What is php variable scope

php editor Yuzai will answer the question of php variable scope for you. PHP variable scope refers to the effective scope of the variable in the program, including global scope, local scope and static scope. Variables in the global scope can be accessed throughout the program, variables in the local scope can only be accessed within the code block in which they are defined, and variables in the static scope retain their values ​​after the function call. Understanding variable scope helps you better understand and use the PHP programming language.

1. Local Scope: refers to a variable defined inside a function or code block and can only be accessed within that function or code block. Local variables will be destroyed after the function or code block is executed.

2. Global Scope: refers to variables defined outside the function and can be accessed anywhere in the entire program. Global variables need to be accessed inside the function using the global keyword.

3. Static Scope: refers to the variable defined inside the function and will not be destroyed after the function is executed. Static variables retain their previous value each time the function is executed.

4. Super Global Scope: refers to predefined global variables that can be accessed anywhere. Superglobal variables are available throughout the entire program, such as $_POST, $_GET, $_SESS<strong class="keylink">io</strong>N, etc.

The above is the detailed content of What is php variable scope. For more information, please follow other related articles on the PHP Chinese website!