Please tell me how to change a php_value using a .htaccess configuration file.
Including the procedure for it.

Just write e.g., like this, in a single line. This changes value for directory (and sub-directories) in which .htaccess.

php_value register_globals 0

Not all values can be changed; directory level: see PHP manual.

Regards,

`~@#\^%&*/\.<.\/-|+|_!:;..=?>
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If you find that your setting cannot be updated using a .htaccess file, consider using ini_set(), instead: http://uk.php.net/manual/en/function.ini-set.php. Settings overridden using a call to the ini_set() only hold for the execution time of the script that the call is made in, and for that part of the execution time after the call is made (along with any scripts that are included after this point, as well, of course).

You could, if you wanted, switch certain settings on and off in this way, as you made your way down the page: in the absence of anything better, this approach can be used as a rudimentary form of runtime debugging.