Ytukyg

This code...

 foreach ($classes->fieldMappings as $fieldMapping) {

        echo $fieldMapping['fieldName'];

 }

... is giving me the following output:

id

username

password

email

isActive

What I want to do now is, I want to put this code...

$entity->setUsername($data['form[username]']);

$entity->setEmail($data['form[email]']);

$entity->setPassword($data['form[password]']);

$entity->setIsActive($data['form[isActive]']);

...into a loop. So I replaced it like this:

foreach ($classes->fieldMappings as $fieldMapping) { 

   $entity->set'.$fieldMapping['fieldName'].'($data['form['.$fieldMapping['fieldName'].']']);

}

I get a Parse Error, but I actually don't know how to write this in the right way.

You can do it in one line, see the Complex (curly) syntax at PHP: Strings:

$entity->{'set'.$fieldMapping['fieldName']}($data['form['.$fieldMapping['fieldName'].']']);

However it might be more readable as:

$func = 'set'.$fieldMapping['fieldName'];

$args = $data['form['.$fieldMapping['fieldName'].']'];

$entity->$func($args);

Try to wrap your method name into curly braces, so making it like:

 $entity->{'set'.$fieldMapping['fieldName']}(...)