What is the output of `var_dump(null);` in PHP?

When you use var_dump(null); in PHP, the output indicates the type and value of the variable being examined. In this case, null represents a variable that has no value. The var_dump function is specifically designed to return information about one or more variables in a readable format, including their type.

Since null is a specific data type in PHP that signifies a variable with no assigned value, when var_dump is called with null, it outputs NULL. This output indicates both the type (which is NULL) and the value (which is absent, hence NULL).

The other options do not correspond to the output of var_dump(null);. FALSE and 0 are types in PHP that indicate different states (boolean false and integer zero, respectively), and an empty string ('') represents a string with no characters. None of these accurately convey the state of a variable assigned as null.