我们以一个提交订单和显示订单信息的例子为学习PHP的开始。这个例子包含两个文件。一个提交订单的html文件：orderform.html，一个显示订单信息的php文件：processorder.php。我将这两个文件放在test_1文件夹下，将test_1文件夹放在htdocs目录下。
文件的组织形式如下图所示，使用xampps安装的集成环境。
提交订单的html文件orderform.html如下所示：
<form action="processorder.php" method="post">
<table>
<tr bgcolor="#cccccc">
<td width="150">Item</td>
<td width="15">Quantity</td>
</tr>
<tr>
<td>Tires</td>
<td align="center"><input type="text" name="tireqty" size="3" maxlength="3" /></td>
</tr>
<tr>
<td>Oil</td>
<td align="center"><input type="text" name="oilqty" size="3" maxlength="3" /></td>
</tr>
<tr>
<td>Spark Plugs</td>
<td align="center"><input type="text" name="sparkqty" size="3" maxlength="3" /></td>
</tr>
<tr>
<td colspan="2" align="center"><input type="submit" value="Submit Order" /></td>
</tr>
</table>
</form>
显示订单信息的php文件processorder.php如下所示：
<?php
// create short variable names, also can use '$_REQUEST['name']'
$tireqty = $_POST['tireqty'];
$oilqty = $_POST['oilqty'];
$sparkqty = $_POST['sparkqty'];
?>
<!DOCTYPE html>
<html>
<head>
<title>Bob 's Auto Parts - Order Results</title>
</head>
<body>
<h1 id="Bob-s-Auto-Parts">Bob 's Auto Parts</h1>
<h2 id="Order-Results">Order Results</h2>
<?php
echo "<p>Order processed at ";
echo date('H:i, jS F Y')."</p>";
echo "<p>Your order is as follows: </p>";
echo "$tireqty tires<br />";
echo $oilqty.' bottles of oil<br />';
echo $sparkqty." spark plugs<br />"
?>
---------------------------------------------------<br />
<?php
$testHeredoc = <<< EOF
line 1
line 2
line 3
EOF;
echo "$testHeredoc"."<br />";
?>
---------------------------------------------------<br />
<?php
echo "About Comment:";
//Here is a comment.
#Here is a comment too.
/*
Here is multi line comment.
Here is multi line comment.
*/
?>
</body>
</html>
在浏览器中输入http://localhost/test_1/orderform.html，将显示填写订单信息页面，如下所示：
填入数字，然后点击“Submit Order”按钮提交内容。则页面将显示processorder.php经过PHP解析器解析之后生成的html页面，如下所示：
在这个例子中，我们可以学习到以下几点内容：
1. 在html中嵌入php代码的语法格式为： ，需要注意的是开始符号“
2. post方法提交的表单内容可以通过php的“$_POST[]”数组按照name获取，也可以通过“$_REQUEST[]”数组获取。这些数组为超级全局变量。
3. 字符串可以用单引号也可以使用双引号引起来， 也可以用反单引号引起来（反单引号在键盘最左上角，与~是一个键）。
三种引号作用不同：
- 单引号内的字符串将被当作纯文本原样输出；
- 双引号中如果有变量，则会替换成变量的值然后输出文本；
- 反单引号被叫做执行符，php解析器会先执行反单引号中的内容，将执行之后的结果返回。
4. 字符串可以使用点号“.”连接在一起。在php中点号是唯一的字符串连接符，相当于java中的“+”。
5. php中有三种注释方式：分别为类Java的单行注释“//”;类shell的单行注释“#”；类Java的多行注释“/**/”。
6.php中所有的变量使用时都是以“$”打头的， 并且变量使用时不需要提前声明。
而且变量的类型也可以随时改变，这取决于赋值给变量的值的类型。php变量的类型是在每一次赋值时确定和改变的。
第一个php例子就说到这里，希望大家继续关注小编为大家整理的文章。
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