January 2021
Intermediate to advanced
505 pages
9h 45m
Chinese
Content preview from PHP编程：第4版
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198
｜
第
8
章
Web
技术
<body>
<?php $fahrenheit = $_GET['fahrenheit']; ?>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="GET">
Fahrenheit temperature:
<input type="text" name="fahrenheit" value="<?php echo $fahrenheit; ?>" /><br />
<input type="submit" value="Convert to Celsius!" />
</form>
<?php if (!is_null($fahrenheit)) {
$celsius = ($fahrenheit - 32) * 5 / 9;
printf("%.2fF is %.2fC", $fahrenheit, $celsius);
} ?>
</body>
</html>
多值参数
用
select
标签创建的
HTML
选择列表允许有多个选项。要确保
PHP
能识别浏览器传递
的多值，你需要在
HTML
表单中使用中括号
[]
结尾，例如
：
<select name="languages[]">
<option name="c">C</option>
<option name="c++">C++</option>
<option name="php">PHP</option>
<option name="perl">Perl</option> ...
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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.