Insert into PHP string of HTML elements

Question

I want to insert a checkbox to a HTML form which is stored in a PHP string variable $form:

$form = "
  <form action='/action_page.php'>
     First name:<br>
     <input type='text' value='Mickey'><br>
     Last name:<br>
     <input type='text' name='lastname' value='Mouse'><br>
     <input type='submit' value='Submit'>
  </form>";

$checkbox = "<input type='checkbox' name='agree' required> I agree!";

Context: Wordpress add_filter callback gets the form and should add the checkbox at the end of the form.

Thanks!

Girish · Accepted Answer · 2019-11-13 12:20:40Z

1

I think you want to insert the checkbox in form but before submit button. You can use this

$form = "
  <form action='/action_page.php'>
     First name:<br>
     <input type='text' value='Mickey'><br>
     Last name:<br>
     <input type='text' name='lastname' value='Mouse'><br>
     <input type='submit' value='Submit'>
  </form>";

$checkbox = "<input type='checkbox' name='agree' required> I agree!";
$form = str_replace("<input type='submit'", $checkbox."<input type='submit'", $form);

answered Nov 13, 2019 at 12:20

Girish

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tarcisiorosa · Accepted Answer · 2019-11-13 12:11:48Z

1

You can use a regular expression:

Don't forget to put the ending tag 'form' after variable $checkbox

preg_replace('/<\/form>/', $checkbox.'</form>', $form);

Probably should have better ways to do it, but I don't know wordpress architecture to sugest a better solution.

Link of preg_replace: https://www.php.net/manual/en/function.preg-replace.php

answered Nov 13, 2019 at 12:11

tarcisiorosa

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