{"id":10166,"date":"2026-10-29T12:00:00","date_gmt":"2026-10-29T09:00:00","guid":{"rendered":"https:\/\/www.yunuskaytan.com\/?p=10166"},"modified":"2026-10-29T12:00:00","modified_gmt":"2026-10-29T09:00:00","slug":"php-de-oturum-session-yonetimi","status":"publish","type":"post","link":"https:\/\/www.yunuskaytan.com\/en\/yk\/php-de-oturum-session-yonetimi\/","title":{"rendered":"PHP&#8217;de Oturum (session) Y\u00f6netimi"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Web uygulamalar\u0131nda kullan\u0131c\u0131 deneyimini ki\u015fiselle\u015ftirmek ve kullan\u0131c\u0131 durumunu takip etmek en temel gereksinimlerden biridir. Ancak web ileti\u015fiminin temelini olu\u015fturan HTTP protokol\u00fc durum bilgisi tutmayan (stateless) bir yap\u0131ya sahiptir. Bu durum, bir istemcinin sunucuya yapt\u0131\u011f\u0131 her iste\u011fin birbirinden ba\u011f\u0131ms\u0131z de\u011ferlendirilmesi anlam\u0131na gelir. Kullan\u0131c\u0131n\u0131n giri\u015f yap\u0131p yapmad\u0131\u011f\u0131n\u0131, sepetine ekledi\u011fi \u00fcr\u00fcnleri veya tercihlerini takip edebilmek i\u00e7in oturum y\u00f6netim mekanizmalar\u0131na ihtiya\u00e7 duyulur. PHP dilinde bu ihtiyac\u0131 kar\u015f\u0131layan en yayg\u0131n ve yerle\u015fik \u00e7\u00f6z\u00fcm session yap\u0131s\u0131d\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Session Nedir ve Nas\u0131l \u00c7al\u0131\u015f\u0131r?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">PHP oturum mekanizmas\u0131, kullan\u0131c\u0131ya ait verileri istemci taraf\u0131nda de\u011fil, do\u011frudan sunucu taraf\u0131nda ge\u00e7ici dosyalar halinde saklar. Bu s\u00fcre\u00e7 \u015fu temel ad\u0131mlarla i\u015fler:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Kullan\u0131c\u0131 sunucuya bir istek g\u00f6nderdi\u011finde oturum ba\u015flat\u0131l\u0131r.<\/li>\n\n<li>Sunucu, her kullan\u0131c\u0131 i\u00e7in rastgele ve benzersiz bir oturum kimli\u011fi (Session ID) \u00fcretir.<\/li>\n\n<li>Bu benzersiz kimlik, kullan\u0131c\u0131n\u0131n taray\u0131c\u0131s\u0131na genellikle PHPSESSID ad\u0131nda bir \u00e7erez (cookie) olarak iletilir.<\/li>\n\n<li>Kullan\u0131c\u0131 sonraki her istekte bu \u00e7erezi sunucuya geri g\u00f6nderir.<\/li>\n\n<li>Sunucu, gelen kimli\u011fi e\u015fle\u015ftirerek ilgili kullan\u0131c\u0131ya ait verilere sunucu belle\u011finden veya diskinden eri\u015fir.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Verilerin sunucuda tutulmas\u0131, \u00e7erezlere k\u0131yasla daha y\u00fcksek bir veri g\u00fcvenli\u011fi sa\u011flar; \u00e7\u00fcnk\u00fc istemci verilerin i\u00e7eri\u011fini do\u011frudan de\u011fi\u015ftiremez, yaln\u0131zca kimlik de\u011ferini ta\u015f\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Oturum Ba\u015flatma ve Veri Tan\u0131mlama<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">PHP&#8217;de oturum i\u015flemlerini ba\u015flatmak i\u00e7in session_start fonksiyonu kullan\u0131l\u0131r. Bu fonksiyon, mevcut bir oturum varsa onu devam ettirir, yoksa yeni bir oturum ba\u015flat\u0131r. Bu fonksiyonun sayfa \u00e7\u0131kt\u0131s\u0131 (HTML etiketleri veya herhangi bir bo\u015fluk karakteri) g\u00f6nderilmeden \u00f6nce, yani PHP dosyas\u0131n\u0131n en ba\u015f\u0131nda \u00e7a\u011fr\u0131lmas\u0131 zorunludur.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nsession_start();\n\n$_SESSION[\"kullanici_id\"] = 101;\n$_SESSION[\"kullanici_adi\"] = \"yunus\";\n$_SESSION[\"yetki\"] = \"admin\";\n\necho \"Oturum verileri basariyla kaydedildi.\";\n?&gt;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Yukar\u0131daki \u00f6rnekte session_start fonksiyonu ile oturum ba\u015flat\u0131lm\u0131\u015f ve $_SESSION s\u00fcper k\u00fcresel dizisi kullan\u0131larak \u00fc\u00e7 farkl\u0131 anahtara de\u011fer atanm\u0131\u015ft\u0131r. Bu de\u011ferler art\u0131k sunucuda saklanmakta ve bu oturum sonlanana kadar ayn\u0131 taray\u0131c\u0131 oturumundaki di\u011fer sayfalardan eri\u015filebilir durumdad\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Oturum Verilerini Okuma ve Kontrol Etme<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Farkl\u0131 bir sayfada kay\u0131tl\u0131 oturum verilerini okumak i\u00e7in de yine ilk olarak session_start \u00e7a\u011fr\u0131lmal\u0131d\u0131r. Bir verinin varl\u0131\u011f\u0131n\u0131 kontrol etmeden do\u011frudan ekrana yazd\u0131rmaya \u00e7al\u0131\u015fmak hatalara yol a\u00e7abilece\u011fi i\u00e7in isset fonksiyonu ile kontrol yap\u0131lmas\u0131 \u00f6nerilir.