PHP5中文手册·Send an error message somewhere -- 追寻梦想＞编程乐园＞PHP 编程

说明

bool 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.

参数

message

The error message that should be logged.

message_type

Says where the error should go. The possible message types are as follows:

**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. 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	`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. This option is only available in PHP 3.
3	`message` is appended to the file `destination` . A newline is not automatically added to the end of the `message` string.

destination

The destination. Its meaning depends on the message_type parameter as described above.

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() does.

返回值

如果成功则返回 TRUE，失败则返回 FALSE。

范例

Example#1 error_log() 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");
}

// 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");
?>