▁over view ▁ ▁F uel PHP ▁is ▁written ▁in ▁PHP ▁ 5 . 3 . ▁and ▁requires ▁at ▁least ▁ 5 . 3 . 3 ▁for ▁V 1 . x . ▁ ▁C asc ading ▁File ▁System ▁( in sp ired ▁by ▁Koh ana ▁framework ): ▁a ▁directory ▁structure ▁partially ▁based ▁on ▁names paces ▁used ▁by ▁classes . ▁ ▁F lex ibility : ▁almost ▁every ▁component ▁of ▁the ▁core ▁framework ▁can ▁be ▁extended ▁or ▁replaced . ▁ ▁Mod ular ity : ▁applications ▁can ▁be ▁divided ▁up ▁into ▁modules . ▁ ▁Ext ens ibility : ▁additional ▁functional ities ▁can ▁be ▁added ▁to ▁the ▁framework ▁through ▁packages . ▁ ▁Fe atures ▁over view ▁ ▁A ▁URL ▁routing ▁system . ▁ ▁REST ful ▁implementation . ▁ ▁H M VC ▁implementation . ▁ ▁Template ▁parsing : ▁St ags ▁( a ▁specific ▁F uel PHP ▁template ▁engine ) ▁and ▁Must ache ▁template ▁engines ▁are ▁included ; ▁drivers ▁for ▁Mark down , ▁Sm art y , ▁Tw ig , ▁Ham l , ▁J ade ▁and ▁D wo o ▁template ▁engines . ▁ ▁Form ▁and ▁data ▁validation ▁features . ▁ ▁An ▁Object ▁Rel ational ▁M apper ▁( ORM ). ▁ ▁V ul ner ability ▁prote ctions : ▁the ▁framework ▁enc odes ▁output , ▁provides ▁C SR F ▁protection , ▁cross - site ▁script ing ▁protection , ▁input ▁filtering ▁features , ▁and ▁prevents ▁SQL ▁injection . ▁▁ ▁The ▁Auth ▁package ▁provides ▁a ▁set ▁of ▁components ▁with ▁which ▁authentication ▁and ▁authorization ▁application ▁functional ities ▁can ▁be ▁built . ▁S entry ▁is ▁another