What does PHP mean? Solution

What does PHP mean! $ Status & amp; $ status = $ pm ['msgtoid'] & amp; $ pm ['new']; what does PHP mean ,! $ Status & amp; $ status What does PHP mean?
! $ Status & $ status = $ pm ['msgtoid'] & $ pm ['new'];

What does PHP mean?

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! $ Status & $ status = $ pm ['msgtoid'] & $ pm ['new'];

If! $ Status = 1 (that is, $ status = 0)
And $ status = $ pm ['msgtoid'] (the value of $ status after the assignment is not 0)
And $ pm ['new'] is not 0

So .....
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! $ Status & $ status = $ pm ['msgtoid'] & $ pm ['new'];
! $ Status returns a BOOL value, indicating that the value is not $ status
The subsequent value assignment is performed only when the value of not $ status is true.
$ Status = $ pm ['msgtoid'] & $ pm ['new'];
$ Pm ['msgtoid'] & $ pm ['new'] returns BOOL values.
True is returned only when $ pm ['msgtoid'] and $ pm ['new'] are not empty, not 0, not false, or NULL.
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! $ Status & $ status = $ pm ['msgtoid'] & $ pm ['new'];
Operation sequence:
(! $ Status) & ($ status = $ pm ['msgtoid'] & $ pm ['new']);
Equal (! $ Status) & $ pm ['msgtoid'] & $ pm ['new'];
In this case, the calculation result of $ pm ['msgtoid'] & $ pm ['new'] is assigned to $ status, which may be used by the following program or may cause a problem.