How to count the number of non blank lines in php?

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$filename = "example.txt"; // replace with your file name or path

$nonBlankLineCount = 0; // initialize the counter

$file = fopen($filename, "r"); // open the file in read mode

if ($file) {
    while (($line = fgets($file)) !== false) { // read each line until end of file
        $line = trim($line); // remove leading and trailing whitespace
        
        if (!empty($line)) { // check if the line is not empty
            $nonBlankLineCount++; // increment the counter
        }
    }
    
    fclose($file); // close the file
} else {
    echo "Failed to open the file.";
}

echo "Number of non-blank lines: " . $nonBlankLineCount;