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A function is a fragment of code that can be executed multiple times anywhere in the script as needed. In PHP, there are built-in functions, but sometimes they are not enough for creating websites, and then there is the option to create a custom function. User-defined functions are those created by the user. The syntax of a user-defined function is as follows: Rules for writing functions: The function name must start with a letter or an underscore. Any valid PHP code can be used in the body of the function, including other functions. A previously written function cannot be overwritten. Let's write the simplest greeting function. <?php function greet () { echo 'Hello everyone'; } greet (); ?> In the browser, we will see the text that we wrote in the body of the function, i.e., the phrase 'Hello everyone'. This function can be called multiple times anywhere in the script. If you noticed, this function was without parameters. Let's write a simple function with parameters. <?php
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