{"id":10155,"date":"2026-10-28T08:00:00","date_gmt":"2026-10-28T05:00:00","guid":{"rendered":"https:\/\/www.yunuskaytan.com\/?p=10155"},"modified":"2026-10-28T08:00:00","modified_gmt":"2026-10-28T05:00:00","slug":"php-de-hata-ayiklama-yontemleri","status":"publish","type":"post","link":"https:\/\/www.yunuskaytan.com\/en\/yk\/php-de-hata-ayiklama-yontemleri\/","title":{"rendered":"PHP’de Hata Ay\u0131klama Y\u00f6ntemleri"},"content":{"rendered":"\n

Yaz\u0131l\u0131m geli\u015ftirme s\u00fcrecinin en do\u011fal par\u00e7alar\u0131ndan biri hatalarla kar\u015f\u0131la\u015fmakt\u0131r. Kod yazarken ortaya \u00e7\u0131kan mant\u0131ksal, s\u00f6zdizimsel veya \u00e7al\u0131\u015fma zaman\u0131 hatalar\u0131n\u0131 do\u011fru \u015fekilde tespit etmek, geli\u015ftiricinin zaman\u0131n\u0131 verimli kullanmas\u0131n\u0131 sa\u011flar. PHP d\u00fcnyas\u0131nda hata ay\u0131klama (debugging), uygulaman\u0131n b\u00fcy\u00fckl\u00fc\u011f\u00fcne ve \u00e7al\u0131\u015ft\u0131\u011f\u0131 ortama g\u00f6re farkl\u0131 ara\u00e7 ve y\u00f6ntemlerle ger\u00e7ekle\u015ftirilir. Bu rehberde, PHP projelerinde hatalar\u0131 s\u0131f\u0131rdan ad\u0131m ad\u0131m nas\u0131l yakalayabilece\u011finizi ve \u00e7\u00f6z\u00fcmleyebilece\u011finizi inceleyece\u011fiz.<\/p>\n\n\n\n

PHP Hata Raporlama Mekanizmas\u0131<\/h2>\n\n\n\n

PHP, \u00e7al\u0131\u015fma s\u0131ras\u0131nda kar\u015f\u0131la\u015ft\u0131\u011f\u0131 durumlar\u0131 farkl\u0131 hata seviyelerinde s\u0131n\u0131fland\u0131r\u0131r. Bu seviyeler aras\u0131nda uyar\u0131lar (Warnings), bildirimler (Notices) ve kritik \u00f6l\u00fcmc\u00fcl hatalar (Fatal Errors) yer al\u0131r. Yerel geli\u015ftirme ortam\u0131nda hatalar\u0131n t\u00fcm\u00fcn\u00fc ekranda g\u00f6rebilmek, problemin kayna\u011f\u0131n\u0131 h\u0131zl\u0131ca anlaman\u0131n ilk ad\u0131m\u0131d\u0131r.<\/p>\n\n\n\n

Varsay\u0131lan yap\u0131land\u0131rmada PHP, g\u00fcvenlik gerek\u00e7esiyle hatalar\u0131 ekranda g\u00f6stermeyebilir. Geli\u015ftirme a\u015famas\u0131nda bu davran\u0131\u015f\u0131 de\u011fi\u015ftirmek i\u00e7in beti\u011finizin en ba\u015f\u0131na hata raporlama y\u00f6nergelerini ekleyebilirsiniz.<\/p>\n\n\n\n

ini_set('display_errors', '1');\nini_set('display_startup_errors', '1');\nerror_reporting(E_ALL);<\/code><\/pre>\n\n\n\n
Yukar\u0131daki kod blo\u011fu \u015fu i\u015flemleri ger\u00e7ekle\u015ftirir:<\/p>\n\n\n\n
    \n
  • ini_set(‘display_errors’, ‘1’) komutu, \u00e7al\u0131\u015fma zaman\u0131 hatalar\u0131n\u0131n taray\u0131c\u0131 ekran\u0131na veya terminale yazd\u0131r\u0131lmas\u0131n\u0131 zorunlu k\u0131lar.<\/li>\n\n
  • ini_set(‘display_startup_errors’, ‘1’) komutu, PHP motorunun ba\u015flat\u0131lmas\u0131 esnas\u0131nda olu\u015fan hatalar\u0131n da g\u00f6r\u00fcn\u00fcr olmas\u0131n\u0131 sa\u011flar.<\/li>\n\n
