How to change php.ini by PHP?

Question

short_open_tag = On

Is it possible?

EDIT

I tried this :

<?php
if (!ini_get('short_open_tag')) {
    ini_set('short_open_tag', 'On');
}
$a=1;



?>
<?=$a;?>

which outputs <?=$a;?>,so it's not working.

Answer 1

Yes, ini_set() is what you want.

EDIT: Added an example

if (!ini_get('short_open_tag')) {
    ini_set('short_open_tag', 'on');
}

Answer 2

Although you can use ini_set, be careful (quoted from the PHP Documentation)

Not all the available options can be changed using ini_set(). There is a list of all available options in the appendix.

If you are changing options like magic_quotes, short_open_tags, that's OK. But if you are going to change safe_mode, enable_dl, etc. you might face certain problems.

Answer 3

if you want to change it during a session and forget about it later, use ini_get() and ini_set(). If you want to actually modify php.ini programmatically, you can parse the ini file using parse_ini_file, change your options and rewrite back to disk. See here for more

or you can write your own string replacement routine using the normal opening of file, preg_replace() etc..

Answer 4

If you are using PHP 5.3 short_open_tag is no longer an option.

http://php.net/manual/en/ini.core.php

Short tags have been deprecated as of PHP 5.3 and may be removed in PHP 6.0.