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解答例

PHP

<?php
header("Content-type: text/html; charset=utf-8");

function testfunc(&$data2){
	echo "関数内で受け取ったdata2 → " . $data2 . "<br>";
	$data2 += 100;
	echo "関数内で処理後のdata2 → " . $data2 . "<br>";
	return $data2;
}

$data1 = 15;
echo "関数実行前のdata1 → " . $data1 . "<br>";

//ユーザ定義関数を呼び出し
echo "計算結果 → " . testfunc($data1) . "<br>";
echo "関数実行後のdata1 → " . $data1 . "<br>";

?>

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