• Installing/Configuring
  • Runtime Configuration

  • Runtime Configuration
  • Runtime Configuration

    Runtime Configuration

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

    Output Control configuration
    Name Default Changeable Changelog
    output_buffering “0” PHP_INI_PERDIR  
    output_handler NULL PHP_INI_PERDIR  
    implicit_flush “0” PHP_INI_ALL  
    url_rewriter.tags “a=href,area=href,frame=src,form=,fieldset=” PHP_INI_ALL Before PHP 7.1.0, this was used to set session’s trans sid
    rewrite. From PHP 7.1.0, it is only used by output_add_rewrite_var().
    url_rewriter.hosts $_SERVER[‘HTTP_HOST’] is used as default. PHP_INI_ALL Available as of PHP 7.1.0

    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

    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

    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.


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


    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

    form is special tag. <input
    hidden=”session_id” name=”session_name”>
    is added as form

    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

    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.