How can the use of parentheses in PHP functions like echo affect the code execution?

Using parentheses in PHP functions like echo can affect the code execution by changing the way arguments are passed to the function. When using parentheses, the arguments are evaluated first before being passed to the function, which can lead to unexpected results or errors. To avoid this issue, always make sure to pass arguments to functions without parentheses.

// Incorrect usage of parentheses with echo
echo("Hello World");

// Correct usage without parentheses
echo "Hello World";