PHP judgment Variable Type common method _php skill

Now let's take a look at how to use the specific

GetType ()
GetType returns the following values based on the parameter type
"Boolean" (from PHP 4)
"Integer"
Double (returns "double" instead of "float" if float)
"String"
"Array"
"Object"
"Resource" (from PHP 4)
"NULL" (from PHP 4)
"Unknown type"

For example:
GetType (' 1 '); Returns a string
and GetType (1); Returns an integer


Is_array ()
Is_array () is relatively simple to use
Returns False if the argument is an array return true

The usage and return values of several other functions are similar to Is_array ()
The note here is that is_numeric () is used to determine whether a variable is a number or a number of strings.
Returns true if the parameter of Is_numeric () is a numeric or numeric string, or False