اصلاح موقع بلغة PHP

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لدي موقع كامل مكتوب بلغة ال php ولكن برمجةالموقع قديمة جدا ولها حوالي 5 سنين والكود فيه اخطاء كثيرة وتسبب ثقل كبير على السيرفر فالموقع بحاجة الى اعادة تكويد الكود وصيانة كاملة قمت باستضافة الموقع ولكن شركة الاستضافة بعثت لي نصائح برسالة يجب ان اعملها بالموقع وهذا نص الرسالة... أتمنى قراءة الرسالة وفهم ما يحتاجه الموقع بالضبط (( - your scripts are not upgraded: you may have not upgraded your scripts yet, as older versions of the scripts can have bugs in them that would cause high CPU and Memory usage - your scripts are configured incorrectly: you might need to check your scripts configuration for any tweaks of settings available that might influence the usage, as a single wrong setting might do a whole lot of harm - your plugins are misbehaving: some plugins might cause high load because they were badly written. You might consider disabling them or finding alternatives for some plugins - bots are flooding your site: your pages might have been found by spam bots that try continuously to send messages via your contact form, or add various comments to your items and such, depending on your site's configuration. - you might need caching: a caching plugin will help in most cases as it will serve pre-generated html pages instead of using the resource intensive PHP scripts to generate the same page over and over again for different visitors of the site.))