What are best practices for handling strings in PHP functions, such as assigning, trimming, and passing them as parameters?

When handling strings in PHP functions, it is important to properly assign, trim, and pass them as parameters to avoid unexpected behavior or errors. To assign a string, simply use the assignment operator (=). To trim a string and remove any leading or trailing whitespace, use the trim() function. When passing strings as parameters to a function, make sure to properly define the parameter type in the function declaration.

// Assigning a string
$string = "   Hello, World!   ";

// Trimming the string
$trimmedString = trim($string);

// Passing the trimmed string as a parameter to a function
function myFunction(string $param) {
    // Function logic here
}

// Call the function with the trimmed string
myFunction($trimmedString);