Output Control Functions

Introductie

The Output Control functions allow you to control when output is sent from the script. This can be useful in several different situations, especially if you need to send headers to the browser after your script has began outputting data. The Output Control functions do not affect headers sent using header() or setcookie(), only functions such as echo() and data between blocks of PHP code.

Note: When upgrading from PHP 4.1.x (and 4.2.x) to 4.3.x due to a bug in earlier versions you must ensure that implict_flush is OFF in your php.ini, otherwise any output with ob_start() will not be hidden from output.

Afhankelijkheden

Deze functies zijn beschikbaar als onderdeel van de standaard module die altijd beschikbaar is.

Installatie

Er zijn geen handelingen nodig m.b.t. tot installatie voor deze functies, deze maken deel uit van de kern van PHP.

Configuratie tijdens scriptuitvoer

Het gedrag van deze functies wordt beïnvloed vanuit php.ini.

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). As of PHP 4.3.5, 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().

Resource types

Deze extensie maakt geen gebruik van resources.

Voorgedefinieerde constanten

Deze extensie definieert geen constanten.

Voorbeelden

In the above example, the output from echo() would be stored in the output buffer until ob_end_flush() was called. In the mean time, the call to setcookie() successfully stored a cookie without causing an error. (You can not normally send headers to the browser after data has already been sent.)

Zie ook

See also header() and setcookie().