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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 php iis error log minute: Sign up How to print a debug log? up vote 57 down vote favorite 18 I'd like to debug this code but I guess "printing a log to screen or file" is fine for me. How should I print http://www.w3schools.com/php/func_error_log.asp a log in php code? The usual print/printf seems to go to HTML output not the console. I have apache server executing the PHP code. php debugging logging share|improve this question edited Jun 29 '14 at 15:34 Martin Thoma 14.5k17118234 asked May 21 '11 at 3:51 eugene 8,2471993202 Is your script running in a web browser or in a console (aka parsed using php.exe rather than apache/iis)? –danielrsmith May 21 '11 at 3:56 You should look at this http://stackoverflow.com/questions/6079492/how-to-print-a-debug-log question, has a bit of useful logging code: stackoverflow.com/questions/5769537/… –Ben May 21 '11 at 3:57 you can use echo $variable –Ibu May 21 '11 at 3:59 what language are you comming from? Just so you php is very different then other compiled languages –Ibu May 21 '11 at 4:02 1 @lbu: indeed.. I didn't expect, printf question would get this many upvotes... –eugene Oct 24 '14 at 12:44 add a comment| 14 Answers 14 active oldest votes up vote 103 down vote accepted A lesser known trick is that mod_php maps stderr to the Apache log. And, there is a stream for that, so file_put_contents('php://stderr', print_r($foo, TRUE)) will nicely dump the value of $foo into the Apache error log. share|improve this answer answered May 21 '11 at 4:17 chx 6,77532464 3 +1: Was completely unaware of that. Nice :) –Demian Brecht May 21 '11 at 4:30 + oned for mentionning that, btw you can also set the value of error_log to 'php://stdout' when debugging a console app and have the error messages appear straight to console, ie: error_log("You messed up!", 3, "php://stdout"); –stefgosselin May 21 '11 at 12:38 can I print a formatted string? –eugene May 23 '11 at 7:31 +1: what they said. –PapaFreud Feb 29 '12 at 9:00 2 +1 It took me too long to find this answer. This is all I really was looking for. I couldn
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 http://stackoverflow.com/questions/5127838/where-does-php-store-the-error-log-php5-apache-fastcgi-cpanel site About Us Learn more about Stack Overflow the company Business Learn more http://stackoverflow.com/questions/3531703/how-to-log-errors-and-warnings-into-a-file 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 Where does error log PHP store the error log? (php5, apache, fastcgi, cpanel) up vote 202 down vote favorite 45 I am on shared hosting and have Cpanel, Apache, PHP is run by fastcgi. Where does PHP store the error log? Is there any other way I can find the error log on shared hosting environment instead of having to go through entire site structure to look for php error log error_log files? I have access to the php.ini (I am using PHP version 5.2.16). error-handling php share|improve this question edited Aug 24 '15 at 9:33 n611x007 3,11522642 asked Feb 26 '11 at 15:43 PHPLOVER 1,961102945 8 On Linux, either /var/log/httpd/error_log or /var/log/apache2/error.log. These files are owned by root, so you need to be root or use sudo to see it, or read it. –Eric Leschinski Aug 7 '14 at 19:49 47 php --info | grep error –sjas Aug 27 '14 at 13:21 1 @sjas -- genius! –the0ther Feb 21 '15 at 20:02 3 For those looking for a Windows solution, use php --info | findstr /r /c:"error_log" to see where the log file is. –Boom May 13 '15 at 17:00 add a comment| 14 Answers 14 active oldest votes up vote 156 down vote accepted Php stores error logs in /var/log/apache2 if php is an apache2 module. Shared hosts are often storing log files in your root directory /log subfolder. But...if you have access to a php.ini file you can do this: error_log = /var/log/php-scripts.log According to rinogo's comment: If you're using cPanel, the master log
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 How to log errors and warnings into a file? up vote 116 down vote favorite 33 How to turn on all error and warnings and log them to a file but to set up all of that within the script (not changing anything in php.ini). I want to define a file name and so that all errors and warnings get logged into it. php error-handling share|improve this question asked Aug 20 '10 at 14:15 Gorep 584253 add a comment| 5 Answers 5 active oldest votes up vote 199 down vote Use the following code: ini_set("log_errors", 1); ini_set("error_log", "/tmp/php-error.log"); error_log( "Hello, errors!" ); Then watch the file: tail -f /tmp/php-error.log Or update php.ini as described in this blog entry from 2008. share|improve this answer edited Apr 7 '13 at 5:35 Dave Jarvis 16.4k24105204 answered Aug 20 '10 at 14:32 Aman 2,4131815 30 ini_set does only work if that code is executed. Not useful for code that has parse errors because the error will be before the code is executed. Instead write those changes into the php.ini. –hakre Apr 16 '13 at 23:31 7 If you can't edit php.ini, you should be able to add this in the .htaccess : php_flag log_errors on php_value error_log /home/path/public_html/domain/PHP_errors.log. See perishablepress.com/… –Matthieu Jan 8 '14 at 8:47 I have a question, how to get the error.log file to get created in my htdocs folder instead? –Tommy Mar 5 '14 at 21:51 I guess you just change the folder from tmp/php-error.log to which ever location you desire? –Luke Apr 16 '14 at 12:37 This crashes my PHP in 5.4.0 –Supuhstar May 10 '14 at 3:05 | show 1 more comment up vote 53 down vote See error_log — Send an error message somewhere Example error_log("You messed up!", 3, "/var/tmp/my-errors.log"); You can customize error handling with your own error handlers to call this function for you whenever an error or warning or whatever you need to log occurs. For additional information, please refer to the Chapter Error Handling in the PHP Manual s