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/*Depending of type the relationship, Eloquent
will return a Collection, a Model or Null.
And in Php 7.1 count(null) will throw an error*/
$onerow = mytableModel::where('colname', $var1)
->where('col_name', $var2)
->first();
if($onerow != null){
$myCol = $onerow->my_table_col_name;
}
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// return first row by id
$user = App\User::where('id',$id)->first();
// or return directly a field
$userId = App\User::where( )->pluck('id');
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$user = User::where('mobile', Input::get('mobile'))->get();
if (!$user->isEmpty()){
$firstUser = $user->first()
}