In PHP, what are the implications of comparing null values using "==" versus "===" and how does it impact type safety in code execution?

When comparing null values in PHP, using "==" checks for equality in value only, while "===" checks for both value and data type. This means that using "==" may lead to unexpected results if the data types are not considered. To ensure type safety in code execution, it is recommended to use "===" when comparing null values. 

// Incorrect comparison using ==
$var = null;
if ($var == 0) {
    echo "Equal";
} else {
    echo "Not equal";
}

// Correct comparison using ===
$var = null;
if ($var === 0) {
    echo "Equal";
} else {
    echo "Not equal";
}

Keywords

PHP null values comparison operators type safety code execution

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