Error when generating a Smarty template from a string [closed] - php

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I use the Smarty template engine to create a message for each record in an array. The code sets a template message in the variable $template, which contains placeholders (e.g. {$user_id}) that will be replaced by actual values.
The actual values are stored in an array $variables, where each key of the array corresponds to a placeholder in the template. For example, 'user_id' => $array['USERID'] means that the placeholder {$user_id} in the template will be replaced by the value of $array['USERID'].
The code then creates an instance of the Smarty class and uses a foreach loop to iterate through the $variables array. For each iteration, it checks if the current key of the array exists as a placeholder in the template, and if so, it assigns the corresponding value to that key in the Smarty instance.
Finally, the code calls the fetch method of the Smarty instance with the template message passed as a string, which generates the final message and stores it in the $output variable.
All works ok regarding the process until i need to generate the template. I get a 500 error. When getting the values assigned to smarty, everything is fine though. What can cause this error?
foreach ($record as $array){
$template="<p>this is the template<br />
dear {$user_id}<br />
I hope you are well, {$first_name}, congrats you were previously {$current_level} and you are now becoming {$adjusted_level}.<br />
Therefore you are {$variation} !<br />
Best regards<br />
The management</p>";
$variables = array(
'id' => $array['id'],
'user_id' => $array['USERID'],
'first_name' => $array['FIRST_NAME'],
'current_level' => $array['Current_Level'],
'adjusted_level' => $array['Adjusted_Level'],
'current_weight' => $array['Current_weight'],
'adjusted_weight' => $array['Adjusted_weight'],
'variation' => $array['Variation']
);
$smarty = new Smarty();
foreach ($variables as $key => $value) {
if (strpos($template, '{$' . $key . '}') !== false) {
$smarty->assign($key, $value);}
}
$output = $smarty->fetch('string:'.$template);
}