What potential issue arises from defining a function within an if statement in PHP?

Defining a function within an if statement in PHP can lead to unexpected behavior or errors because functions should ideally be defined outside of conditional blocks. To solve this issue, define the function outside of the if statement to ensure it is always available for use.

// Define the function outside of the if statement
function myFunction() {
    // Function code here
}

if ($condition) {
    // Call the function
    myFunction();
}