Php clean data without create_function and without eval

I am trying to create a class to clean data for a brand before adding it to my database.

As you can see I have added general filters (which can be used elsewhere). On the other hand, some fields will need a personalized cleaning. That's why I created 'function' in my array.

My code is currently functional however the create_function function is deprecated and I would like to remove it but I cannot find an alternative without using eval.

Can you help me find a solution? Thank you.

<?php
class VehMarques
{
    private static $fields_allowed = [
    
    '_id' =>    
    [
        'instanceof' => '\MongoDB\BSON\ObjectID',
    ],
                
    'name' => 
    [
        'function' => 'if(!isset($name) && !isset($age)){return false;}',
    ],
                
    'user' =>
    [
        'required',
        'instanceof' => '\MongoDB\BSON\ObjectID',
    ],
    
    'centre' =>
    [
        'required',
        'instanceof' => '\MongoDB\BSON\ObjectID',
    ],
    
    'time' =>
    [
        'instanceof' => 'MongoDB\BSON\UTCDateTime',
    ],
    
    ];
    
    public static function add(array $fields)
    {
        $fields_options=array();
        foreach(self::$fields_allowed as $key => $val)
        {
            foreach($val as $key1 => $val1)
            {
                if(in_array($val1, array('required')))
                {
                    $fields_options[$val1][$key] = null;
                }
                else
                {
                    $fields_options[$key1][$key] = $val1;
                }
            }
        }
        
        if(!empty(self::$fields_allowed) && !empty(array_diff_key($fields, self::$fields_allowed)))
        {
            return false;
        }
        
        if(!empty($fields_options['function']))
        {
            foreach($fields_options['function'] as $func)
            {
                $func = preg_replace('/\$([a-zA-Z0-9]+)/', '$fields[\'$1\']', $func);
                
                if(create_function('$fields', $func)($fields) === false)
                {
                    return false;
                }
            }
        }
        
        if(!empty($fields_options['required']) && !empty(array_diff_key($fields_options['required'], $fields)))
        {
            return false;
        }
        
        if(!empty($fields_options['instanceof']))
        {
            foreach($fields_options['instanceof'] as $key => $val)
            {
                if(!($fields[$key] instanceof $val))
                {
                    return false;
                }
            }
        }
        
        if(!isset($fields['_id']))
        {
            $fields['_id'] = new \MongoDB\BSON\ObjectID();
        }
        
        if(!isset($fields['time']))
        {
            $fields['time'] = new MongoDB\BSON\UTCDateTime();
        }
        
        return true;
    }
}

$insert_marque = array(
'_id' => new \MongoDB\BSON\ObjectID(),
'name' => 'Test',
'user' => new \MongoDB\BSON\ObjectID(),
'centre' => new \MongoDB\BSON\ObjectID(),
'time' => new MongoDB\BSON\UTCDateTime()
);

var_dump(VehMarques::add($insert_marque));
?>

Never use eval of function that can create executable code from string. It is extremely bad practice.

Use callbacks instead:

class VehMarquesValidator
{
    private $callbacks = [];
    
    public function __construct() 
    {
        $this->callbacks = [
            [$this, 'validateVehMarques']
        ];
    }

    public function validate(array $fields) 
    {
        foreach ($this->callbacks as $callback) {
            if (!call_user_func($callback, $fields)) {
                return false;
            }
        }

        return true;
    }

    private function validateVehMarques(array $fields) 
    {
        if(isset($fields['name'])) {
            return true;
        }
        
        if(isset($fields['age'])) {
            return true;
        }

        return false;
    }            
}

$validator = new VehMarquesValidator();
var_dump($validator->validate([
    'name' => 'Test'
]));

var_dump($validator->validate([
    'no_name' => 'Test'
]));

Try to avoid static methods. It is bad practice too.