Can I use Codeigniter for login and PHP for other functionality? -

my client has website built on php (without framework). website prone attacks 75% of work done. keeping scalability in mind want migrate codeigniter client wants mvp released in 30 days. can use partial codeigniter , continue existing php code. thank you.

you have not given lot of detail, here goes.....

firstly things might worth letting community know are:

• some coding examples exist in current project
• the type of application / web site being built
• what mean scalability (10s or 100s or millions of users)?

making assumptions here thoughts.....

time

if want task correctly first time no 30 days, if large application may take long test it, let alone (re)write it.

codeigniter

have used codeigniter before? suspect not if you're asking on here how easy or difficult might be. take @ least 1 project framework , start use correctly. should make dummy application framework before starting production work in it, first batch of code inside framework have issues.

scalability

the scalability issue null point, if new project going live scalability , performance should not issue unless have a) huge marketing budget , expecting lot of traffic or b) hosting on shared server , expecting perform well.

summary

i push through 75% have , fix security issues mention. writing rest of bespoke code , codeigniter cause more issues not know yet, these harder control, manage , fix. fix known security issues, these can manage, control , fix. codeigniter may open whole new can of bugs you.

ignore of above , this

be honest the client, tell them 30 days no no , irresponsible of launch in such rush. explain security issues , why starting again codeigniter using knowledge gained far produce far superior application / web site.