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Posted by ljb on 09/18/07 00:53
doannoahlot@dis.org wrote:
> Is there a meaningful/usefull difference
> between $x == null and is_null($x)?
Yes there is.
is_null($x) is the same as $x === NULL (3 equal signs for strict
compare). But $x == NULL (2 equal signs for loose compare) is also
true if $x is 0, FALSE, empty string, or empty array. is_null() is false
for all those.
See the Appendix R "PHP Type Comparison Tables" of the PHP manual.
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