PHP parameterized functions are functions with parameters. You can pass any number of parameters inside a function. These given parameters act as variables inside your function. They are specified inside the parentheses, after the function name. Output depends upon dynamic values passed as parameters into the function.
Parameterized functions in PHP refer to functions that accept parameters or arguments. These parameters allow you to pass data into the function when it is called, enabling the function to perform operations on that data.
Here’s how parameterized functions work in PHP:
- Definition: When you define a function in PHP, you can specify parameters inside the parentheses following the function name. For example:
function greet($name) {
echo "Hello, $name!";
}
In this example, $name is a parameter of the greet function.
- Invocation: When you call a function, you can pass values (arguments) for its parameters. These values will be used within the function’s body. For example:
greet("John");
In this call, "John" is passed as an argument to the greet function, and it will be substituted for the $name parameter inside the function.
- Multiple Parameters: Functions can have multiple parameters separated by commas:
function add($a, $b) {
return $a + $b;
}
You can then call this function with two arguments:
$result = add(3, 5); // $result will be 8
- Default Parameters: PHP also supports default parameter values. These are values that are used if no argument is provided for that parameter during the function call. For example:
function greet($name = "World") {
echo "Hello, $name!";
}
If you call greet() without an argument, it will use the default value:
greet(); // Output: Hello, World!
But you can still override the default value by passing an argument:
greet("Alice"); // Output: Hello, Alice!
Parameterized functions in PHP provide flexibility and reusability in your code by allowing you to create generic functions that can operate on different sets of data based on the parameters passed to them.