Functions In PHP

  • A block of code for specific tasks.
  • Save compile time –only compile once.
  • Reuse many times when needed.
  • Optimize your code.

Built-in functions like print(); date();

  • User-defined functions:
  • Function names cannot have spaces.
  • Function name must begin with letter or underscore.

E.g., call a built-in function abs();

Declaring a Function

  • You can declare a function below a call to it.
  • May have none, one, or multiple arguments each separated by a comma.
  • Write function name followed by ( ), even if the function doesn’t have any arguments.


Functions – Return Value

  • Functions may have a return value.
  • A return value in a function, returns the value to the function that may be used later on while calling a function.
  • You may need to access the value that the function returns, but you may not need to print it out, that’s why you use a return value for a function.

Example-Functions – Return Value

Example-Functions – Without Return Value

PHP built-in Functions

Sqrt(); — Take the square root of a number

Ceil(); — Take ceil of a decimal number

Floor(); — take the floor of a decimal number

Max(); — take the max number

Min(); — take the min number

Strtolower(); — convert string to lower case

Strtoupper(); — convert string to upper case

About the author

Anuj kumar

I'm Anuj kumar a web developer with 4+ year experience .I write blogs in my free time. I love to learn new technologies and share with others. I founded PHPGurukul in September 2015. The main aim of this website to is provide php , jquery , mysql , phpoops and other web development tutorials. I am trying best effort to make PHPGurukul useful for every single moment spend on this website. If you think this website is useful to visit please share with your friend and buddies.

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