   #PHP Manual Error Handling and Logging Functions debug_print_backtrace
   error_reporting

   PHP Manual
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                                   error_log

   (PHP 3, PHP 4 )
   error_log -- Send an error message somewhere

Description

   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.

   Warning

   Remote debugging via TCP/IP is a PHP 3 feature that is not available
   in PHP 4.

   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");
   ?>
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