PHP determines character type What are the PHP data types?

There are three major categories:

1. Basic data types:

Integer type (integer), which can be positive or negative integer decimal, octal, hexadecimal;

Floating point type (float),

String type ( string),

Boolean,

2. Composite data types:

array

object

3. Special data types:

null()

resource )

Note: 1>A variable is considered to be NULL in the following situations: NULL：

• 被赋值为 NULL
is assigned a value of NULL.
has not been assigned a value yet.

• is

  unset()
.

The above introduces PHP to determine the character type. What are the PHP data types? , including content on determining character types in PHP. I hope it will be helpful to friends who are interested in PHP tutorials.