Error Trapping In Php
Contents |
Errors Exceptions Generators References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Context options and parameters Supported Protocols and php try catch Wrappers Security Introduction General considerations Installed as CGI binary php error handling Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting Using Register php error reporting Globals User Submitted Data Magic Quotes Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using mysql error trapping 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 Database Extensions Date and Time Related Extensions File System
Perl Error Trapping
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 Introduction » « blenc_encrypt PHP Manual Function Reference Affecting PHP's Behaviour Change language: English Brazilian Portuguese Chinese (Simplified) French German Japanese Korean Romanian Russian Spanish Turkish Other Edit Report a Bug Error Handling and Logging IntroductionInstalling/ConfiguringRequirementsInstallationRuntime ConfigurationResource TypesPredefined ConstantsExamplesError Handling Functionsdebug_backtrace — Generates a backtracedebug_print_backtrace — Prints a backtraceerror_clear_last â€
Errors Exceptions Generators References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as
Python Error Trapping
CGI binary Installed as an Apache module Session Security Filesystem Security Database sql error trapping Security Error Reporting Using Register Globals User Submitted Data Magic Quotes Hiding PHP Keeping Current Features HTTP php fatal error uncaught exception authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Safe Mode Command line usage Garbage Collection DTrace Dynamic http://php.net/manual/en/book.errorfunc.php 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 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 http://php.net/manual/en/ref.errorfunc.php 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 debug_backtrace » « Examples PHP Manual Function Reference Affecting PHP's Behaviour Error Handling Change language: English Brazilian Portuguese Chinese (Simplified) French German Japanese Korean Romanian Russian Spanish Turkish Other Edit Report a Bug Error Handling Functions See Also See also syslog(). Table of Contentsdebug_backtrace — Generates a backtracedebug_print_backtrace — Prints a backtraceerror_clear_last — Clear the most recent errorerror_get_last — Get the last occurred errorerror_log — Send an error message to the defined error handling routineserror_reporting — Sets which PHP errors are reportedrestore_error_handler — Restores the previous error handler functionrestore_exception_handler — Restores the previously defined exception handler function
Errors Exceptions Generators References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Context options and parameters Supported Protocols http://php.net/manual/en/function.set-error-handler.php and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting Using Register http://stackoverflow.com/questions/11894115/best-way-to-handle-errors-on-a-php-page Globals User Submitted Data Magic Quotes Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using error trapping 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 Database Extensions Date and Time Related Extensions File sql error trapping 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 set_exception_handler » « restore_exception_handler 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 Spanish Turkish Other Edit Report a Bug set_error_handler (PHP 4 >= 4.0.1, PHP 5, PHP 7)set_error_handler — Sets a user-defi
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 about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Best way to handle errors on a php page? up vote 33 down vote favorite 19 Right now my pages look something like this: if($_GET['something'] == 'somevalue') { $output .= 'somecode'; // make a DB query, fetch a row //... $row = $stmt->Fetch(PDO::ASSOC); if($row != null) { $output .= 'morecode'; if(somethingIsOK()) { $output .= 'yet more page output'; } else { $error = 'something is most definitely not OK.'; } } else { $error = 'the row does not exist.'; } } else { $error = 'something is not a valid value'; } if($error == '') // no error { //display $output on page } else // an error { // display whatever error occurred on the page } The way I'm doing things works, but it's very cumbersome and tedious for what is probably obvious: suppose that I call a function somewhere in the middle of my code, or want to check the value of a variable, or verify a DB query returned a valid result, and if it fails I want to output an error? I would have to make another if/else block and move all of the code inside the new if block. This doesn't seem like a smart way of doing things. I have been reading about try/catch and have been thinking of putting all of my code inside a try statement, then let the code run sequentially without any if/else blocks and if something fails just throw an exception. From what I've read, that would halt the execution and make it jump straight to the catch block (just as a failed if statement will go to the else block), where I could then output the error message. But is that an acceptable or standard practice? What's the best way of handling errors, fatal or not, in a php application that builds and outputs an HTML page? I don't want to just die with a blank screen, as that would be very user un-friendly, but instead want to output a message in the body of the page, still allowing the header and footer to show. Thanks for your advice! php exception exception-handling error-handling try-catch share|improve this question edited Aug 12 '12 at 2:18 asked Aug 10 '12 at 1:02 Nat