How to change php.ini by PHP?

[Tracey Gallingtonc]

\[code\]short_open_tag = On\[/code\]Is it possible?EDITI tried this :\[code\]<?phpif (!ini_get('short_open_tag')) { ini_set('short_open_tag', 'On');}$a=1;?><?=$a;?>\[/code\]which outputs \[code\]<?=$a;?>\[/code\],so it's not working.