What is the significance of using XOR in the context of checking for a null callback function in PHP?

When checking for a null callback function in PHP, using XOR is significant because it allows us to determine if either one or both of the callback function variables are null. This is useful when we want to ensure that at least one of the callback functions is not null before proceeding with the operation. 

// Check if either callback function is null using XOR
if ($callbackFunction1 xor $callbackFunction2) {
    // At least one callback function is not null, proceed with operation
    // Your code here
} else {
    // Both callback functions are null, handle error
    echo "Error: At least one callback function must be provided.";
}

Keywords

PHP XOR null callback function significance checking

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