PHP describes numerous data types to be used. Those are listed below:

List of PHP data types 
DATA TYPE DESCRIPTION
the array type Used to store multiple values (any data type) as a single variable.
the Boolean type Used to store 0 or 1 (TRUE or FALSE).
the floating-point type Used for storing floats (rational number with decimal point).
the integer type Used for storing integers (rational number without decimal point).
the NULL type Used to define a data type (a variable) that has no assigned value to it.
the object type Used to store other data, functions or any information of an object.
the string type Used to store string characters (contained within quotes).