Php Error Warning Division By Zero In
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Php Suppress Division By Zero Warning
down vote favorite I'm learning php and built an experimental form-based calculator (also using html & POST method) that returns values to a table. The calculator is functional when I enter my values and click submit, but I keep getting two "Division by zero" errors on the last line when I first run the code. I can't seem seem to find a logical solution or explanations when searching warning division by zero wordpress here or via Google. Any explanation you can provide to a newb will be appreciated. php divide-by-zero share|improve this question asked Aug 23 '13 at 17:34 Chip 1451210 3 could you post the relevant code? –Emilio Gort Aug 23 '13 at 17:34 3 Why are you doing + null? And do all variables have a value? –putvande Aug 23 '13 at 17:35 2 @Chip - can you also add in a var_dump($_POST) so we can see what the incoming variables are? –andrewsi Aug 23 '13 at 17:38 1 "errors on the last line when I first run the code". This code won't work unless something is posted to it. You need to check if(isset($_POST['num1'])). –Rocket Hazmat Aug 23 '13 at 17:38 1 @Sumurai8: var_dump doesn't return anything, it echos for you. You don't need the echo there. –Rocket Hazmat Aug 23 '13 at 17:39 | show 8 more comments 7 Ans
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Php Ignore Division By Zero
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Warning Division By Zero In Woocommerce
it only takes a minute: Sign up PHP, How to catch a division by zero? up vote 18 down vote favorite 2 I have a large mathematical expression that has to be created dynamically. For example, once I have parsed http://stackoverflow.com/questions/18408640/php-warning-division-by-zero "something" the result will be a string like: "$foo+$bar/$baz";. So, for calculating the result of that expression I'm using the eval function... something like this: eval("\$result = $expresion;"); echo "The result is: $result"; The problem here is that sometimes I get errors that says there was a division by zero, and I don't know how to catch that Exception. I have tried things like: eval("try{\$result = $expresion;}catch(Exception \$e){\$result = 0;}"); echo "The result is: $result"; Or: try{ eval("\$result = $expresion;"); http://stackoverflow.com/questions/3071067/php-how-to-catch-a-division-by-zero } catch(Exception $e){ $result = 0; } echo "The result is: $result"; But it does not work. So, how can I avoid that my application crashes when there is a division by zero? Edit: First, I want to clarify something: the expression is built dynamically, so I can't just eval if the denominator is zero. So... with regards to the Mark Baker's comment, let me give you an example. My parser could build something like this: "$foo + $bar * ( $baz / ( $foz - $bak ) )" The parser build the string step by step without worrying about the value of the vars... so in this case if $foz == $bak there's in fact a division by zero: $baz / ( 0 ). On the other hand as Pete suggested, I tried: But it does not print anything. php exception divide-by-zero share|improve this question edited Mar 13 '14 at 19:01 Eric Leschinski 47.1k23221191 asked Jun 18 '10 at 15:41 Cristian 138k44300237 1 Can you check if $expression is dividing by zero beforehand? –Anthony Forloney Jun 18 '10 at 15:44 @Anthony Forloney: Good question, my answer assumed you could, but if Cristian is really using eval for this, then the answer is probably "no." –Powerlord Jun 18 '10 at
dividing with has been set to zero (this number is called the divisor).The variable you're dividing with has been set to null.The variable does not exist. http://thisinterestsme.com/php-warning-division-zero/ i.e. It has not been set.Example code that will reproduce the https://pear.php.net/bugs/12650 error:PHP $var = 0; echo 12 / $var;12$var = 0;echo 12 / $var;If you run the code above, you'll be faced with the following error: Warning: Division by zero. This is because our variable $var has been set to 0.Fortunately, this common warning can be avoided division by by carrying out some very basic checking. To avoid this type of error, you can wrap your division arithmetic inside an IF statement, like so:PHP $var = 0; if($var > 0){ echo 12 / $var; }1234$var = 0;if($var > 0){echo 12 / $var;}The code above is pretty simple. Basically, we make sure that the variable (in this division by zero case, our divisor) is greater than 0 before we attempt our division calculation.PS: It is important to note that this will not prevent your script from executing. In other languages, division by zero can lead to an exception that essentially kills the program. Comments comments3SHARESFacebookTwitterRelated posts:Slow MySQLi connection Creating a "what's hot" algorithm with PHP and MySQL PHP: Error handling with cURL Avoiding undefined index / offset errors in PHP This entry was posted in Code, PHP Tutorials by ThisInterestsMe. Post navigation ← Parking The Bus - Mourinho FIFA 15 Tactics Searching between dates in MySQL. → Search Search for: Recent Posts How to set the cruise control on a Vauxhall / Opel Insignia. PHP: Cache SQL results on file system. Convert EURO to GBP (Sterling) using PHP Move a file with PHP. PHP: Get last day of month. MySQL: SELECT all records from today using PHP. CategoriesAbandoned WebsitesCall of DutyCodeData DownloadsDayZFantasy FootballFootballFunnyGamingIrelandJavaScriptMySQLNostalgiaPeople of the InternetPHP TutorialsProgramming HumorRantSEO / WebmasterTips & TricksTwitter TrendsUncategorizedVideosWexfordWexford News Toolbox Premier League Fixtures Difficulty
Bug Statistics Package home|Report new bug|New search|Development Roadmap Status: Open|Feedback|All|Closed Since Version 1.0.3 Bug#12650 Prevent Division by zero warning/errors Submitted: 2007-12-10 07:44 UTC From: ctj951 Assigned: kguest Status: Closed Package: Crypt_RC4 (version 1.0.2) PHP Version: 4.4.7 OS: Mac OS X 10.4 Roadmaps: (Not assigned) Subscription Your email: Comments Add Comment Add patch [2007-12-10 07:44 UTC] ctj951 (Chad Jones)Description: ------------ I took the RC4 script I just downloaded and added the code suggested in the package itself. After running I get a lot of messages like the following: Warning: Division by zero in /Users/ctj951/Desktop/Crypt_RC4-1.0.2/Crypt_RC4-1.0.2/Rc4.php on line 103 The script still seems to work and seems to print the correct result. But I get tons of these messages. WHY? How can this be fixed? Is there something wrong with the program? Why are we dividing by zero? I hope this isn't considered "normal" behavior. Other then that the script "seems" to work. Test script: --------------- I add the code below (the exact code suggested in the package itself) to the bottom file and ran the complete PHP file $key = "pear"; $message = "PEAR rulez!"; $rc4 = new Crypt_RC4; $rc4->key($key); echo "Original message: $message
\n"; $rc4->crypt($message); echo "Encrypted message: $message
\n"; $rc4->decrypt($message); echo "Decrypted message: $message
\n"; Expected result: ---------------- No divide by zero warnings Actual result: -------------- Here is the output after running: %php Rc4.php --- Original message: PEAR rulez!
**following line is printed exactly 256 times: Warning: Division by zero in ~/Desktop/Crypt_RC4-1.0.2/Crypt_RC4-1.0.2/Rc4.php on line 103 Encrypted message: ?]??E(V?|?
**following line is printed exactly 256 times: Warning: D