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error_log(3) [php man page]

ERROR_LOG(3)								 1							      ERROR_LOG(3)

error_log - Send an error message to the defined error handling routines

SYNOPSIS
bool error_log (string $message, [int $message_type], [string $destination], [string $extra_headers]) DESCRIPTION
Sends an error message to the web server's error log or to a file. PARAMETERS
o $message - The error message that should be logged. o $message_type - Says where the error should go. The possible message types are as follows: error_log(3) log types +--+---------------------------------------------------+ |0 | | | | | | | $message is sent to PHP's system logger, using | | | the Operating System's system logging mechanism | | | or a file, depending on what the error_log con- | | | figuration directive is set to. This is the | | | default option. | | | | |1 | | | | | | | $message is sent by email to the address in the | | | $destination parameter. This is the only message | | | type where the fourth parameter, $extra_headers | | | is used. | | | | |2 | | | | | | | No longer an option. | | | | |3 | | | | | | | $message is appended to the file $destination. A | | | newline is not automatically added to the end of | | | the $message string. | | | | |4 | | | | | | | $message is sent directly to the SAPI logging | | | handler. | | | | +--+---------------------------------------------------+ o $destination - The destination. Its meaning depends on the $message_type parameter as described above. o $extra_headers - The extra headers. It's used when the $message_type parameter is set to 1. This message type uses the same internal function as mail(3) does. RETURN VALUES
Returns TRUE on success or FALSE on failure. NOTES
Warning error_log(3) is not binary safe. $message will be truncated by null character. Tip $message should not contain null character. Note that $message may be sent to file, mail, syslog, etc. Use appropriate conver- sion/escape function, base64_encode(3), rawurlencode(3) or addslashes(3) before calling error_log(3). EXAMPLES
Example #1 error_log(3) examples <?php // Send notification through the server log if we can not // connect to the database. if (!Ora_Logon($username, $password)) { error_log("Oracle database not available!", 0); } // Notify administrator by email if we run out of FOO if (!($foo = allocate_new_foo())) { error_log("Big trouble, we're all out of FOOs!", 1, "operator@example.com"); } // another way to call error_log(): error_log("You messed up!", 3, "/var/tmp/my-errors.log"); ?> CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.2.7 | | | | | | | The possible value of 4 was added to $mes- | | | sage_type. | | | | +--------+---------------------------------------------------+ PHP Documentation Group ERROR_LOG(3)

Check Out this Related Man Page

OPENLOG(3)								 1								OPENLOG(3)

openlog - Open connection to system logger

SYNOPSIS
bool openlog (string $ident, int $option, int $facility) DESCRIPTION
openlog(3) opens a connection to the system logger for a program. The use of openlog(3) is optional. It will automatically be called by syslog(3) if necessary, in which case $ident will default to FALSE. PARAMETERS
o $ident - The string $ident is added to each message. o $option - The $option argument is used to indicate what logging options will be used when generating a log message. openlog(3) Options +-----------+---------------------------------------------------+ | Constant | | | | | | | Description | | | | +-----------+---------------------------------------------------+ | | | | LOG_CONS | | | | | | | if there is an error while sending data to the | | | system logger, write directly to the system con- | | | sole | | | | | | | |LOG_NDELAY | | | | | | | open the connection to the logger immediately | | | | | | | |LOG_ODELAY | | | | | | | (default) delay opening the connection until the | | | first message is logged | | | | | | | |LOG_PERROR | | | | | | | print log message also to standard error | | | | | | | | LOG_PID | | | | | | | include PID with each message | | | | +-----------+---------------------------------------------------+ You can use one or more of this options. When using multiple options you need to OR them, i.e. to open the connection immediately, write to the console and include the PID in each message, you will use: LOG_CONS | LOG_NDELAY | LOG_PID o $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 facilities will be handled. openlog(3) Facilities +---------------------------+---------------------------------------------------+ | Constant | | | | | | | Description | | | | +---------------------------+---------------------------------------------------+ | | | | LOG_AUTH | | | | | | | security/authorization messages (use LOG_AUTH- | | | PRIV instead in systems where that constant is | | | defined) | | | | | | | | LOG_AUTHPRIV | | | | | | | security/authorization messages (private) | | | | | | | | LOG_CRON | | | | | | | clock daemon (cron and at) | | | | | | | | LOG_DAEMON | | | | | | | other system daemons | | | | | | | | LOG_KERN | | | | | | | kernel messages | | | | | | | |LOG_LOCAL0 ... LOG_LOCAL7 | | | | | | | reserved for local use, these are not available | | | in Windows | | | | | | | | LOG_LPR | | | | | | | line printer subsystem | | | | | | | | LOG_MAIL | | | | | | | mail subsystem | | | | | | | | LOG_NEWS | | | | | | | USENET news subsystem | | | | | | | | LOG_SYSLOG | | | | | | | messages generated internally by syslogd | | | | | | | | LOG_USER | | | | | | | generic user-level messages | | | | | | | | LOG_UUCP | | | | | | | UUCP subsystem | | | | +---------------------------+---------------------------------------------------+ Note LOG_USER is the only valid log type under Windows operating systems RETURN VALUES
Returns TRUE on success or FALSE on failure. SEE ALSO
syslog(3), closelog(3). PHP Documentation Group OPENLOG(3)

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