Fixed: JSON_PRETTY_PRINT constant not available in PHP < 5.4.0

    [feedquote='i-MSCP Github (1.2.x) (nuxwin)','https://github.com/i-MSCP/imscp/commit/aff7ba3ae8a56cd1b74ab8aa835a95d8368b5c0a']

    Code
    1. Fixed: JSON_PRETTY_PRINT constant not available in PHP
    2. [/feedquote]