Hence, in dev mode, you can easily log errors in php with errorlog function, which sends an error message to the defined error handling routines. lets suppose you are connecting mysql database with php and if it fails to connect with it, you can log errors in php like this
in php, errors and warnings can be logged into a file by using a php script and changing configuration of php.ini file. two such approaches are mentioned below approach 1 the errorlog function can be used to send error messages to a given file. first argument to the function is the error message to be sent.
the errorlog function sends an error message to a log, to a file, or to a mail account.
using both errorlog and tail to view the phperror.log you can debug code without having to worry so much about printing debug messages to the screen and ho they might be seen by. further note this works even better when you have two monitors setup. one for your browser and ide and the other for viewing the log files update live as you go.
if you have build apache and php from source, then the error logs by default is generated at your apache install dirlogserrorlog i.e generally usrlocalapache2logserrorlog. else, if you have installed it from repository, you will find it at varlogapache2errorlog .you can set the path in your php.ini also and verify it by invoking phpinfo .
log php errors to a file using the errorlog function during production, error messages must not be shown to the end users, but this information must still be recorded for tracing purposes. the best way to record these error messages on a production web application is to store it in log files.

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