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int error_log (string message, int message_type [, string
destination [, string
extra_headers]])
Sends an error message to the web server's error log, a
TCP port or to a file. The first parameter,
message, is the error message that should
be logged. The second parameter,
message_type says where the message should
go:
Table 1. error_log() 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 configuration
directive is set to.
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. This message
type uses the same internal function as
Mail() does.
2
message is sent through the PHP
debugging connection. This option is only available if
remote debugging has been
enabled. In this case, the
destination parameter specifies the
host name or IP address and optionally, port number, of the
socket receiving the debug information.
3
message is appended to the file
destination.
Example 1. error_log() examples
// 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@mydomain.com");
}
// other ways of calling error_log():
error_log ("You messed up!", 2, "127.0.0.1:7000");
error_log ("You messed up!", 2, "loghost");
error_log ("You messed up!", 3, "/var/tmp/my-errors.log");
