Debugging Php Error

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Remote Debugging Php

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Debugging Php In Eclipse

other. Join them; it only takes a minute: Sign up How to get useful error messages in PHP? up vote 367 down vote favorite 163 I find programming in PHP quite frustrating. Quite often I will try and run

Debugging Php In Chrome

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 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 debugging php applications 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 3,66183982 asked May 10 '09 at 9:48 Candidasa 2,94482330 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 351 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 can't modify the php.ini, you can also add the following lines to an .htaccess file: php_flag display_errors on php_value error_reporting 2039 You may want to consider using the value of E_ALL (as mentioned by Gumbo) for your version of PHP for error_reporting to get all of the errors. more info 3 other

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Generators References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Context options and parameters Supported Protocols http://php.net/manual/en/function.error-reporting.php and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error http://jason.pureconcepts.net/2013/04/common-debugging-php-mysql/ Reporting Using Register Globals User Submitted Data Magic Quotes Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with debugging php XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Safe Mode Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Credit Card Processing Cryptography Extensions debugging php in Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation Keyboard Shortcuts? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto search(current page) / Focus search box restore_error_handler » « error_log PHP Manual Function Reference Affecting PHP's Behaviour Error Handling Error Handling Functions Change language: English Brazilian Portuguese Chinese (Simplified) French German Japanese Korean Romanian Russian

I see many questions on StackOverflow about database issues. This post aims to provide a checklist to help diagnose common issues. While this post contains PHP and MySQL code samples, this debugging checklist applies to other database platforms. First, debugging is hard. Especially debugging database issues. Often times the best approach is to systematically rule out what cannot be the problem. This checklist adopts such an approach from a low to high level. Can you connect to the database outside your application? Verify you can connect to your database by logging into MySQL from the command line. mysql -u dbuser -p -h localhost database If you have a specific database user for your application, be sure to verify their credentials as well. If you do not have command line access, you can use another database administration tool (e.g. PHPMyAdmin). If you cannot connect to the database, you need to start at the beginning: Ensure MySQL is running, your database exists, and your credentials are correct. Can you connect to the database inside your application? Verify you can connect to the database from PHP. Test with a separate script to also rule out bugs in your codebase: query($sql)) { echo 'Error: ', $mysqli->error; } In this case, we’d see that $bad_var is not set. As such, the query becomes: SELECT column FROM table WHERE column = Note: This code above is a contrived example of a dynamic query. If you do not see what else is wrong with this query, please read about SQL injectio