Complete 3.0 upgrade notes about NULL returned on missing items
[ci skip] Alter a changelog line
Merge pull request #2566 from vlakoff/develop

Complete 3.0 upgrade notes about NULL returned on missing items
Fix #2501 & another -related bug
Fix #2585
Various typos and tabs adjustments
Replace php_sapi_name() function with PHP_SAPI constant

exact same behavior but faster, shorter
Merge pull request #2586 from vlakoff/develop

Various typos and tabs adjustments