Source of func.inc.php - Zabbix

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        case 4: return _('Thursday');
        case 5: return _('Friday');
        case 6: return _('Saturday');
        case 0:
        case 7: return _('Sunday');
    }
​
    return _s('[Wrong value for day: "%1$s" ]', $num);
}
​
// Convert seconds (0..SEC_PER_WEEK) to string representation. For example, 212400 -> 'Tuesday 11:00'
function dowHrMinToStr($value, $display24Hours = false) {
    $dow = $value - $value % SEC_PER_DAY;
    $hr = $value - $dow;
    $hr -= $hr % SEC_PER_HOUR;
    $min = $value - $dow - $hr;
    $min -= $min % SEC_PER_MIN;
​
    $dow /= SEC_PER_DAY;
    $hr /= SEC_PER_HOUR;
    $min /= SEC_PER_MIN;
​
    if ($display24Hours && $hr == 0 && $min == 0) {
        $dow--;
        $hr = 24;
    }
​
    return sprintf('%s %02d:%02d', getDayOfWeekCaption($dow), $hr, $min);
}
​
// Convert Day Of Week, Hours and Minutes to seconds representation. For example, 2 11:00 -> 212400. false if error occurred
function dowHrMinToSec($dow, $hr, $min) {
    if (zbx_empty($dow) || zbx_empty($hr) || zbx_empty($min) || !zbx_ctype_digit($dow) || !zbx_ctype_digit($hr) || !zbx_ctype_digit($min)) {
        return false;
    }
​
    if ($dow == 7) {
        $dow = 0;
    }
​
    if ($dow < 0 || $dow > 6) {
        return false;
    }
​
    if ($hr < 0 || $hr > 24) {
        return false;
    }
​
    if ($min < 0 || $min > 59) {
        return false;
    }
​
    return $dow * SEC_PER_DAY + $hr * SEC_PER_HOUR + $min * SEC_PER_MIN;
}
​
/**
 * Convert time to a string representation. Return 'Never' if timestamp is 0.
 *
 * @param             $format
 * @param null        $time
 * @param string|null $timezone
 *
 * @throws Exception
 *
 * @return string
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            $result['second'][] = $array;
        }
        elseif (isset($second[$array[$field]])) {
            $result['second'][] = $array;
        }
    }
​
    return $result;
}
​
function zbx_array_push(&$array, $add) {
    foreach ($array as $key => $value) {
        foreach ($add as $newKey => $newValue) {
            $array[$key][$newKey] = $newValue;
        }
    }
}
​
/**
 * Find if array has any duplicate values and return an array with info about them.
 * In case of no duplicates, empty array is returned.
 * Example of usage:
 *     $result = zbx_arrayFindDuplicates(
 *         array('a', 'b', 'c', 'c', 'd', 'd', 'd', 'e')
 *     );
 *     array(
 *         'd' => 3,
 *         'c' => 2,
 *     )
 *
 * @param array $array
 *
 * @return array
 */
function zbx_arrayFindDuplicates(array $array) {
    $countValues = array_count_values($array); // counting occurrences of every value in array
    foreach ($countValues as $value => $count) {
        if ($count <= 1) {
            unset($countValues[$value]);
        }
    }
    arsort($countValues); // sorting, so that the most duplicates would be at the top
​
    return $countValues;
}
​
/************* STRING *************/
function zbx_nl2br($str) {
    $str_res = [];
    foreach (explode("\n", $str) as $str_line) {
        array_push($str_res, $str_line, BR());
    }
    array_pop($str_res);
​
    return $str_res;
}