March 2017
Intermediate to advanced
364 pages
9h 45m
Japanese
Content preview from 初めてのPHP
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
5.2
関数へ引数を渡す
79
page_header();
print "Welcome, $user";
page_footer();
function page_footer() {
print '<hr>Thanks for visiting.';
print '</body></html>';
}
5.2
関数へ引数を渡す
いつでも同じことを実行する関数もあれば（前節の
page_header()
など）、変更可能な入力を操作
する関数もあります。関数に渡される入力値は引数（argument）と呼ばれます。引数は関数の柔軟
性を高めるため、関数の威力が大きくなります。前節の
page_header()
を修正し、ページカラーを
保持する引数を取るようにしてみましょう。修正した関数宣言を例5-4 に示します。
例
5-4
引数を取る関数の宣言
function page_header2($color) {
print '<htm
l><head><title>Welcome to my site</title></head>';
print '<body bgcolor="#' . $color . '">';
}
関数宣言で関数名の後の括弧の間に
$color
を加えます。これで関数内で
$color
という変数を使
用できます。この変数は、呼び出し時に関数に渡された値を保持します。例えば、以下のように関
数を呼び出すことができます。
page_header2('cc00cc');
すると、
page_header2()
の中で ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.