PHP fgetcsv() - 查找列数

$filename = 'path/to/your/file.csv';
$file = fopen($filename, 'r');
$column_count = 0;

if ($file) {
    while (($line = fgetcsv($file)) !== FALSE) {
        $column_count = max($column_count, count($line));
    }
    fclose($file);
}

echo "The number of columns in the CSV file is: " . $column_count;