php错误和异常处理
错误处理函数1. error_reporting — Sets which PHP errors are reported
2. ini_set — Sets
the value of a configuration option
3.ini_get — Gets the value of a configuration
option
4.error_log — Send an error message
somewhere
bool error_log ( string $message [, int $message_type = 0 [, string $destination [, string $extra_headers ]]] )
##Sends an
error message to the web server's error log or to a file.
##这个可用于内部通知（通知程序员或者管理员，而且只能让他们看到，而网站访问者看不到）
<?php
// Send notification through the server log if we can not
// connect to the database.
if (!Ora_Logon($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");
?>
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