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Displaying errors to the screen during
development is just the first step.

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The developer won't always run
across every possible error.

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And what about errors that
happen in production?

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That's where logging comes in.

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Like other error settings,

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ideally your logging should
be set in your php.ini file.

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However, you can change these
settings with the htaccess file or,

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in a specific PHP file as well.

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Although this is not ideal,
you can use the ini_set function

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in your PHP file to set the configuration
option for logging errors.

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It's not an ideal solution,
because it will not log any

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errors if the script has parse errors and
cannot be run at all.

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Let's see this in action.

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I've turned errors back
on in the .htaccess file.

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Open logging.php.

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At the top of the file we have some log
options using the ini_set functions.

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log_errors is set to 1.

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And error_log is set to php-error.txt.

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I'm using .txt for error_log so
we can view this file in workspaces.

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When we view this script in a browser,
we can see our parse error, but

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when we go back to work spaces
we don't have any error logs.

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That's because parse errors won't work.

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PHP will never read this line that
tells it where error log should be.

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If we fix the parse error but
leave a syntax error,

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you'll see the error logs on
the screen and also written to our log.

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Let's fix the parse error but
leave the syntax error.

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Now when we preview it in the browser,
we see an error on the screen.

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It should also write to our error log.

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Great.

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The notice and
the warning are in our error log.

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If we don't have access
to the php.ini file,

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the next best option is
usually the htaccess file.

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This is a better option because
it will log the errors,

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even if there's a parse
error in your script.

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Let's put our parse error back in,
then modify our htaccess file.

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We want to turn on log errors.

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We use php_value

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log_errors 1.

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We also need our log file for errors.

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php_value error_log

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php-error.txt.

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Let's rename our file again.

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And now when we preview the browser,
we see our parse error.

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And if we go back to our PHP errors, we
now see our parse error is logged as well.

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This by no means covers
error handling completely.

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I trust that it's given you enough
to get you started with this

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important part of development.

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You should now know how to display and
log errors.

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Proper error handling makes it
easier to track down errors and

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get your code up and running.

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I've included more information
on error and exception handling.

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As well as debugging in
the teacher's notes.

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Have fun and keep learning.