Quick Answer: What does an uninitialized PHP Number evaluate to?

What is an uninitialized variable set to?

In computing, an uninitialized variable is a variable that is declared but is not set to a definite known value before it is used. It will have some value, but not a predictable one.

Is PHP case-sensitive?

In PHP, variable and constant names are case sensitive, while function names are not.

What are the rules for naming a PHP variable?

Rules for PHP variables:

A variable name must start with a letter or the underscore character. A variable name cannot start with a number. A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ ) Variable names are case-sensitive ($age and $AGE are two different variables)

What uninitialized means?

Uninitialized means the object has not been given a known value (through any means, including assignment). Therefore, an object that is not initialized but is then assigned a value is no longer uninitialized (because it has been given a known value).

Are ints initialized to 0 in C?

Variables declared (as int )at file scope are initialized to 0. In a small program, x was zero.

Why do we initialize variables to 0 in C?

In an array, if fewer elements are used than the specified size of the array, then the remaining elements will be set by default to 0. Let us see another example to illustrate this.

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What happens when a variable is uninitialized?

To create a variable without an initial value, simply don’t include an initial value: … The value in an uninitialized variable can be anything – it is unpredictable, and may be different every time the program is run. Reading the value of an uninitialized variable is undefined behaviour – which is always a bad idea.

What happens when you try to use an uninitialized local variable?

Local variables are slightly different; the compiler never assigns a default value to an uninitialized local variable. Accessing an uninitialized local variable will result in a compile-time error.

Are PHP namespaces case sensitive?

Note: Namespace names are case-insensitive. Note: The Namespace name PHP , and compound names starting with this name (like PHPClasses ) are reserved for internal language use and should not be used in the userspace code.

What is PHP call function?

A PHP function provides code that a PHP script can call to perform a task, such as Count(), file_get_contents(), and header(). The PHP language supports both procedural and object-oriented programming paradigms.

How do you define a constant in PHP?

A constant name starts with a letter or underscore, followed by any number of letters, numbers, or underscores. If you have defined a constant, it can never be changed or undefined. To define a constant you have to use define() function and to retrieve the value of a constant, you have to simply specifying its name.

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