Runtime Configuration

The behaviour of these functions is affected by
settings in php.ini.

For further details and definitions of the PHP_INI_* modes, see the
Where a
configuration setting may be set.

Here’s a short explanation of the configuration
directives.

output_buffering boolean/integer

You can enable output buffering for all files by
setting this directive to ‘On’. If you wish to limit the size of
the buffer to a certain size – you can use a maximum number of
bytes instead of ‘On’, as a value for this directive (e.g.,
output_buffering=4096). This directive is always Off in
PHP-CLI.

output_handler string

You can redirect all of the output of your scripts
to a function. For example, if you set output_handler to
mb_output_handler(), character encoding
will be transparently converted to the specified encoding. Setting
any output handler automatically turns on output buffering.

Note:

You cannot use both mb_output_handler() with ob_iconv_handler() and you cannot use both
ob_gzhandler() and zlib.output_compression.

Note:

Only built-in functions can be used with this
directive. For user defined functions, use ob_start().

implicit_flush boolean

FALSE by default.
Changing this to TRUE tells PHP to
tell the output layer to flush itself automatically after every
output block. This is equivalent to calling the PHP function
flush() after each and every call to
print or echo and each and
every HTML block.

When using PHP within an web environment, turning
this option on has serious performance implications and is
generally recommended for debugging purposes only. This value
defaults to TRUE when operating under
the CLI SAPI.

See also ob_implicit_flush().

url_rewriter.tags string

url_rewriter.tags specifies
which HTML tags are rewritten by output_add_rewrite_var() values. Defaults to
a=href,area=href,frame=src,input=src,form=
form is special tag. <input
hidden=”session_id” name=”session_name”> is added as form
variable.

Note: Before
PHP 7.1.0, url_rewriter.tags was used to specify session.trans_sid_tags. As of PHP 7.1.0,
fieldset is no longer considered as special
tag.

url_rewriter.hosts string

url_rewriter.hosts specifies
which hosts are rewritten to include output_add_rewrite_var() values. Defaults to
$_SERVER[‘HTTP_HOST’]. Multiple hosts can be specified by
“,”, no space is allowed between hosts. e.g.
php.net,wiki.php.net,bugs.php.net