Answers for "laravel migration rename column and change type"

laravel migration change column name

Schema::table('users', function (Blueprint $table) {
    $table->renameColumn('from', 'to');
});

laravel migration update table column type

Schema::table('users', function ($table) {
    $table->string('name', 50)->change();
});
We could also modify a column to be nullable:

Schema::table('users', function ($table) {
    $table->string('name', 50)->nullable()->change();
});