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You can use a OR statement to check multiple conditions:
<input id="login" type="text" class="form-control {{ (@error->has('phone') || @error->has('email') || @error->has('name')) ? 'is-invalid' : '' }}" name="email" value="{{ old('phone') ?: old('email') ?: old('name') }}" required autofocus>
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solved How to Login with username, email, phone number