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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 http://stackoverflow.com/questions/11894115/best-way-to-handle-errors-on-a-php-page 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 http://nyphp.org/PHundamentals/7_PHP-Error-Handling handle errors on a php page? up vote 32 down vote favorite 18 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) error handling { $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 $output on page } else // an error { // display whatever error occurred on the page } The way I'm doing things works, but it's very cumbersome and tedious for what php error handling is probably obvious: suppose that I call a function somewhere in the middle of my code, or want to check the value of a variable, or verify a DB query returned a valid result, and if it fails I want to output an error? I would have to make another if/else block and move all of the code inside the new if block. This doesn't seem like a smart way of doing things. I have been reading about try/catch and have been thinking of putting all of my code inside a try statement, then let the code run sequentially without any if/else blocks and if something fails just throw an exception. From what I've read, that would halt the execution and make it jump straight to the catch block (just as a failed if statement will go to the else block), where I could then output the error message. But is that an acceptable or standard practice? What's the best way of handling errors, fatal or not, in a php application that builds and outputs an HTML page? I don't want to just die with a blank screen, as that would be very user un-friendly, but instead want to output a message in the body of the page, still allowing the header and footer to show. Thanks for your advice! php exception exception-handling error-handling try-catch share|improve this question edited Aug 12 '12 at 2:18 asked Aug 10 '12 at 1:02 Nate 5,1961354122 I use exit($error) myself, like: if($some_error == TRUE){exit('Error.');}Hopefully it's not a bad practice
the NYPHP flickr Group. Link up with NYPHP at the PHP LinkedIn Group. About NYPHP » Charter » Mission » What is NYPHP? » Principals » Sponsors PHP Error Handling NYPHP - PHundamentals PROBLEM: Every well-constructed PHP application should have error handling. While there is no definitive method for handling errors since it varies depending on application needs and a developer's style, nonetheless, there are some "best practices" that should be implemented in all PHP applications. WHAT IS AN ERROR? The answer may seem straightforward but actually requires a bit of discussion. An "error" is an expected or unexpected event that occurs when your PHP code is running. An "expected" error can be a database query that returns no result or an html form that is missing values for designated required fields. An "unexpected" error is one that assumes a particular application state which, for some as yet unknown reason, does not exist. The most obvious unexpected error is a database that is not running or a missing file that one of your scripts expects to find. ERROR HANDLING ENVIRONMENT The recommended "best practice" has three parts: The developer should be alerted to all errors, notices, warnings, etc. both during development and when the PHP application goes into production. The developer should be able to choose how to be notified of these problems. No errors, notices, warnings, etc. should ever be displayed to the user. Even in development, errors dumped to the browser can be bad because they can become hidden in the HTML. In production, you should display a generic page that says "System down for maintenance" or some other generic message. At no time do you want to tip off a hacker as to what went wrong, nor do you want to display the details of what went wrong. That information is for you alone. Although some developers feel that errors should be displayed during development and even in a production environment - modified, of course, so as not to tip off a hacker - we will assume here that errors will never be displayed. We can set these three parameters in one of two ways. If you have control over the php.ini file then set the following parameters: (See Note 1)