Where does PHP store the error log? (php5, apache, fastcgi, cpanel)

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 file you're probably looking for is stored (by default) at

/usr/local/apache/logs/error_log

If all else fails you can check the location of the log file using

<?php phpinfo(); ?>

Try phpinfo() and check for "error_log"

Linux

php --info | grep error 

The terminal will output the error log location.

Windows

php --info | findstr /r /c:"error_log"

The command prompt will output the error log location

To set the log location

Open your php.ini and add the following line:

error_log = /log/myCustomLog.log

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_{Thanks @chelmertez, @Boom for these (comments on the question).}