search_csv.php

<?php

// Search CSV
$csv = './Debitorer.csv';
$result = [];
$i = 0;
if (($handle = fopen($csv, "r")) !== false) {
    
    while (($data = fgetcsv($handle, 1000, ";")) !== false) {
		$i++;
      
    // Column to search is 0 value to search for is ''
		if ($data[0] == '') {
            echo $i . "\n";
            var_dump($data);
        }
    }
    fclose($handle);
}