Generating Add Column SQL from Array in php

mysql-add-col.php

<?php

$cols = [
  'col1',
  'col2',
  'col3',
  'col4',
  'col5',
  'col6',
  'col7',
  'col8',
  'col9',
  'col10',
];

$table = "example";

$after = "col0";
echo "ALTER TABLE `{$table}`".PHP_EOL;
foreach ($array as $col) {
        $line_end = end($array) == $col ? ';' : ',';
        echo "ADD COLUMN `{$col}` INT(6) NOT NULL DEFAULT 0 AFTER `{$after}`,".PHP_EOL;
        $last = $after;
}