Helper.php

<?php
 
if (!function_exists('human_file_size')) {
    /**
     * Returns a human readable file size
     *
     * @param integer $bytes
     * Bytes contains the size of the bytes to convert
     *
     * @param integer $decimals
     * Number of decimal places to be returned
     *
     * @return string a string in human readable format
     *
     * */
    function human_file_size($bytes, $decimals = 2)
    {
        $sz = 'BKMGTPE';
        $factor = (int)floor((strlen($bytes) - 1) / 3);
        return sprintf("%.{$decimals}f", $bytes / pow(1024, $factor)) . $sz[$factor];
 
    }
}
 
if (!function_exists('in_arrayi')) {
 
    /**
     * Checks if a value exists in an array in a case-insensitive manner
     *
     * @param mixed $needle
     * The searched value
     *
     * @param $haystack
     * The array
     *
     * @param bool $strict [optional]
     * If set to true type of needle will also be matched
     *
     * @return bool true if needle is found in the array,
     * false otherwise
     */
    function in_arrayi($needle, $haystack, $strict = false)
    {
        return in_array(strtolower($needle), array_map('strtolower', $haystack), $strict);
    }
}