What does the !== operator do in PHP comparisons, and when is it useful?

The !== operator in PHP is a strict comparison operator that checks if two values are not equal and of the same type. This means that not only the values need to be different, but also their data types must be different. This operator is useful when you want to ensure that both the value and the data type are different in a comparison. 

// Example usage of the !== operator
$value1 = 10;
$value2 = "10";

if ($value1 !== $value2) {
    echo "The values are not equal and of the same type.";
} else {
    echo "The values are either equal or of different types.";
}

Keywords

PHP !== operator comparisons type-safe useful

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