How does PHP handle '0' as a value in comparison to NULL or empty values, and what are the implications for variable assignment?

When comparing values in PHP, the loose comparison operator (==) considers '0' as equal to NULL or an empty value. This can lead to unexpected behavior when assigning variables. To avoid this issue, it is recommended to use the strict comparison operator (===) which checks both value and type. 

$value = '0';

if ($value === NULL || $value === '') {
    // handle NULL or empty value
} elseif ($value === '0') {
    // handle '0' value
} else {
    // handle other cases
}

Keywords

PHP comparison NULL empty values variable assignment

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