E_STRICT messages thrown though not set - php

Since updating my testing server to PHP 5.3.3 (Debian Squeeze) I encountered strange behaviour regarding the error reporting in PHP.
I set error_reporting like this:
error_reporting(E_ALL);
and checked the setting via
echo error_reporting();
which echoes 30719. According to php.net this means "All errors and warnings, as supported, except of level E_STRICT.".
But in the very next line (a class definition abstract class formInputContainer extends formContainer implements formElementValueable { ... }) this results in the message:
Strict (2048): Declaration of formInputContainer::addElement() should be compatible with that of formContainer::addElement()
Why is the E_STRICT message echoed though it's not set? Even changing to E_ALL & ~E_STRICT does not help.

The reason you're seeing them even though they are not set, is that these are thrown at compile time (well, parse time). That means the errors are triggered before your error_reporting() call is made. The real fix is to change the php.ini setting to remove E_STRICT from the definition. To make sure you're editing the correct file, check phpinfo().

If this is a custom error handler (set via set_error_handler()), you'll have to check the current error_reporting level by yourself. A custom error handler gets all error messages:
The manual says:
It is important to remember that the standard PHP error handler is completely bypassed for the error types specified by error_types unless the callback function returns FALSE. error_reporting() settings will have no effect and your error handler will be called regardless - however you are still able to read the current value of error_reporting and act appropriately.

Related

PHP throwing E_DEPRECATED even though disabled via error_reporting

I recently upgraded to PHP 8.1 and did my best to fix instances of where NULL was being passed to built-in functions such as trim() or strtolower(). As expected, I missed some. However, it seems that the exceptions thrown by this in PHP are not E_DEPRECATED. I can't find what type of exception is documented to be thrown exactly. The migration guide just says the below and the comment in the code makes me think it would throw E_DEPRECATED.
Scalar types for built-in functions are nullable by default, this behaviour is deprecated to align with the behaviour of user-defined functions, where scalar types need to be marked as nullable explicitly.
I have error_reporting in my php.ini set to E_ALL & ~E_DEPRECATED & ~E_STRICT and yet I am still getting exceptions thrown. I log the text of the exception in our database and it sure looks like a deprecation message. Does anyone know what type of error is thrown exactly?
I have an error handler defined but am not passing anything in the second parameter for the error levels. Maybe I am misunderstanding how set_error_handler works in conjunction with error_reporting?

PHP error_reporting: what does "reporting" mean?

I have a PHP REST API endpoint that throws an error:
PHP message: PHP Fatal error: Uncaught Exception: Accessing static property...as non static in...
with the default error_reporting value but returns a correct value if error_reporting is set to 1, which I believe is E_ERROR.
Doesn't error_reporting just control the logging? This seems to control whether the exception is thrown as well, allowing the code to continue as normal.
I come from a Java background, used to using Logback and similar logging frameworks. In these frameworks, the log level refers to a filter for the recipient of the logs, commonly a log file. A log level X means that messages need to be at least level X (or lower than, I forget which) to be logged, but it doesn't affect whether the exception is thrown to begin with.
I had assumed that this was the case with PHP's error_reporting, however, based on the above behavior I am not sure.
I've looked through the PHP docs, but I haven't found a detailed explanationof how error_reporting works
So, my question: What does "reporting" mean here? Does error_reporting control more besides which exceptions/errors are logged?
error_reporting is a bit different with the log level, the argument is a set of toggles for each error type.
For example error_reporting(E_ERROR) only reports errors and error_reporting(E_NOTICE) only reports notices and error_reporting(E_ERROR|E_NOTICE) reports both errors and notices but doesn't report warnings.
FYI the error level of this message "Accessing static property...as non static in..." is E_STRICT in PHP 5 and E_NOTICE in PHP 7 by default.
This is weired because you got an exception, I guess the problem that changes the behaviour of the error is in your error handler.

Why didn't a missing class file throw a PHP error?

Sorted out this issue. Problem was the class file (and the folder, actually) was missing. Puzzled why with display_errors = On and E_ALL | E_STRICT defined (and Apache restarted), this would throw a white screen of death and not an error.
phpinfo() shows that the master value and the local value are the same, so I'm assuming that the error settings are not being overwritten somewhere in the code base (in an .htaccess or ini_set() call).
EDIT
The new object instantiation is here:
$type['content_object'] = new $type['handler_class']();
I also tried instantiating it without the variable, i.e. new Foo(); but still gave WSOD.
There might be an alternative error handler activated. Call restore_error_handler() prior to the line with the error (possibly multiple times) to reactivate PHP's default error handler.

