vendor/omnipay/common/src/Omnipay/Common/Helper.php

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<?php
/**
 * Helper class
 */

namespace Omnipay\Common;

use InvalidArgumentException;

/**
 * Helper class
 *
 * This class defines various static utility functions that are in use
 * throughout the Omnipay system.
 */
class Helper
{
    /**
     * Convert a string to camelCase. Strings already in camelCase will not be harmed.
     *
     * @param  string  $str The input string
     * @return string camelCased output string
     */
    public static function camelCase($str)
    {
        $str = self::convertToLowercase($str);
        return preg_replace_callback(
            '/_([a-z])/',
            function ($match) {
                return strtoupper($match[1]);
            },
            $str
        );
    }

    /**
     * Convert strings with underscores to be all lowercase before camelCase is preformed.
     *
     * @param  string $str The input string
     * @return string The output string
     */
    protected static function convertToLowercase($str)
    {
        $explodedStr = explode('_', $str);

        if (count($explodedStr) > 1) {
            foreach ($explodedStr as $value) {
                $lowercasedStr[] = strtolower($value);
            }
            $str = implode('_', $lowercasedStr);
        }

        return $str;
    }

    /**
     * Validate a card number according to the Luhn algorithm.
     *
     * @param  string  $number The card number to validate
     * @return boolean True if the supplied card number is valid