About PHP variable declaration and storage method in memory

php variable declaration and storage method in memory

①Introduction to php variables

Description: The space that can store the changing amount (data), the changing amount is determined by the context . So it is called a weakly typed language.

　②Memory area

Stack area Heap area Function area...

PHP automatically releases variables in memory

　③Declaration of variables

　Note: PHP variables are defined and declared by $. Variables need to be defined and declared in memory.

Syntax: $variable name = quantity

Note: The variable name is composed of numbers (0-9), letters (a-Z), and underscores, and cannot start with a number. A good variable name should make it clear what the name means.

Eg:

//变量的申明
　　$name = ‘张三’;
　　$age = 18;
　　$sex = true;

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