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In this article, the editor introduces in detail "how to define php global variables". The content is detailed, the steps are clear, and the details are handled properly. I hope this article "how to define php global variables" can help you solve your doubts.

In PHP, global variables are variables defined outside the function that can be referenced and changed anywhere, and the "global" keyword can be used to declare what is used when using global variables in the php function.

This article operating environment: Windows10 system, PHP7.1 version, Dell G3 computer.

What is the meaning of php global variable

Php variables can be roughly divided into global variables and local variables. The simple difference is that local variables are defined in the function and can only be used in the function. Global variables are defined outside the function and can be referenced and changed anywhere.

Definition method: global $variable

Explanation: $variable is the variable name, and global is the type of global variable

Example: define a global variable and output it in the function:

$variable= "hello baidu!" ; print_result (); function print_result () {global $variable;echo $variable;}

If the definition is successful, the final result will output hello baidu!

Definition and use of global for global variables

$name = "why"; function changeName () {$name = "what";} changeName (); echo "my name is". $name. ";? >

The result of executing the code is: my name is why, rather than displaying what after changeName (). To analyze the reason, this is because the $name variable in the function body changeName is set to a local variable by default, and the scope of $name is in changeName. So, modify the code to add the global variable as follows:

Global $name;$name = "why"; function changeName () {$name = "what";} changeName (); echo "my name is". $name. After reading this, the article "how to define php global variables" has been introduced. If you want to master the knowledge points of this article, you still need to practice and use it yourself. If you want to know more about related articles, welcome to follow the industry information channel.

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