Function Returns Data by Value in PHP

Q

How Values Are Returned from Functions? in PHP?

✍: FYIcenter.com

A

If a value is returned from a function, it is returned by value, not by reference. That means that a copy of the value is return. Here is a PHP script on how values are returned from a function:

<?php
$favor = "vbulletin";
function getFavor() {
  global $favor;
  return $favor;
}
$myFavor = getFavor();
print("Favorite tool: $myFavor\n");
$favor = "phpbb";
print("Favorite tool: $myFavor\n");
?>

This script will print:

Favorite tool: vbulletin
Favorite tool: vbulletin

As you can see, changing the value in $favor does not affect $myFavor. This proves that the function returns a new copy of $favor.

⇒ Returning a Reference from a Function in PHP

⇐ Accessing Global Variables inside a Function in PHP

⇑ Creating Your Own Functions in PHP

⇑⇑ PHP Tutorials

2016-12-08, ∼2916🔥, 0💬

Reading and Writing Files in PHP
Where to find tutorials on how to Read and Write Files in PHP? A collection of tutorials to answer many frequently asked questions how to Read and Write Files in PHP. Topics included in this collection are: Reading a Text File to an Array in PHP Reading the Entire File to a String in PHP Opening a f... 2023-03-01, ∼3911🔥, 1💬

Defining an Array Argument as Reference in PHP
Can You Define an Array Argument as a Reference Type? in PHP? You can define an array argument as a reference type in the function definition. This will automatically convert the calling arguments into references. Here is a PHP script on how to define an array argument as a reference type: <?... 2016-12-18, ∼3836🔥, 0💬

Returning an Array from a Function in PHP
How To Return an Array from a Function? in PHP? You can return an array variable like a normal variable using the return statement. No special syntax needed. Here is a PHP script on how to return an array from a function: <?php function powerBall() { $array = array(rand(1,55), rand(1,55), ran... 2016-12-18, ∼3800🔥, 0💬

Specifying Argument Default Values in PHP
How To Specify Argument Default Values? in PHP? If you want to allow the caller to skip an argument when calling a function, you can define the argument with a default value when defining the function. Adding a default value to an argument can be done like this "function name($arg=expression){}. Her... 2016-12-04, ∼3012🔥, 0💬

Returning a Reference from a Function in PHP
How To Return a Reference from a Function? in PHP? To return a reference from a function, you need to: Add the reference operator "&" when defining the function. Add the reference operator "&" when invoking the function. Here is a PHP script on how to return a reference from a functi... 2016-12-08, ∼2976🔥, 0💬

Function Returns Data by Value in PHP
How Values Are Returned from Functions? in PHP? If a value is returned from a function, it is returned by value, not by reference. That means that a copy of the value is return. Here is a PHP script on how values are returned from a function: <?php $favor = "vbulletin"; function getFavor() { ... 2016-12-08, ∼2917🔥, 0💬

Local Variables in a Function in PHP
What Is the Scope of a Variable Defined in a Function? in PHP? The scope of a local variable defined in a function is limited with that function. Once the function is ended, its local variables are also removed. So you can not access any local variable outside its defining function. Here is a PHP sc... 2016-12-08, ∼2912🔥, 0💬

Function with Undefined Number of Arguments in PHP
How To Define a Function with Any Number of Arguments? in PHP? If you want to define a function with any number of arguments, you need to: Declare the function with no argument. Call func_num_args() in the function to get the number of the arguments. Call func_get_args() in the function to get all t... 2016-12-04, ∼2815🔥, 0💬

Global Variables in Main Script in PHP
What Is the Scope of a Variable Defined outside a Function? in PHP? A variable defined outside any functions in main script body is called global variable. However, a global variable is not really accessible globally any in the script. The scope of global variable is limited to all statements outsid... 2016-12-08, ∼2755🔥, 0💬

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.