  • error_reporting(E_ALL) ifadesi, bildirimler ve s\u00f6zdizimi uyar\u0131lar\u0131 dahil olmak \u00fczere mevcut t\u00fcm hata seviyelerinin yakalanmas\u0131n\u0131 bildirir.<\/li>\n<\/ul>\n\n\n\n
    Bu ayarlar merkezi olarak php.ini dosyas\u0131ndan da y\u00f6netilebilir. Geli\u015ftirme ortam\u0131ndaki php.ini dosyas\u0131nda display_errors = On \u015feklinde bir tan\u0131mlama yapmak, her dosyan\u0131n ba\u015f\u0131na tek tek kod ekleme gereksinimini ortadan kald\u0131r\u0131r.<\/p>\n\n\n\n
    De\u011fi\u015fkenleri Ekrana Yazd\u0131rarak \u0130nceleme<\/h2>\n\n\n\n
    En yayg\u0131n ve h\u0131zl\u0131 kontrol y\u00f6ntemi, \u00e7al\u0131\u015fma an\u0131ndaki de\u011fi\u015fkenlerin t\u00fcr\u00fcn\u00fc ve i\u00e7eri\u011fini do\u011frudan ekrana d\u00f6kmektir. Bu i\u015flem i\u00e7in s\u0131kl\u0131kla echo yerine de\u011fi\u015fkenin tipini de belirten fonksiyonlar tercih edilir.<\/p>\n\n\n\n
    var_dump ve print_r Kullan\u0131m\u0131<\/h3>\n\n\n\n
    echo komutu yaln\u0131zca dizgeleri (string) basmak i\u00e7in uygundur; dizileri veya nesneleri ekrana yazd\u0131ramaz. Bu noktada var_dump() ve print_r() devreye girer.<\/p>\n\n\n\n
    $kullanici = [\n    'id' => 104,\n    'ad' => 'Ahmet',\n    'aktif' => true,\n    'roller' => ['admin', 'editor']\n];\n\necho \"<pre>\";\nvar_dump($kullanici);\necho \"<\/pre>\";\nexit;<\/code><\/pre>\n\n\n\n
    Bu \u00f6rnekte yer alan komutlar\u0131n i\u015flevi \u015funlard\u0131r:<\/p>\n\n\n\n
      \n
    • pre etiketleri, \u00e7\u0131kt\u0131n\u0131n HTML \u00fczerinde sat\u0131r ba\u015flar\u0131 ve girintilerle okunabilir bir bi\u00e7imde sunulmas\u0131n\u0131 sa\u011flar.<\/li>\n\n
    • var_dump() fonksiyonu de\u011fi\u015fkenin i\u00e7eri\u011fini, boyutunu, dizideki anahtarlar\u0131 ve de\u011fi\u015fken tiplerini ayr\u0131nt\u0131l\u0131 olarak raporlar.<\/li>\n\n
    • exit (veya die()) komutu ise beti\u011fin \u00e7al\u0131\u015fmas\u0131n\u0131 o sat\u0131rda durdurarak sonraki kodlar\u0131n \u00e7al\u0131\u015fmas\u0131n\u0131 engeller. Bu sayede yaln\u0131zca hedeflenen ad\u0131mdaki durum analiz edilir.<\/li>\n<\/ul>\n\n\n\n
      Hatalar\u0131 Dosyalara Kaydetme (Logging)<\/h2>\n\n\n\n
      Hatalar\u0131 ekrana basmak yerel ortamda pratik olsa da arka planda \u00e7al\u0131\u015fan s\u00fcre\u00e7lerde (cron job, API istekleri) veya canl\u0131 sunucularda ekrana yaz\u0131 d\u00f6kmek g\u00fcvenli de\u011fildir. Bu durumlarda hatalar\u0131n bir log dosyas\u0131na yaz\u0131lmas\u0131 gerekir.<\/p>\n\n\n\n
      error_log Fonksiyonu<\/h3>\n\n\n\n
      PHP’nin yerle\u015fik error_log() fonksiyonu, \u00f6zel mesajlar\u0131 do\u011frudan sunucu log dosyas\u0131na veya belirtece\u011finiz \u00f6zel bir dosyaya aktar\u0131r.<\/p>\n\n\n\n
      $gelen_veri = null;\n\nif (is_null($gelen_veri)) {\n    error_log(\"Hata: Beklenen kullan\u0131c\u0131 verisi bo\u015f geldi! Tarih: \" . date('Y-m-d H:i:s'), 3, __DIR__ . '\/app_errors.log');\n}<\/code><\/pre>\n\n\n\n
