PHP 引数

 <?php

function showAd($message = 'Ad') //仮引数

{

  echo '----------' . PHP_EOL;

  echo '--- ' . $message . ' ---' . PHP_EOL;

  echo '----------' . PHP_EOL;

}

showAd('Header Ad'); //実引数

echo 'Tom is great!' . PHP_EOL;

echo 'Bob is great!' . PHP_EOL;

// showAd('Ad');

showAd();

echo 'Steve is great!' . PHP_EOL;

echo 'Bob is great!' . PHP_EOL;

showAd('Footer Ad');