Common methods for determining variable types in php

Common php variable judgment functions include gettype (), is_array (), is_bool (), is_float (), is_integer (), is_null (), is_numeric (), is_object (), is_resource (), is_scalar (), and is_string (). now let's take a look at the specific usage.

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

For example:
Gettype ('1'); returns string
Gettype (1); returns integer


Is_array ()
Is_array () is relatively simple to use
Returns true if the parameter is an array; otherwise, returns false.

The usage and return values of other functions are similar to those of is_array ().
Here, we need to note that is_numeric () is used to determine whether the variable is a number or a number string.
Returns true if the is_numeric () parameter is a numeric or numeric string. otherwise, returns false.