Laravel Extended Validation custom message

Question

I wanted to create this extended validation.

Validator::extend(\'my_custom_validation_rule\', function ($attribute, $value, $parameters) {
   // I guess I s         


        

Answer 1

This is basically the same way as @lukasgeiter answer, but in case you need to manage dynamic variable inside the extend function, you can use $validator->addReplacer inside the extend directly.

Validator::extend('my_custom_validation_rule', function ($attribute, $value, $parameters, $validator) {

    // Test custom message
    $customMessage = request()->get('foo') 
        ? "Foo doesn't exist"
        : "Foo exist";

    // Replace dynamic variable :custom_message with $customMessage
    $validator->addReplacer('my_custom_validation_rule', 
        function($message, $attribute, $rule, $parameters) use ($customMessage) {
            return \str_replace(':custom_message', $customMessage, $message);
        }
    );

    // Test error message. (Make it always fail the validator)
    return false;

}, 'My custom validation rule message. :custom_message');