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18/09/2007, 02h53

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.

18/09/2007, 02h53	#2
ljb Messages: n/a Hébergeur:	Re: diff between $x == null and is_null($x) 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.