A simple way to embed PHP in HTML_php tips-PHP Tutorial-php.cn

A simple way to embed PHP in HTML_php tips

WBOY

Release： 2016-05-16 19:58:26

Original

1312 people have browsed it

We start learning PHP with an example of submitting an order and displaying order information. This example contains two files. An html file for submitting orders: orderform.html, and a php file for displaying order information: processorder.php. I put these two files under the test_1 folder and the test_1 folder under the htdocs directory.
The file is organized as shown in the figure below, using the integrated environment installed by xampps.

The html file orderform.html for submitting the order is as follows:

<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>

Copy after login

The php file processorder.php that displays order information is as follows:

<&#63;php
// create short variable names, also can use '$_REQUEST['name']'
$tireqty = $_POST['tireqty'];
$oilqty = $_POST['oilqty'];
$sparkqty = $_POST['sparkqty'];
&#63;>

<!DOCTYPE html>
<html>
<head>
  <title>Bob 's Auto Parts - Order Results</title>
</head>
<body>
  <h1>Bob 's Auto Parts</h1>
  <h2>Order Results</h2>
  <&#63;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 />"
  &#63;>
  ---------------------------------------------------<br />
  <&#63;php
  $testHeredoc = <<< EOF
  line 1  
  line 2  
  line 3  
EOF;
  echo "$testHeredoc"."<br />";
  &#63;>
  ---------------------------------------------------<br />
  <&#63;php
  echo "About Comment:";
  //Here is a comment.
  #Here is a comment too.
  /*
  Here is multi line comment.
  Here is multi line comment.
   */
  &#63;>
</body>
</html>

Copy after login

Enter http://localhost/test_1/orderform.html in the browser, and the page for filling in the order information will be displayed, as shown below:

Fill in the number and click the "Submit Order" button to submit the content. The page will display the html page generated by processorder.php after being parsed by the PHP parser, as shown below:

In this example, we can learn the following points:

1. The syntax format for embedding PHP code in HTML is: . It should be noted that there cannot be a space between the start symbol "

2. The form content submitted by the post method can be obtained by name through the "$_POST[]" array of PHP, or through the "$_REQUEST[]" array. These arrays are super global variables.

3. Strings can be enclosed in single quotes or double quotes, or they can be enclosed in back-single quotes (the back-single quotes are in the upper left corner of the keyboard and are the same key as ~).

Three kinds of quotation marks have different functions:

The string within single quotes will be output as plain text;
If there is a variable in the double quotes, it will be replaced with the value of the variable and then the text will be output;
Anti-single quotes are called execution symbols. The PHP parser will first execute the content in the anti-single quotes and return the result after execution.

4. Strings can be connected together using the period "." The dot is the only string concatenation character in PHP, which is equivalent to " " in Java.

5. There are three comment methods in php: Java-like single-line comments "//"; shell-like single-line comments "#"; Java-like multi-line comments "/**/".

All variables in 6.php start with "$" when used, and variables do not need to be declared in advance when used.

And the type of a variable can also change at any time, depending on the type of value assigned to the variable. The type of a PHP variable is determined and changed with each assignment.
That’s it for the first PHP example. I hope you will continue to pay attention to the articles compiled by the editor.