\u1ec7c t\u1ea1i trang \u0111\u00f3, s\u00e1ng trang kh\u00e1c s\u1ebd m\u1ea5t, session th\u00ec kh\u00f4ng b\u1ecb nh\u01b0 th\u1ebf. Kh\u00f4ng gi\u1ed1ng cookie, th\u00f4ng tin kh\u00f4ng \u0111\u01b0\u1ee3c l\u01b0u trong m\u00e1y t\u00ednh c\u1ee7a &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[238],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Session trong PHP &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kiencang.net\/session-trong-php\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Session trong PHP &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"Session \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 l\u01b0u tr\u1eef th\u00f4ng tin trong bi\u1ebfn v\u00e0 s\u1eed d\u1ee5ng n\u00f3 t\u1eeb trang n\u00e0y sang trang kh\u00e1c. C\u00e1c bi\u1ebfn th\u00f4ng th\u01b0\u1eddng trong PHP ch\u1ec9 l\u00e0m vi\u1ec7c t\u1ea1i trang \u0111\u00f3, s\u00e1ng trang kh\u00e1c s\u1ebd m\u1ea5t, session th\u00ec kh\u00f4ng b\u1ecb nh\u01b0 th\u1ebf. 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C\u00e1c bi\u1ebfn th\u00f4ng th\u01b0\u1eddng trong PHP ch\u1ec9 l\u00e0m vi\u1ec7c t\u1ea1i trang \u0111\u00f3, s\u00e1ng trang kh\u00e1c s\u1ebd m\u1ea5t, session th\u00ec kh\u00f4ng b\u1ecb nh\u01b0 th\u1ebf. 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