What resources or documentation should be consulted to avoid relying on trial and error for PHP coding challenges?

To avoid relying on trial and error for PHP coding challenges, developers should consult official PHP documentation, online forums such as Stack Overflow, PHP programming books, and tutorials from reputable sources. By referencing these resources, developers can gain a better understanding of PHP concepts, best practices, and common pitfalls, ultimately improving their coding efficiency and accuracy.

// Example code snippet demonstrating how to consult PHP documentation for array functions
$array = [1, 2, 3, 4, 5];
$sum = array_sum($array);
echo $sum;