What is the difference between null and 0 when counting empty lines in PHP?

When counting empty lines in PHP, it's important to distinguish between null and 0. Null represents the absence of a value, while 0 is a valid integer value. When checking for empty lines, it's best to use the strict comparison operator (===) to ensure that both the value and type are the same. This will prevent any confusion between null and 0 when counting empty lines. 

// Example code snippet to count empty lines in PHP
$lines = file('example.txt');
$emptyLines = 0;

foreach ($lines as $line) {
    if (trim($line) === '') {
        $emptyLines++;
    }
}

echo "Number of empty lines: " . $emptyLines;

Keywords

PHP null 0 empty lines counting

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