error_log
error_log
(PHP 4, PHP 5, PHP 7)
error_log — Send an error message to the defined error handling routines
Description
bool error_log ( string $message [, int $message_type = 0 [, string $destination [, string $extra_headers ]]] )
Sends an error message to the web server's error log or to a file.
Parameters
message
The error message that should be logged.
message_type
Says where the error should go. The possible message types are as follows:
| 0 | message is sent to PHP's system logger, using the Operating System's system logging mechanism or a file, depending on what the error_log configuration directive is set to. This is the default option. |
|---|---|
| 1 | message is sent by email to the address in the destination parameter. This is the only message type where the fourth parameter, extra_headers is used. |
| 2 | No longer an option. |
| 3 | message is appended to the file destination. A newline is not automatically added to the end of the message string. |
| 4 | message is sent directly to the SAPI logging handler. |
destination
The destination. Its meaning depends on the message_type parameter as described above.
extra_headers
The extra headers. It's used when the message_type parameter is set to 1. This message type uses the same internal function as mail() does.
Return Values
Returns TRUE on success or FALSE on failure.
Notes
Warning
error_log() is not binary safe. message will be truncated by null character.
Tip
message should not contain null character. Note that message may be sent to file, mail, syslog, etc. Use appropriate conversion/escape function, base64_encode(), rawurlencode() or addslashes() before calling error_log().
Examples
Example #1 error_log() examples
<?php
// Send notification through the server log if we can not
// connect to the database.
if (!Ora_Logon($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"
}
// 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 message_type. |
← error_get_last
error_reporting →
© 1997–2017 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
