php - Undefined index: when using session_start() in another browser or postman
one text
Solution:
firstly check session if it exists like
if( $_SESSION['Sort_Number']){
// our code here
}else{
//session did not have value
}
Sourceone text
firstly check session if it exists like
if( $_SESSION['Sort_Number']){
// our code here
}else{
//session did not have value
}
Source