Migration étrangère de Laravel
$table->unsignedBigInteger('user_id');
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
Imran Developer
$table->unsignedBigInteger('user_id');
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');// for laravel 7 or above.
$table->foreignId('user_id')->constrained();
/*-----------OR---------------*/
$table->foreignId('user_id')->constrained('users');