How to use switch case statement in PHP. Find the ASCII value in python at W3Codeworld:

Switch Case is a very important option in the field of Programming languages. We couldn’t leave Switch Case Statement if we talk about the programming languages now a day.

You know that PHP Switch Statement gives a unique way to get about PHP Switch Case Statement & PHP double question mark which replace several if statements, it is great choices out of the various options, which gives a coding terminology in the form of block condition with easy logical terminology.

Introduction of PHP Switch Statement:

Switch Case Statement facilitates testing of the variables by the switch case statement against a series of values. It is an alternative of else if statements which give permission to get tested for equality against a list of values. Each value is called a case and the variable switched on is checked for every switch case.

Rules of the Switch Case:

Ø  The default case is optional.

Ø  All case expressions must be unique.

Ø  The case statements should be including only constants, not a variable, expression.

Ø  The data type of the variable and the case expression must match.

Ø  There can be any number of case statements within a switch.

 

What is PHP with double Question Mark?

The double Question Mark Operator is known as the Null Coalescing operator, which was added in PHP 7. Null Coalescing works in the chain format, i.e. one after the other following logic.

 

Types of Errors in PHP: An error is a type of mistake made or caused by putting incorrect code, syntax or wrong logic. It should be careful about by the developer& giving the right coding during PHP working. Basically, there are 4 types of errors:

·       Syntax Error: It is also called a parse error. A syntax error is a mistake made by the Programmer in the source code of the program. It arises during making common mistakes in code like missing semicolon, missing parenthesis, unclosed brackets, unclose quotes, etc.

·       Fatal Error: When the compiler compiles the code but do not understand the undeclared function, then this type of error is known as Fatal Error.

·       Warning Error& Notice Errors: It approx. both same, when program contains something wrong in the coding work then it indicates warning error and give notice error occurrence but allows the execution of the script.

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