PHP function openlog()

11. 09. 2019

Obsah článku

Available in `PHP 4`, `PHP 5`, `PHP 7`

Opens a connection to the system logger.

Parameters

Parameter	Data type	Default value	Note
`$ident`	`string`	not	Identifier (of type `string`) to be added to the message.
`$option`	`int`	not	The `$option` argument is used to indicate which logging options will be used when generating the log message. Details below.
`$facility`	`int`	not	The `$facility` argument is used to indicate what type of program logs the message. This allows you to specify (in your machine's syslog configuration) how messages coming from different devices will be handled. Details below.

`$option`

The $option argument is used to indicate which logging options will be used when generating a log message.

Possible values:

Constant	Description
LOG_CONS	If an error occurs when writing to the logger (or sending data), it prints a message to the system console.
LOG_NDELAY	Immediately opens a connection to the logger.
LOG_ODELAY	(default) Delay between writing individual messages. It is mainly used when writing the first message to the logger.
LOG_PERROR	Print the logged error also as a standard PHP error.
LOG_PID	Include the `PID` number in the message.

You can select one or more options.

If you use multiple options, use the OR logical notation between constants.

For example: LOG_CONS | LOG_NDELAY | LOG_PID.

`$facility`

The $facility argument is used to specify what type of program is logging the message. This allows you to specify (in your machine's syslog configuration) how messages coming from different devices will be handled.

Constant	Description
LOG_AUTH	Security or authorization messages. If this constant is not defined on your system, use `LOG_AUTHPRIV`.
LOG_AUTHPRIV	Security or authorization messages. Private Message.
LOG_CRON	Hourly retries (cron).
LOG_DAEMON	System deamon that waits for events.
LOG_KERN	Messages from the operating system kernel.
LOG_LOCAL0 ... LOG_LOCAL7	Reserved for use on a specific local device or server. Not available on Windows.
LOG_LPR	Subsystem for line dump.
LOG_MAIL	Subsystem for handling e-mail and mail server.
LOG_NEWS	Subsystem for handling news and messages (`USENET`).
LOG_SYSLOG	Messages generated internally by syslogd (may contain system messages from the operating system).
LOG_USER	Default messages defined by the user or a specific extension. They are not system messages.
LOG_UUCP	Subsystem `UUCP`.

Return values

bool - returns true on success, false on error.

Other resources

[Official openlog function documentation](Official PHP.net documentation)

Jan Barášek Více o autorovi

Autor článku pracuje jako seniorní vývojář a software architekt v Praze. Navrhuje a spravuje velké webové aplikace, které znáte a používáte. Od roku 2009 nabral bohaté zkušenosti, které tímto webem předává dál.

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