создание и продвижение сайта (вбиваю в ТОП-10, как гвозди)Настройка и сопровождение платной рекламы яндекс.директ

PHP. Руководство по PHP. 2005

ob_start

ob_start

(PHP 4, PHP 5)ob_start -- Turn on output buffering

Description

bool ob_start ([callback output_callback [, int chunk_size [, bool erase]]])

This function will turn output buffering on. While output

buffering is active no output is sent from the script (other than

headers), instead the output is stored in an internal buffer.

The contents of this internal buffer may be copied into a string

variable using ob_get_contents(). To output

what is stored in the internal buffer, use

ob_end_flush(). Alternatively,

ob_end_clean() will silently discard the

buffer contents.

An optional output_callback function may

be specified. This function takes a string as a parameter and

should return a string. The function will be called when

ob_end_flush() is called, or when the output

buffer is flushed to the browser at the end of the request. When

output_callback is called, it will receive

the contents of the output buffer as its parameter and is

expected to return a new output buffer as a result, which will be

sent to the browser. If the output_callback is not

a callable function, this function will return FALSE.

If the callback function has two parameters, the second parameter is filled

with a bit-field consisting of

PHP_OUTPUT_HANDLER_START,

PHP_OUTPUT_HANDLER_CONT and

PHP_OUTPUT_HANDLER_END.

Замечание:

In PHP 4.0.4, ob_gzhandler() was introduced

to facilitate sending gz-encoded data to web browsers that

support compressed web pages. ob_gzhandler()

determines what type of content encoding the browser will accept

and will return its output accordingly.

Замечание:

Before PHP 4.3.2 this function did not return FALSE in case the passed

output_callback can not be executed.

Внимание

Some web servers (e.g. Apache) change the working directory of a script

when calling the callback function. You can change it back by e.g.

chdir(dirname($_SERVER['SCRIPT_FILENAME'])) in the

callback function.

If the optional parameter chunk_size is passed, the

callback function is called on every first newline after

chunk_size bytes of output.

The output_callback parameter may be bypassed by

passing a NULL value.

If the optional parameter erase is set to FALSE,

the buffer will not be deleted until the script finishes (as of PHP 4.3.0).

Output buffers are stackable, that is, you may call

ob_start() while another

ob_start() is active. Just make

sure that you call ob_end_flush()

the appropriate number of times. If multiple output callback

functions are active, output is being filtered sequentially

through each of them in nesting order.

ob_end_clean(),

ob_end_flush(), ob_clean(),

ob_flush() and ob_start()

may not be called from a callback function. If you call them from

callback function, the behavior is undefined. If you would like to

delete the contents of a buffer, return "" (a null string) from callback

function.

You can't even call functions using the output buffering functions like

print_r($expression, true) or

highlight_file($filename, true) from a callback

function.

Пример 1. User defined callback function example


<?php

function callback($buffer)
{
// replace all the apples with oranges
return (str_replace("apples", "oranges", $buffer));
}

ob_start("callback");

?>
<html>
<body>
<p>It's like comparing apples to oranges.</p>
</body>
</html>
<?php

ob_end_flush();

?>

Would produce:

<html>
<body>
<p>It's like comparing oranges to oranges.</p>
</body>
</html>

See also ob_get_contents(),

ob_end_flush(),

ob_end_clean(),

ob_implicit_flush(),

ob_gzhandler(), ob_iconv_handler()

mb_output_handler(), and

ob_tidyhandler().

ob_list_handlers

Уровень выше

output_add_rewrite_var

Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.

Free Web Hosting