PHP：操纵用户输入浏览器的数据

Question

I would like for a user to be able to input data in a text field on my website. WITH this data I would like for them to be able manipulate it.

For example:

Let's say someone needs all the letters in a paragraph capitalized and on my website I have a PHP script that does just that. How do I create a means for them to use my script?

Like so:

• paste paragraph into left text field
• press 'action button' or in this example 'capitalize letters' button
• text in left text field gets ran through the script and becomes all capitalized
• text now appears in right text field

A better way to ask this I guess is how do I connect the users input with the script and display the output once it's been ran?

Answer 1

You have to put your fields in a form in the HTML file, for example like this:

<form method="post" action="script_that_does_the_action.php">
    Left paragraph: <input type="text" id="leftP" name="leftP"><br>
    Right paragraph: <input type="text" id="rightP" name="rightP">
</form>

and then in your script that does all of the action, you can fetch the user input like this:

$userInput = $_POST['leftP'];
//do the capitalization now here
//store the result somehow. Maybe using sessions like this: $_SESSION["result"];
//then you have to redirect the page back to where the text fields are for example using header("location: ");

and now that you are back in the index page (if I may call it like that), paste the resulting value to the right field:

<input type="text" id="rightP" name="rightP" value="<?php echo $_SESSION["result"]; ?>">

Be sure that both of your files (the action script and index file) are in .php format, and that you start the session with session_start();

That's only one example...the most basic one. If you want to make it in the proper way, I'd also suggest using javascript :)