After Moving Host Script Not Working

Hi Everyone , thanks for helping me
i have problem with my website , recently i moved my site from old host (Cpanel) MySQL 5.6 and PHP5.3 to New Cpanel (Updated to latest version) with MariaDB 10.3 and PHP5.6 , so i face with one problem , (both host active now)
1. to old host when type URL P.example.com/system automatic redirect to P.example.com/system/login.php, but in new host with URL P2.example.com , can't do that , when type P2.example.com/system open blank page with nothing , i must type directly P2.example.com/system/login.php, also when login instead redirect to P2.example.com/index.php redirect to P2.example.com/system/ and when type manually P2.example.com/system/index.php script not work and show blank page , i can't find solution why this happened , please anyone help me what't the problem
2. in old host when open P.example.com all functions work and show website name and can login via user , but in P2.example.com don't show website name , all functions not work and can't login with valid username and password
3. for more information you can see info.php for both website OLD(This script work properly right now): P.example.com/info.php and New (This script not work): P2.example.com/info.php, Please anyone if can help me , i want delete old host but i can't use in new host , i wish someone help me , thanks

 

i don't check .htaccess on old host , but i checked this script on new host with PHP5.3 but not working , so i decided test with PHP5.6 and either not work too , Old host based on PHP5.3 , can you help me please , maybe security reason don't allow work on my host , i don't know , please help me

 

This is my own host , based on VPS , right now with EA4 and PHP5.4 tested and not working , i don't know why , when i set PHP5.4 open blank page and when set back to PHP5.6 Open Script but can't login , (

 

he not answer at all , and i need this script badly , before just tell me i don't know work with which PHP version , so i read everywhere , post everywhere ask help everywhere , because i'm confused , developer of this script just tell the problem on your host not me and never answer me anymore , i test this script with hostgator.com , justhost.com , own host and over 10 other hosting , every host same problem , please help me , i just can't solve this puzzle , with comparison of infor.php for old host and new host can find something?
i read every line but can't figure out , please please help me

 

a ticket already open with cPanel tickets ID# 8988745 , but agents can't help me , because this is not related to cpanel , please you help me , please Michael

 

Thank you , but i checked with cloudlinux and PHP5.3 not working at all , if i install new host on my server with cloudlinux can you set for me?

maybe cause problem because in new server i installed Centos 7 and old server is Centos 6?

 

before one week ago i tested with one server already have cloudlinux and php5.3 , tested not work , those server totally delete , i want now install new server and install cloudlinux , if it's work so good , after install new server and face with problem can you help me?