What are the four major categories of PHP data types?

PHP data type classification

##1.Basic data types

1.1 Integer type

$a = 0123; // 八进制数(是以0开头) 83
$a = 0x1A; // 十六进制数              26

1.2 Decimal type (floating number) includes single precision and double precision

1.3 Boolean type (representing true and false)

1.4 String

2. Composite data type

2.1 Array

2.2 Object

3. Special data types

3.1null

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