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Handling Uncaught Exceptions
2:54Sometimes you're unable to catch every exception, but you want to make sure nothing important gets missed. PHP provides a way to handle these exceptions, by setting a default exception handler.
It's best to catch and
handle as many exceptions as possible
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as soon as they happen,
rather than leaving them to bubble up.
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As it enhances the user experience and
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reduces the likelihood that they will
break your application in some way.
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Half writing a file for example.
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However, sometimes exceptions happen
when we're not expecting them.
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They are exceptions after all.
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Especially now that we've
turned errors into exceptions.
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Once again, PHP provides a way
to handle these exceptions,
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by setting a default exception handler.
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Let's go back into Work Spaces and
set one up.
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Let's add another expression
that will cause an exception.
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Echo 10/0 then let's refresh the browser.
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We no longer see our end of file
because this new exception is
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not caught in handled, so
execution of the script stops there.
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Let's add the default exception handler.
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Setting up a default exception handler is
much like setting up an error handler.
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Use the set, exception, handler.
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And pass in the function you want to use.
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Exception_handler.
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Then we add the new
exception_handler function.
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This function needs to accept one
parameter, the exception thrown.
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Just like with any other caught exception,
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we can now do any
exception handling we want.
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Let's just echo, uncaught exception,
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And then our getMessage.
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Now let's refresh the page.
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This time we see that the exception
handler did catch the error.
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But it did not allow the script
to continue processing.
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That's how the uncaught
exception handler works.
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So it's a good idea to
catch exceptions and
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not rely on the default exception handler.
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Make sure you check the notes associated
with this video for further resources.
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>> We've covered everything you
need to know to get started
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implementing exception handling in
your object oriented application.
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Throwing and catching exceptions
gives you robust control
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of your application when
something goes wrong.
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By turning PHP errors into exceptions
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you improve communication throughout
all parts of your application.
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Start using exception handling
when accepting data or
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communicating with an external source.
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Until next time.
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Have fun and keep learning.
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