What is the scope of variable in PHP?
In PHP, variables can be declared anywhere in the script. The scope of a variable is the part of the script where the variable can be referenced/used.
Which is not scope of variable in PHP?
There are only two scopes available in PHP namely local and global scopes. When a variable is accessed outside its scope it will cause PHP error Undefined Variable.
How do you check if a variable is empty?
Determine whether a variable is considered to be empty. A variable is considered empty if it does not exist or if its value equals false . empty() does not generate a warning if the variable does not exist.
How do I check if a given variable is empty?
The empty() function checks whether a variable is empty or not. This function returns false if the variable exists and is not empty, otherwise it returns true. The following values evaluates to empty: 0.
What are 3 different variable scopes and briefly explain?
PHP has three types of variable scopes: Local variable. Global variable. Static variable.
How many variable scope are there in PHP Mcq?
How many variable scope are there in php? Explanation: Depending on the scopes, PHP has three variable scopes: Local, Global and static variable scope.
What are the 3 scope levels available in PHP?
What are the 3 scope levels available in PHP and how would you define them?
- Private – Visible only in its own class.
- Public – Visible to any other code accessing the class.
- Protected – Visible only to classes parent(s) and classes that extend the current class.
What is null in PHP?
Null is a special data type in PHP which can have only one value that is NULL. A variable of data type NULL is a variable that has no value assigned to it. Any variable can be empty by setting the value NULL to the variable. Syntax: $var === null.
How do you set a variable to NULL in PHP?
In PHP, a variable with no value is said to be of null data type. Such a variable has a value defined as NULL. A variable can be explicitly assigned NULL or its value been set to null by using unset() function.