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nsession_start();\n\nif (isset($_SESSION[\"kullanici_adi\"])) {\n    echo \"Hos geldiniz, \" . htmlspecialchars($_SESSION[\"kullanici_adi\"], ENT_QUOTES, 'UTF-8');\n    echo \"&lt;br&gt;Yetkiniz: \" . htmlspecialchars($_SESSION[\"yetki\"], ENT_QUOTES, 'UTF-8');\n} else {\n    echo \"Lutfen once giris yapiniz.\";\n}\n?&gt;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu \u00f6rnekte isset kontrol\u00fc ile kullanici_adi anahtar\u0131n\u0131n mevcut olup olmad\u0131\u011f\u0131 denetlenmi\u015ftir. Varsa de\u011ferler g\u00fcvenli bir \u015fekilde ekrana yazd\u0131r\u0131lmakta, yoksa kullan\u0131c\u0131n\u0131n giri\u015f yapmad\u0131\u011f\u0131 anla\u015f\u0131lmaktad\u0131r. htmlspecialchars fonksiyonu, oturum verisinin ekrana bas\u0131l\u0131rken olas\u0131 XSS a\u00e7\u0131klar\u0131na yol a\u00e7mas\u0131n\u0131 \u00f6nlemek amac\u0131yla kullan\u0131lm\u0131\u015ft\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Oturumu G\u00fcncelleme ve Sonland\u0131rma<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Kullan\u0131c\u0131 profilini g\u00fcncelledi\u011finde oturum verilerini de\u011fi\u015ftirmek veya kullan\u0131c\u0131 sistemden \u00e7\u0131k\u0131\u015f yapt\u0131\u011f\u0131nda oturumu tamamen kapatmak gerekebilir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Belirli Bir Veriyi Silme<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00fcm oturumu kapatmadan yaln\u0131zca tek bir oturum de\u011fi\u015fkenini silmek i\u00e7in unset fonksiyonu tercih edilir.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nsession_start();\n\nif (isset($_SESSION[\"yetki\"])) {\n    unset($_SESSION[\"yetki\"]);\n}\n?&gt;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Oturumu Tamamen Kapatma (Logout)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Kullan\u0131c\u0131 \u00e7\u0131k\u0131\u015f yapt\u0131\u011f\u0131nda sunucuda depolanan verilerin, bellekteki de\u011fi\u015fkenlerin ve taray\u0131c\u0131daki oturum \u00e7erezinin tamamen temizlenmesi gerekir. G\u00fcvenli bir \u00e7\u0131k\u0131\u015f i\u015flemi \u015fu \u015fekilde uygulan\u0131r:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nsession_start();\n\n$_SESSION = array();\n\nif (ini_get(\"session.use_cookies\")) {\n    $params = session_get_cookie_params();\n    setcookie(\n        session_name(),\n        '',\n        time() - 42000,\n        $params[\"path\"],\n        $params[\"domain\"],\n        $params[\"secure\"],\n        $params[\"httponly\"]\n    );\n}\n\nsession_destroy();\n?&gt;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu kod blo\u011funda:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>$_SESSION dizisi bo\u015f bir diziye e\u015fitlenerek bellekteki veriler s\u0131f\u0131rlan\u0131r.<\/li>\n\n<li>setcookie fonksiyonu ile taray\u0131c\u0131daki oturum \u00e7erezinin s\u00fcresi ge\u00e7mi\u015f bir zamana ayarlanarak \u00e7erez taray\u0131c\u0131dan silinir.<\/li>\n\n<li>session_destroy fonksiyonu \u00e7a\u011fr\u0131larak sunucudaki oturum dosyas\u0131 fiziksel olarak kald\u0131r\u0131l\u0131r.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Oturum Y\u00f6netiminde G\u00fcvenlik \u00d6nlemleri<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Siber g\u00fcvenlik perspektifinden bak\u0131ld\u0131\u011f\u0131nda, PHP session mekanizmas\u0131 do\u011fru yap\u0131land\u0131r\u0131lmad\u0131\u011f\u0131nda oturum \u00e7alma (Session Hijacking) ve oturum sabitleme (Session Fixation) gibi sald\u0131r\u0131lara a\u00e7\u0131k hale gelir. Bu riskleri en aza indirmek i\u00e7in belirli g\u00fcvenlik \u00f6nlemleri al\u0131nmal\u0131d\u0131r.