Blade: check if old values are empty or not

You can do:

if(old('value', null) != null)

old('_token') === null

true - first request false - old request (after submit)

value="{{old('input') ? old('input') : ''}}"

WHY do you need this?

I ran into this same issue. In my case it was an array/multi select, for instance for user roles. If an admin wants to remove all roles but the form has another error, the form should be returned with an empty list of roles, instead of the old roles. Something like old('roles', $user->roles) does not work because old() just checks if the key exists in the session.

I solved it with the suggestion of @walidabou:

@php
    $old_roles = (old('_token') !== null) ? collect(old('roles')) : $user->roles;
@endphp
@foreach($roles as $role)
    <div class="form-check">
        <input type="checkbox" name="roles[]" value="{{ $role->id }}" @if($old_roles->contains($role->id)) checked @endif>
        <label>{{ $role->display_name }}</label>
    </div>
@endforeach

I ran into this issue on a dropdown, where a certain value is selected by default, but if validation fails, I want the selected value to remain.

<option value="5" {{ old('difficulty', null) === null ? 'selected' : ''}} {{ old('difficulty') === '5' ? 'selected' : '' }}>
	5 - Average
</option>