      Bu kod blo\u011funda error_log fonksiyonunun ikinci parametresi olan 3 de\u011feri, mesaj\u0131n \u00fc\u00e7\u00fcnc\u00fc parametrede belirtilen dosya yoluna eklenerek (append modunda) yaz\u0131laca\u011f\u0131n\u0131 ifade eder. B\u00f6ylece uygulaman\u0131n ak\u0131\u015f\u0131 kesilmeden beklenmeyen durumlar arka planda ar\u015fivlenir.<\/p>\n\n\n\n
      \u0130stisna Y\u00f6netimi (Exception Handling)<\/h2>\n\n\n\n
      PHP 7 ve sonraki s\u00fcr\u00fcmlerde bir\u00e7ok \u00f6l\u00fcmc\u00fcl hata art\u0131k istisna (Exception) ya da Error nesnesi olarak f\u0131rlat\u0131lmaktad\u0131r. Bu yap\u0131, beklenmeyen bir durumda program\u0131n tamamen \u00e7\u00f6kmesini engellemek ve hatay\u0131 kontroll\u00fc bir \u015fekilde y\u00f6netmek i\u00e7in kullan\u0131l\u0131r.<\/p>\n\n\n\n
      function veritabaninaBaglan($host) {\n    if ($host !== 'localhost') {\n        throw new Exception(\"Gecersiz host adresi saglandi: \" . $host);\n    }\n    return \"Baglanti basarili.\";\n}\n\ntry {\n    $sonuc = veritabaninaBaglan('remote_server');\n    echo $sonuc;\n} catch (Exception $e) {\n    error_log($e->getMessage());\n    echo \"Sistemde bir aksaklik olustu. Hata kodu: \" . $e->getCode();\n}<\/code><\/pre>\n\n\n\n
      Yukar\u0131daki yap\u0131da:<\/p>\n\n\n\n
        \n
      • try blo\u011fu i\u00e7erisine hata olu\u015fturma ihtimali bulunan kodlar yaz\u0131l\u0131r.<\/li>\n\n
      • throw ifadesi ile \u00f6zel bir istisna f\u0131rlat\u0131l\u0131r.<\/li>\n\n
      • catch blo\u011fu, f\u0131rlat\u0131lan bu istisnay\u0131 yakalar. $e nesnesi \u00fczerinden getMessage(), getFile() ve getLine() gibi metotlarla hatan\u0131n nerede ve neden olu\u015ftu\u011fu bilgisine ula\u015f\u0131l\u0131r.<\/li>\n<\/ul>\n\n\n\n
        Profesyonel Ara\u00e7: Xdebug<\/h2>\n\n\n\n
        var_dump ve loglama y\u00f6ntemleri k\u00fc\u00e7\u00fck \u00f6l\u00e7ekli durumlarda yeterli olsa da karma\u015f\u0131k projelerde kod ak\u0131\u015f\u0131n\u0131 ad\u0131m ad\u0131m takip etmek i\u00e7in profesyonel bir araca ihtiya\u00e7 duyulur. PHP ekosistemindeki en g\u00fc\u00e7l\u00fc hata ay\u0131klama arac\u0131 Xdebug eklentisidir.<\/p>\n\n\n\n
        Xdebug, PHP \u00e7ekirde\u011fine bir eklenti olarak kurulur ve geli\u015ftiricinin kulland\u0131\u011f\u0131 edit\u00f6r (VS Code, PhpStorm vb.) ile ileti\u015fim kurar. Xdebug sayesinde:<\/p>\n\n\n\n
          \n
        • Kodun belirli sat\u0131rlar\u0131na durma noktalar\u0131 (breakpoint) konulabilir.<\/li>\n\n
        • Betik \u00e7al\u0131\u015f\u0131rken tam o noktada durur; t\u00fcm bellek durumu, tan\u0131ml\u0131 yerel ve global de\u011fi\u015fkenler incelenebilir.<\/li>\n\n
        • Kod sat\u0131r sat\u0131r ilerletilerek (step over, step into) mant\u0131ksal k\u0131r\u0131lmalar anl\u0131k olarak izlenebilir.<\/li>\n\n
