global statement

1, can local variables and global variable duplicate? A: Yes, the local will screen the overall situation. To use a global variable, you need to use the "::" Local variables can have the same name as global variables, and when referenced within a

1. Can a local variable be renamed with a global variable? A: Yes. Global blocking will be performed in some cases. To use global variables, you must use "::" A local variable can have the same name as a global variable. A local variable with the

1. Global & DynamicExample:slow_query_log? Display the value of the variable:Currently set to OFF? Set the variables of the global &dynamic type in a session:As you can see, a variable of type global must have its value set by the Global keyword. ?

One way to "make something happen" is to evaluate an expression with a side effect. Injected assignments and function calls these expressions with side-effects can be used as separate statements, and this expression is also called an expression

Static can be used in either of the following ways:Process-orientedProgramDesignStatic andObject-Oriented ProgrammingStatic. The former applies to common variables and functions, and does not involve classes. The latter mainly describes the role of

There are two ways to use static: process-orientedProgramStatic in design and static in object-oriented programming. The former applies to common variables andFunction, which does not involve classes. The latter mainly describes the role of static

Local variablesWhen you declare variables within a function definition, they are not related to other variables with the same name outside the function, that is, the variable name is local to the function. This is called the scope of the variable.

Differences between PHP global variables and Super global variables, and differences between php global variables. Differences between PHP global variables and Super global variables: differences between php global variables This article analyzes

Memory allocation of a program The memory consumed by a program compiled by C + + is divided into the following sections: 1, stack area (stack)-by the compiler automatically assigned to release, store the function of the parameter values, local

This article mainly introduces the PHP global variable and the Super global variable Difference, the detailed analysis tells the PHP global variable and the Super global variable concept, the usage and the use difference, the need friend can refer