Php Debug Error
Contents |
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more error reporting php ini about Stack Overflow the company Business Learn more about hiring developers or posting php error reporting all ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack
Php Display_errors
Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to get useful error messages in PHP? up vote 369
Php Verbose Command Line
down vote favorite 168 I find programming in PHP quite frustrating. Quite often I will try and run the script and just get a blank screen back. No error message, just empty screen. The cause might have been a simple syntax error (wrong bracket, missing semicolon), or a failed function call, or something else entirely. It is very difficult to figure out what went wrong. I end up commenting php error reporting not working out code, entering "echo" statements everywhere, etc. trying to narrow down the problem. But there surely must be a better way, right?. So, is there a way to get PHP to produce useful error message like Java does? Can anyone recommend good PHP debugging tips, tools and techniques? php debugging error-handling share|improve this question edited May 11 '13 at 23:52 hkBattousai 3,67183982 asked May 10 '09 at 9:48 Candidasa 2,95982330 coding.smashingmagazine.com/2011/11/30/… –Alex Jul 15 '12 at 14:54 1 Also see stackoverflow.com/q/1475297/632951 –Pacerier Oct 14 '14 at 9:37 @JuannStrauss, That's understating it. And when you finally see the errors, it says T_PAAMAYIM_NEKUDOTAYIM. Or maybe "must be an instance of integer, integer given". –Pacerier Apr 3 '15 at 20:02 Tutorial on this: code2real.blogspot.com/2015/06/… –Pupil Sep 9 '15 at 7:21 add a comment| 27 Answers 27 active oldest votes up vote 355 down vote accepted For syntax errors, you need to enable error display in the php.ini. By default these are turned off because you don't want a "customer" seeing the error messages. Check this page in the PHP documentation for information on the 2 directives: error_reporting and display_errors. display_errors is probably the one you want to change. If you
and found it very interesting, thought it might be something for you. The article is called How to Debug in PHP and is located at http://blog.teamtreehouse.com/how-to-debug-in-php.CaptchaSubmitNobody enjoys the process of debugging their code. If you want to build killer web apps though, it's vital
Php Error Types
that you understand the process thoroughly. This article breaks down the fundamentals of debugging in PHP, php debug log helps you understand PHP's error messages and introduces you to some useful tools to help make the process a little less painful. Doing your php error log Ground Work It is important that you configure PHP correctly and write your code in such a way that it produces meaningful errors at the right time. For example, it is generally good practice to turn on a verbose level http://stackoverflow.com/questions/845021/how-to-get-useful-error-messages-in-php of error reporting on your development platform. This probably isn't such a great idea, however, on your production server(s). In a live environment you neither want to confuse a genuine user or give malicious users too much information about the inner-workings of your site. So, with that in mind lets talk about the all too common "I'm getting no error message" issue. This is normally caused by a syntax error on a platform where the developer has not done http://blog.teamtreehouse.com/how-to-debug-in-php their ground work properly. First, you should turn display_errors on. This can be done either in your php.ini file or at the head of your code like this: ini_set('display_errors', 'On'); Tip: In these code examples I omit the closing (?>) PHP tag. It is generally considered good practice to do so in files which contain only PHP code in order to avoid accidental injection of white space and the all too common "headers already sent" error. Next, you will need to set an error reporting level. As default PHP 4 and 5 do not show PHP notices which can be important in debugging your code (more on that shortly). Notices are generated by PHP whether they are displayed or not, so deploying code with twenty notices being generated has an impact upon the overhead of your site. So, to ensure notices are displayed, set your error reporting level either in your php.ini or amend your runtime code to look like this: ini_set('display_errors', 'On');
error_reporting(E_ALL); Tip: E_ALL is a constant so don't make the mistake of enclosing it in quotation marks. With PHP 5 it's also a good idea to turn on the E_STRICT level of error reporting. E_STRICT is useful for ensuring you're coding using the best possible standards. For example E_STRICT helps by warning you that you're using a deprecated function. Here's how to enable it at runtime: ini_set('display
