Various useful php functions

Functions.php

<?php

/**
 * Returns fixed floating number with precision of $precision. Replaces "," to "." and " " to "".
 *
 * @param $input mixed
 * @param $precision int
 * @return float
 */
function fixFloat($input, $precision = -1)
{
    $input = str_replace([',', ' '], ['.', ''], $input);

    return ($precision === -1 ? (double)$input : round((double)$input, $precision));
}


/**
 * Trim characters, can be used with array_walk
 *
 * @param $value mixed
 * @param $pos int
 * @param $character_mask string Characters to trim
 * @return mixed
 */
function trimChars(&$value, $pos, $character_mask = " \t\n\r\0\x0B")
{
    /*
        Unicode variant:
            $value = preg_replace('/^['.$character_mask.']*(?U)(.*)['.$character_mask.']*$/u', '\\1', $value);
    */
    $value = trim($value, $character_mask);
}


/**
 * Locale specific number_format
 *
 * @param $number int|float
 * @param $decimals int Precision
 * @return float
 */
function localeNumberFormat($number, $decimals = 2)
{
    $locale = localeconv();
    return number_format($number, $decimals, $locale['decimal_point'], $locale['thousands_sep']);
}


/**
 * Returns unique uuid4 value
 *
 * @return string
 */
function uuid4()
{
    $data = openssl_random_pseudo_bytes(16);

    $data[6] = chr(ord($data[6]) & 0x0f | 0x40); // set version to 0100
    $data[8] = chr(ord($data[8]) & 0x3f | 0x80); // set bits 6-7 to 10

    return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
}


/**
 * Returns array containing week's start and week's end
 *
 * @param $week int A Week
 * @param $year int of a Year
 * @return array
 */
function weekRange($week, $year = null)
{
    if (empty($year)) {
        $year = date('Y');
    }

    $week -= 1;
    $ts = strtotime("{$year}0104 +{$week} weeks"); // By http://en.wikipedia.org/wiki/ISO_8601#Week_dates
    $start = (date('w', $ts) == 1) ? $ts : strtotime('last monday', $ts);

    return array($start, strtotime('next sunday', $start));
}


/**
 * Returns how many weeks there will be or was in a specific year.
 *
 * @param $year int A year
 */
function getIsoWeeksInYear($year)
{
    $date = new DateTime;
    $date->setISODate($year, 53);
    return ($date->format("W") === "53" ? 53 : 52);
}


/**
 * Returns array containing only values with their keys whose keys are in $keys parameter.
 * Also can return false if $required is specified and any of $keys are missing.
 * Also can fill missing keys with $fill_missing, if its other than false
 *
 * @param $array array Original array
 * @param $keys array Array of keys
 * @param $required bool Whether return false if there are missing keys
 * @param $fill_missing bool|mixed Fill missing keys with this value
 * @return array
 */
function extractArrayByKeys($array, $keys, $required = false, $fill_missing = false)
{
    // Check if input is an array
    if (is_array($array) === false) {
        return false;
    }

    // Build new array
    $new_array = [];
    foreach ($keys as $key) {
        if (isset($array[$key])) {
            $new_array[$key] = $array[$key];
        } else if ($required === true) {
            return false;
        } else if ($fill_missing !== false) {
            $new_array[$key] = $fill_missing;
        }
    }

    // Return new array
    return $new_array;
}


/**
 * Returns a boolean value representing whether any of the passed array elements are empty
 *
 * @return boolean
 */
function anyEmpty($array)
{
    return (count($array) !== count(array_filter($array)));
}


/**
 * Returns a boolean value representing whether all of the passed array elements are empty
 *
 * @return boolean
 */
function allEmpty($array)
{
    return (count(array_filter($array)) === 0);
}

/**
 * Returns string pointing to a (somehow) random temporary filename
 *
 * @return string
 */
function tmpFilename($prefix = 'tmp_', $postfix = '')
{
    $random = uniqid(rand(), true);
    $random = str_replace('.', '_', $random);
    $filename = sys_get_temp_dir().'/'.$prefix.$random.$postfix;
    return $filename;
}

/**
 * Group $array by $keys.
 * When $keys == ['id', 'name'], Turns [['id' => 1, 'name' => 'Name 1'], ['id' => 2, 'name' => 'Name 2'] into
 * [1 => ['Name 1' => ['id' => 1, 'name' => 'Name 1']], 2 => ['Name 2' => ['id' => 2, 'name' => 'Name 2']]]
 *
 * @param  iterator $array
 * @param  mixed    $keys
 * @param  bool     $unique Describes whether last key of input array is unique
 * @return array[]  Returns array grouped by keys
 */
function groupArray($array, $keys = [], $unique = false)
{
    $keys = (array)$keys;
    $result = [];

    foreach ($array as $item) {
        $x = &$result;
        foreach ($keys as $key) {
            $x = &$x[$item[$key]];
        }

        if ($unique === true) {
            $x = $item;
        } else {
            $x[] = $item;
        }
    }

    return $result;
}


/**
 * Returns wheather date has a valid ISO8601 format.
 *
 * @param  string Date string
 * @return bool   Returns true or false
 */
function validISODate($date)
{
    return preg_match('/([0-9]{4})-([0-9]{2})-([0-9]{2})/', $date);
}


/**
 * Returns wheather datetime has a valid ISO8601 format.
 *
 * @param  string Datetime string
 * @return bool   Returns true or false
 */
function validISODateTime($datetime)
{
    return preg_match(
        '/^'.
            '(\d{4})-(\d{2})-(\d{2})T'. // YYYY-MM-DDT ex: 2014-01-01T
            '(\d{2}):(\d{2}):(\d{2})'.  // HH-MM-SS  ex: 17:00:00
            '(Z|((-|\+)\d{2}:\d{2}))'.  // Z or +01:00 or -01:00
        '$/'
        , $datetime
    );
}