Why does isset not consider null as a value in PHP?

In PHP, the isset function checks if a variable is set and is not null. Therefore, isset does not consider null as a value. To check if a variable is set and is not null, you can use the combination of isset and !is_null functions. 

// Check if a variable is set and is not null
if (isset($variable) && !is_null($variable)) {
    // Variable is set and is not null
    // Your code here
}

Keywords

isset null value PHP function

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