        • \u00c7a\u011fr\u0131 y\u0131\u011f\u0131n\u0131 (call stack) g\u00f6r\u00fcnt\u00fclenerek hangi fonksiyonun hangi s\u0131rayla tetiklendi\u011fi net bi\u00e7imde g\u00f6r\u00fcl\u00fcr.<\/li>\n<\/ul>\n\n\n\n
          \u00dcretim Ortam\u0131nda Hata Ay\u0131klama G\u00fcvenli\u011fi<\/h2>\n\n\n\n
          Hata ay\u0131klama s\u00fcreci g\u00fcvenlik prensipleriyle do\u011frudan ba\u011flant\u0131l\u0131d\u0131r. Canl\u0131ya (production) al\u0131nm\u0131\u015f bir web uygulamas\u0131nda display_errors se\u00e7ene\u011finin kesinlikle kapal\u0131 (Off) tutulmas\u0131 gerekir.<\/p>\n\n\n\n
          Ekrana yans\u0131t\u0131lan ayr\u0131nt\u0131l\u0131 hata mesajlar\u0131; veritaban\u0131 kullan\u0131c\u0131 adlar\u0131n\u0131, sunucu dosya yollar\u0131n\u0131, tablo isimlerini veya sorgu yap\u0131lar\u0131n\u0131 d\u0131\u015f d\u00fcnyaya a\u00e7abilir. Bu durum, sald\u0131rganlar i\u00e7in bilgi toplama a\u015famas\u0131n\u0131 olduk\u00e7a kolayla\u015ft\u0131r\u0131r. \u00dcretim ortam\u0131nda yap\u0131lmas\u0131 gereken kural basittir: display_errors kapat\u0131lmal\u0131, log_errors a\u00e7\u0131lmal\u0131 ve olu\u015fan t\u00fcm problemler sunucu i\u00e7erisindeki korumal\u0131 log dosyalar\u0131ndan takip edilmelidir.<\/p>\n\n\n\n
          \u00d6zet ve Sonraki Ad\u0131mlar<\/h2>\n\n\n\n
          PHP’de etkili hata ay\u0131klama, kod kalitesini art\u0131ran ve geli\u015ftirme maliyetini d\u00fc\u015f\u00fcren temel bir yetenektir. Ba\u015flang\u0131\u00e7 seviyesinde error_reporting yap\u0131land\u0131rmas\u0131 ve var_dump kullan\u0131m\u0131 i\u015finizi g\u00f6r\u00fcrken, projeleriniz b\u00fcy\u00fcd\u00fck\u00e7e try-catch yap\u0131lar\u0131n\u0131 kurall\u0131 hale getirmeli ve Xdebug gibi interaktif ara\u00e7lar\u0131 \u00e7al\u0131\u015fma ortam\u0131n\u0131za entegre etmelisiniz. Bir sonraki ad\u0131m olarak yerel ortam\u0131n\u0131za Xdebug kurulumu yapabilir ve kulland\u0131\u011f\u0131n\u0131z kod edit\u00f6r\u00fc \u00fczerinde ilk breakpoint denemenizi ger\u00e7ekle\u015ftirebilirsiniz.<\/p>\n","protected":false},"excerpt":{"rendered":"
          PHP geli\u015ftirmede kar\u015f\u0131la\u015f\u0131lan hatalar\u0131 tespit etmek ve \u00e7\u00f6zmek i\u00e7in kullan\u0131labilecek temel ve ileri d\u00fczey hata ay\u0131klama y\u00f6ntemlerini \u00f6\u011frenin.<\/p>","protected":false},"author":1,"featured_media":10156,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[301],"tags":[303,314,213,315,266],"class_list":["post-10155","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-php","tag-backend","tag-hata-ayiklama","tag-php","tag-xdebug","tag-yazilim-gelistirme"],"yoast_head":"\nPHP'de Hata Ay\u0131klama Y\u00f6ntemleri - Yunus KAYTAN<\/title>\n<meta name=\"description\" content=\"PHP projelerinde hata ay\u0131klama y\u00f6ntemlerini ke\u015ffedin. 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