test systems for that matter) have them disabled by default. If your PHP script is crashing horribly and you are not getting any runtime error messages, it is likely that this is the https://motoma.io/turning-on-php-debugging-and-error-messages/ case for you.You can initiate PHP debugging messages for the server by changing the display_errors and error_level settings in php.ini. Unfortunately, this is not the best situation in a production system. Luckily, you https://docs.moodle.org/29/en/Debugging can enable error reporting on a page by page basis by simply adding the following lines to the top of your PHP script: The way I like to handle debugging in my systems, php error is create an include file (aptly labeled lib.debugging.php) that enables error reporting, and exposes my code to a couple of really handy functions: I include this file at the top of every PHP page. The trace() and tarr() functions allow me to easily format my own debugging code, and $TRACECOUNT presents a nice interface for knowing where a script failed if it halts unexpectedly. By simply php error reporting toggling the $DEBUGGING variable to false, my code is ready to be tested by QA. When the product is finalize, I remove the include call to lib.debugging.php from my source files altogether. I hope someone finds this useful, Motoma Please enable JavaScript to view the comments powered by Disqus. comments powered by Disqus BitGirl BitGirl is a fully pluggable Python-based IRC bot which allows dynamic command and module loading, unloading, and reloading on the fly. socksipy-branch A Python SOCKS client module This module was designed to allow developers of Python software that uses the Internet or another TCP/IP-based. PyLoris PyLoris is a scriptable tool for testing a server's vulnerability to connection exhaustion denial of service (DoS) attacks. /dev/urandom "It's much better to do good in a way that no one knows anything about it." - Leo Tolstoy, Anna Karenina Blogs I Follow CIA Works Die in a Fire Hacking, Distributed Jacob Kaplan-Moss Known Plaintext Lost Garden { Parsed Content } Particles in Motion Schneier on Security Ted Dziuba root labs rdist Veracode Security Blog Very Official Web Comics Dresden Codak XKCD motoma.io and all content therein is copyright of Christopher Gilbert — © 2016 All rights reserved.
Debugging Web services test client Test course generator JMeter test plan generator Template library Debugging messages can be enabled by an administrator in Administration > Site administration > Development > Debugging. Debugging messages are intended to help diagnose problems and/or help Moodle developers. If you have a problem with your Moodle site and ask for help in a Moodle.org forum, a developer may ask you to turn debug messages on, in order to locate the cause of the problem. By default Moodle does not show any error messages at all. If you are having problems (e.g. blank screens or incomplete screens) turning on debugging is usually the first thing to try. Contents 1 Debugging settings 1.1 Debug messages 1.2 Display debug messages 1.3 Debug email sending 1.4 Performance info 1.5 Show origin of language strings 1.6 Show validator links 1.7 Show page information 2 What to do if you cannot get to the admin screens 2.1 Try typing the URL directly 2.2 In config.php 3 See also Debugging settings Here are the settings on the Debugging page: Debug messages The default is none, your choices are: NONE Do not show any errors or warnings (Default) ALL Show all reasonable PHP debug messages MINIMAL Show only fatal errors NORMAL Show warnings, errors and notices DEVELOPER extra Moodle debug messages for developers There is rarely any advantage in going to Developer level, unless you are a developer, in which case it is strongly recommended. Once you have got the error message, and copied and pasted it somewhere. HIGHLY RECOMMENDED to turn Debug back to NONE. Debug messages can give clues to a hacker as to the setup of your site. Display debug messages There is an option to choose whether to display error messages or simply record them in the server logs. Debug email sending Determines whether or not to enable verbose debug information during sending of email messages to SMTP server. Performance info The Performance info option determines whether performance info will be included in the footer of the standard theme (and some other themes). Performance info includes the time for the page to load, the amount of memory used to generate the page, cpu usage, load, and the record cache hit/miss ration. If you add define('MDL_PERF', true); define('MDL_PERFDB', true); define('MDL_PERFTOLOG', true); define('MDL_PERFTOFOOT', true); to your config.php file, then it will also count database queries. (This has to be in config.php, because Moodle starts doing DB queries before it loads the config information in the database!