Send and get Query String
PHP, like CGI, ASP, and JSP, can send and retrieve data by using a form
or a link. For example, if you have a form that has an input field such
as this:
<INPUT TYPE=TEXT NAME="userName">
Given you enter a value "John" and submit it. Then the variable
"userName" has a value of "John".
Then you can access it in the same page or in the next page:
echo "Hi " . $_POST['userName'];
If you use a link like:
<a href="nextpage.php?userName=John">John</a>
Then you can retrieve the value:
echo "Hi " . $_GET['userName'];
There are some functions for passing message. For example, if you transform
a message that contains HTML code and you want to keep the HTML code not
interpreted, you can use the htmlentities() function:
$message = htmlentities($message);
The below are some useful functions
| name |
description |
| htmlentities |
transforms special characters of a string into HTML entities |
| parse_str |
retrieves and creates all variables passed in an URL |
| split |
splits a string into an array according to a separator string |
| date |
formats a date |
|
