note 70814 added to tutorial.useful

I'm a Java programmer looking at learning PHP, and I noticed
that although the tutorial used !==, with two equals signs
to indicate 'does not equal', I had instinctively used !=,
with only one equals sign.  This didn't make a difference to
my code, though.  Is there a difference?  If so, what is it?
 I think this would be worth mentioning in the tutorial, as
it has me wondering, and likely will be on the minds of
others reading it.
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Probable Submitter: 62.136.175.155
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Manual Page -- http
://www.php.net/manual/en/tutorial.useful.php
Edit        -- https://master
.php.net/note/edit/70814
Del: integrated  -- h
ttps://master.php.net/note/delete/70814/integrated
Del: useless     -- http
s://master.php.net/note/delete/70814/useless
Del: bad code    -- htt
ps://master.php.net/note/delete/70814/bad+code
Del: spam        -- https:/
/master.php.net/note/delete/70814/spam
Del: non-english -- 
https://master.php.net/note/delete/70814/non-english
Del: in docs     -- http
s://master.php.net/note/delete/70814/in+docs
Del: other reasons-- https://mast
er.php.net/note/delete/70814
Reject      -- https://mast
er.php.net/note/reject/70814
Search      -- https://
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Note Submitter: Druadan 

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I'm a Java programmer looking at learning PHP, and I noticed
that although the tutorial used !==, with two equals signs
to indicate 'does not equal', I had instinctively used !=,
with only one equals sign.  This didn't make a difference to
my code, though.  Is there a difference?  If so, what is it?
 I think this would be worth mentioning in the tutorial, as
it has me wondering, and likely will be on the minds of
others reading it.

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