PHP error_log() function

PHP Error and Logging Functions

Example

Send the error message to the web server log and email account:

<?php
// If there is an error connecting to the database, send an error message to the server log
if (!mysqli_connect("localhost","bad_user","bad_password","my_db")) {
    error_log("Failed to connect to database!", 0);
}
// If FOO is exhausted, send an email to the administrator
if (!($foo = allocate_new_foo())) {
    error_log("Oh no! We are out of FOOs!", 1, "admin@example.com");
}
?>

Definition and Usage

The error_log() function sends error messages to the server error log, file, or remote target.

Syntax

error_log(message,type,destination,headers);
Parameter Description
message Required. Specifies the error message to be logged.
type

Optional. Specifies where the error should be sent. Possible values:

  • 0 - Default. The message is sent to PHP's system log, using the operating system's log mechanism or a file, depending on how the error_log directive is configured in php.ini.
  • 1 - The message is sent to the parameter destination The email address set. The fourth parameter extra_headers It is only used in this type.
  • 2 - No longer used (used only in PHP 3)
  • 3 - The message is sent to the location specified by destination file. Character message It will not be treated as a new line by default.
  • 4 - The message is sent directly to the SAPI log handler.
destination Optional. Specifies the target of the error message. The value is determined by type The value of the parameter determines.
headers

Optional. Specifies additional headers, such as From, Cc, and Bcc. This information type uses the same built-in function as mail().

Only when message_type Used when set to 1.

CRLF (\r\n) should be used to separate multiple headers.

Technical Details

Return Value: Returns TRUE on success, FALSE on failure.
PHP Version: 4.0+
PHP Update Log: PHP 5.2.7: Possible values: 4 Added to type Parameters.

PHP Error and Logging Functions