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]);
	$columns = [];
	foreach ($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 = [
	'fieldNameToValidate' => 'columnexists:table_name_to_check'
	];