Laravel Custom Validation to check if the given value Exists as a Column in Table

Validation.php

<?php

// BELIEVE THIS ONLY WORKS WHEN USING MYSQL

// DROP THIS INTO GLOBAL.PHP

Validator::extend('columnexists', function($attribute, $value, $parameters)
{
    $query = DB::select("SHOW COLUMNS FROM " . $parameters[0]);
    $columns = array();
    foreach ($query as $column) {
        array_push($columns, $column->Field);
    }

    if(in_array($value, $columns)) return true;
    return false;
});

//IN YOUR RULES FOR YOUR VALIDATOR, USE AS FOLLOWS

$rules = array(
    'fieldNameToValidate' => 'columnexists:table_name_to_check'
);