Change Input Value Stored in String using PHP

Question

I have a form that allows a user to paste the code for an HTML form into a textarea. I then store the form they pasted in a string.

Before I echo that form back into my page template I want to change the value of the submit button.

Currently I am using jQuery to do this, but I would like to do it server side first.

Here is my jQuery Code:

    $("input[type='submit']").attr("value","my new value");

How would I search the string for that value using PHP and switch it out before the form is printed?

UPDATE: To clarify, I am trying to search a string for:

<input type="submit" value="old value" />

and replace it with

<input type="submit" value="new value" />

the string has a whole form inside it like this:

$string = '<form>
<input type="text" value="any">
<input type="submit" value="old value">
</form>';

Mihai Iorga · Accepted Answer · 2012-09-20 06:36:25Z

1

You can do that with DOMDocument:

$dom = new DOMDocument;
$dom->loadHTML($form);
$xpath = new DOMXPath($dom);
$input = $xpath->query('//form/input[@type="submit"]')->item(0)->attributes;

foreach($input as $item){
    if($item->name == 'value'){
        $item->value = 'New Value';
    }
}

echo $dom->saveHTML();

answered Sep 20, 2012 at 6:36

Mihai Iorga

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1 Comment

ExodusCheese Over a year ago

That works perfect! Thanks for the detailed description it was very easy to follow.

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