Explain the difference between $message and $$message.

The main difference between the $message and $$message is given below: $message $$message $message is a regular variable. $$message is a reference variable. It has a fixed name and stores a fixed value. It stores data about the variable. Data stored in $message is fixed. The value of the $$message can change dynamically as the … Read more

Differentiate between variables and constants in PHP

Few difference between variables and constants in PHP are given below Variables Constants The value of a variable can be changed during the execution. The constant value can’t be changed during script execution. Variables require compulsory usage of the $ sign at the start. No dollar sign ($) is required before using a constant. It … Read more