PHP Data type: Data type in PHP

Data type
PHP has only integers, floating-point numbers (or real numbers, double numbers), and string three basic data types. Strings are available in single and double quotes, but have different meanings: only within double quotes you can use variables.
Variable
The variables are preceded by "$", and the variables do not need to be described (or defined) in advance by the type of the variable, and different types of data can assign values to the same variable. However, to use global variables, you need to specify (or add them to the $GLOBALS [] array). Use static variables to describe them.
Array
Using an array does not require a description of its type and size and can be used directly. The elements of the same array can have different data types.
Operator
The C language operator is largely preserved. Added string connector "." (use "->" when accessing object members). The "=>" operator is added to assign an initial value to an array. In addition, logic and ("&&") and Logic or ("") can also use "and" and "or" to increase the logical XOR or "XOR"
Basic statement
Requires mastery of if-else statements, switch-case statements, for statements, while statements, do-while statements, continue statements, and break statements. Require statements and include statements for inserting a disk file
Definition and use of functions
You do not need to specify function types and parameter types by using function definition functions.
Function name (parameter 1, parameter 2, ...). ）
{Statement 1;
Statement 2; .....
}
This article links http://www.cxybl.com/html/wlbc/Php/20130101/35451.html