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(PHP 3, PHP 4, PHP 5)

ora_rollback -- Rolls back a transaction

Description

bool ora_rollback ( resource connection )

This function undoes an Oracle transaction. (See ora_commit() for the definition of a transaction.)

Returns TRUE on success or FALSE on failure. Details about the error can be retrieved using the ora_error() and ora_errorcode() functions.

XCVI. Output Control Functions

Introduction

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.

Requirements

No external libraries are needed to build this extension.

Installation

There is no installation needed to use these functions; they are part of the PHP core.

Runtime Configuration

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

Table 1. Output Control configuration options

Name Default Changeable Changelog output_buffering "0" PHP_INI_PERDIR   output_handler NULL PHP_INI_PERDIR Available since PHP 4.0.4. implicit_flush "0" PHP_INI_ALL PHP_INI_PERDIR in PHP <= 4.2.3. For further details and definitions of the PHP_INI_* constants, see the Appendix H .

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.

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 .

Related Function(s)

ora_commit()

ora_error()

ora_errorcode()

header()

setcookie()

echo()

mb_output_handler()

ob_iconv_handler()

ob_gzhandler()

ob_start()

flush()

print()

ob_implicit_flush()

ob_end_flush()

ob_clean()

ob_end_clean()

ob_flush()

ob_get_clean()

ob_get_contents()

ob_get_flush()

ob_get_length()

ob_get_level()

ob_get_status()

ob_list_handlers()

output_add_rewrite_var()

output_reset_rewrite_vars()