Are there any specific best practices for using the += operator in PHP?

When using the += operator in PHP, it is important to ensure that the variable on the left-hand side of the operator is already defined and initialized. If the variable is not initialized, using the += operator will result in an error. To avoid this issue, always initialize the variable before using the += operator.

// Initializing the variable before using the += operator
$sum = 0;
$sum += 5; // $sum is now 5