Definition and use of constant...

Constants need to be assigned values ​​when they are defined, and the values ​​cannot be modified du...

Some differences between using...

As we all know, in PHP (php 4 and later), we can use the function define() to define constants. Howe...

How to declare constants in ph...

Constants can be understood as quantities whose values ​​do not change. Once a constant is defined, ...

what are variables from outsid...

HTML Forms (GET and POST) When a form is submitted to a PHP script, the information in the form is a...

What is the difference between...

Let me explain it to you from the perspective of the PHP kernel. You can understand it completely if...

A brief discussion on the secu...

Variable variables are a very convenient feature of PHP. As mentioned in the manual, variable variab...

Detailed explanation of how to...

Sometimes variable variable names bring great convenience to programming. That is to say, variable n...

What is the use of mutable var...

What is a mutable variable? PHP provides another type of variable - mutable variables. Mutable varia...

Detailed explanation of variab...

A variable variable is a variable whose name can be dynamically set and used. The syntax form is a s...

What are mutable variables in ...

A mutable variable is a unique variable in PHP that allows the name of a variable to be changed dyna...