Prepare array [key => value] into sql query `key` = 'value'

prepareSqlQuery.php

/**
 * Convert $fields into column value SQL query
 *
 * @param $fields [columnName => value]
 * @return string
 */
function prepareQuery($fields)
{
  $result = '';

  foreach ($fields as $key=>$value)
  {
    $result .= "`$key` = '$value', ";
  }

  return empty($result) ? '' : substr($result, 0, -2);
}