动态地用$ _POST ['city']替换<input name =“city”type =“text”/>

Question

I've been two days searching how to do this. I have this form:

<form action="preview.php" method="post">
In the city of <input name="city" type="text" /> at <input name="days" type="text" /> days of <input name="month" type="text" /> gathered the following people: <input name="name1" type="text" /> and <input name="name2" type="text" /> with the objective of...

<button type="submit">Preview</button></form>

And preview.php should have this:

In the city of <?php echo $_POST['city'];?> at <?php echo $_POST['days'];?> days of <?php echo $_POST['month'];?> gathered the following people: <?php echo $_POST['name1'];?> and <?php echo $_POST['name2'];?> with the objective of...

The thing is the form is created via CMS so I have no way of knowing what the names of the inputs will be. Is there a way to dinamically replace, for example, <input name="city" type="text" /> with <?php echo $_POST['city'];?>? There are some thing I have in mind but since I'm new to PHP I don't know how to implement them.

Maybe preg_replace could do it but I don't know how to prevent the name of the input from changing. Or maybe I could use an array, for example <input name="data[]" type="text" /> and something like:

for($i=0;"";$i++){

if( isset( $_POST["data{$i}"] )) {

$string = $form;
$patterns = '<input name="data[]" type="text" />';
$replacement = $_POST["data{$i};
preg_replace($patterns, $replacements, $string);

}

}

I'm really lost here and I'd appreciate it if someone could help me with this.

PS: I'm not a native english speaker son I'm sorry if I made some mistake.

UPDATE: The user can make different forms in the CMS that will be saved in a database. Then he can choose which one he wants to fill. Once he fills it he can preview it and save it as a pdf. The preview.php will have the same text in the form but instead of the inputs it will have the value that the user entered.

Answer 1

(I have been a bit out of touch with PHP.)

Capture the HTML of the form with ob_ functions (output buffer).

if ($_SERVER['REQUEST_METHOD'] == 'POST' {

    ob_start();

    ... the CMS outputs HTML

    ob_end_flush();
    $s = ob_get_contents();

Use the name attribute to replace things

    function postText($matches) {
       return $_POST[$matches[1]];
    }

    $s = preg_replace_callback('/<[^>]* name="([^">]+)"[^>]*>/',
        "postText",
        $s);
    echo $s;

This uses a function for replacing a HTML tag with a name attribute.