Logging PHP notice errors

I have recently taken over development of a legacy system and want to be able to turn on logging of PHP E_NOTICE's on the deployment environment. The deployment environment ini has the following directives...
error_reporting = E_ALL & ~E_DEPRECATED
display_errors = Off
log_errors = On
I have compared the error_reporting bitmask by using echo (E_ALL & ~E_DEPRECATED).' = '.error_reporting();, and both match, so I know the error_reporting level isn't changed within the system itself, and if I turn display_errors = On notices are displayed, but not logged.
So how can I start logging PHP E_NOTICE's?
Update:
According to #m.p.c in the comments on this answer, errors are being displayed in the browser when display_errors is on, but they aren't appearing in the log. I was assuming errors weren't appearing at all.
Are E_NOTICE errors the only ones that aren't appearing in the log, or are all error types affected? If it's all error types, then the first thing I would check is whether or not error logging is even enabled. Try setting ini_set('log_errors', 'On'); at the top of your script. If that doesn't work, then try setting your log file to something you're sure your server can write to by calling ini_set('error_log', 'your_file_path');. If neither of these work, then I think something is seriously wrong with your PHP install. If either of these fixes work, you can put them into your actual php.ini if you have access.
Original Answer:
Based on the error_reporting level in your question, your PHP install should already be setup to report E_NOTICE errors. If it's not logging these errors, something is wrong. I would suggest turning on display_errors to see if any E_NOTICE errors are displayed. If you can't change the php.ini file, try running ini_set('display_errors', 'On'); at the top of your script. Obviously, these errors will only show up and/or be logged if you trigger one, so you should double check that you're actually doing that somewhere.
One caveat is that the E_DEPRECATED error level was only introduced with PHP 5.3. When I just tested setting E_DEPRECATED on a PHP 5.2 install, PHP responded with errors, and set the error_reporting level to 0, which means it reports no errors at all. While it makes no sense for a pre-5.3 php.ini file to use this setting, I feel it's important to at least raise the possibility that you're using E_DEPRECATED on a server that doesn't support it. If you're not sure of your version, you can run phpinfo() and it will display a page with lots and lots of information, including the version number for your install.
Notwithstanding the above, if I've misunderstood your question and you're only talking about creating your own custom logging, then you need to create a function to run when an error occurs and assign it as the error handler using the set_error_handler() function.
It's important to note that when you use set_error_handler(), you bypass PHP's default error handler entirely. This means that your error_handler level becomes meaningless. All errors, regardless of their severity, will be passed to the error handler function you've created. The first parameter passed to this function by PHP will be the error number, which is the numeric value of the E_xxx constant of the error that was found. You'll need to write custom code to catch only the errors you want.
For example, to catch only E_NOTICE errors, your function would look like this:
function my_error_handler($errno, $errstr, $errfile, $errline) {
if ($errno == E_NOTICE) {
// handle/log the error
}
}
set_error_handler("my_error_handler");
Turns out the system has a custom Apache ErrorLog directive defined, and I have been tail -f ... the default Apache error_log.
Note to self: always check the web server setup first before posting silly questions on SO!
You can create your own handler
<?php
function myErrorHandler($errno, $errstr, $errfile, $errline)
{
if ($errno == E_USER_NOTICE){
/* log actions here */
}
}
set_error_handler("myErrorHandler");

PHP doesn't display any error

I don't get any PHP error, just get a white page on Firefox, and
Server error
The website encountered an error while retrieving http://example.com/pruebas/prov.php. It may be down for maintenance or configured incorrectly
on Chrome.
This is the code:
if (!ini_get('display_errors')) {
ini_set('display_errors', 1);
}
echo "hola"
echo "hola2";
I intentionally made mistake in the echo "hola" (there's no ';').
I also tried adding to the end of my .htaccess file -> suPHP_ConfigPath /home/username/public_html replacing username with my current username, and then I created a php.ini in public_html with "display_errors = on;". But I'm still not able to get any PHP error.
Your script is dying due to the syntax error before it ever executes, so the ini_set() call is never executed and never takes effect. You'd have to change the setting in the appropriate php.ini.
The actual error message may be in a log file somewhere. Try Apache's error_log, or see if PHP's logging somewhere else.
Make sure that you also have the appropriate error_reporting ini value set as well. You can find more information on PHP.net
Set the error reporting level. The parameter is either an integer representing a bit field, or named constants. The error_reporting levels and constants are described in Predefined Constants, and in php.ini. To set at runtime, use the error_reporting() function. See also the display_errors directive.
In PHP 4 and PHP 5 the default value is E_ALL & ~E_NOTICE. This setting does not show E_NOTICE level errors. You may want to show them during development.
Source
Make sure the display_errors is set to on on your php.ini file.

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