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Session Fixation Korumas\u0131<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Kullan\u0131c\u0131 yetki seviyesi de\u011fi\u015fti\u011finde (\u00f6rne\u011fin kullan\u0131c\u0131 giri\u015f yapt\u0131\u011f\u0131nda), sunucunun eski oturum kimli\u011fini terk edip yeni bir kimlik \u00fcretmesi gerekir. Bu i\u015flem session_regenerate_id fonksiyonu ile sa\u011flan\u0131r.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\nsession_start();\n\n\/\/ Kullanici dogrulamasi basarili oldugunda:\nsession_regenerate_id(true);\n\n$_SESSION[\"giris_yapti\"] = true;\n$_SESSION[\"kullanici_id\"] = 42;\n?&gt;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Parametre olarak verilen true de\u011feri, eski oturum kimli\u011fine ait verilerin sunucudan silinmesini sa\u011flar. Bu y\u00f6ntem, sald\u0131rgan\u0131n kurbana \u00f6nceden tan\u0131mlad\u0131\u011f\u0131 bir oturum kimli\u011fini dayatmas\u0131n\u0131 engeller.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">G\u00fcvenli \u00c7erez (Cookie) Parametreleri<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Oturum kimli\u011fini ta\u015f\u0131yan \u00e7erezin g\u00fcvenli\u011fi, php.ini ayarlar\u0131 veya session_set_cookie_params fonksiyonu \u00fczerinden s\u0131k\u0131la\u015ft\u0131r\u0131lmal\u0131d\u0131r.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?php\n$cookieParams = [\n    'lifetime' =&gt; 0,\n    'path' =&gt; '\/',\n    'domain' =&gt; '',\n    'secure' =&gt; true,\n    'httponly' =&gt; true,\n    'samesite' =&gt; 'Strict'\n];\n\nsession_set_cookie_params($cookieParams);\nsession_start();\n?&gt;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu parametrelerin g\u00f6revleri \u015funlard\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>secure: \u00c7erezin yaln\u0131zca HTTPS ba\u011flant\u0131lar\u0131 \u00fczerinden iletilmesini sa\u011flar, dinleme sald\u0131r\u0131lar\u0131n\u0131 engeller.<\/li>\n\n<li>httponly: \u00c7ereze JavaScript \u00fczerinden (document.cookie) eri\u015fimi yasaklar, XSS sald\u0131r\u0131lar\u0131nda oturum kimli\u011finin \u00e7al\u0131nmas\u0131n\u0131 zorla\u015ft\u0131r\u0131r.<\/li>\n\n<li>samesite: CSRF sald\u0131r\u0131lar\u0131na kar\u015f\u0131 koruma sa\u011flar; Strict de\u011feri \u00e7erezin \u00fc\u00e7\u00fcnc\u00fc taraf isteklerle g\u00f6nderilmesini engeller.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u00d6zet ve Sonraki Ad\u0131mlar<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">PHP&#8217;de oturum y\u00f6netimi, durum bilgisi tutmayan HTTP yap\u0131s\u0131nda kullan\u0131c\u0131 durumunu takip etmenin temel yoludur. session_start ile ba\u015flayan bu d\u00f6ng\u00fc, $_SESSION s\u00fcper k\u00fcreseli \u00fczerinden veri okuma ve yazma i\u015flemleriyle devam eder, oturum sonland\u0131rma ad\u0131mlar\u0131yla g\u00fcvenli bi\u00e7imde tamamlan\u0131r. Oturum y\u00f6netiminde g\u00fcvenli\u011fi sa\u011flamak i\u00e7in oturum kimli\u011fi yenileme ve HttpOnly, Secure, SameSite gibi \u00e7erez parametrelerini do\u011fru kullanmak kritik \u00f6neme sahiptir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bir sonraki ad\u0131mda, oturum verilerini dosya sistemi yerine Redis veya MySQL gibi merkezi veri tabanlar\u0131nda saklamay\u0131 sa\u011flayan \u00f6zel oturum i\u015fleyicileri (custom session handlers) konusunu inceleyebilirsiniz.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PHP oturum (session) mekanizmas\u0131n\u0131n temellerini, veri saklama ve silme ad\u0131mlar\u0131n\u0131, siber g\u00fcvenlik a\u00e7\u0131s\u0131ndan dikkat edilmesi gereken kritik noktalar\u0131 bu rehberde bulabilirsiniz.<\/p>","protected":false},"author":1,"featured_media":10167,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[301],"tags":[313,213,322,321,323],"class_list":["post-10166","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-php","tag-backend-gelistirme","tag-php","tag-php-oturum-yonetimi","tag-php-session","tag-web-guvenligi"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - 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