# Are there any functions that the php function does not support?
The functions that the php function does not support include [variable number of parameters]
The number of parameters of the php function must be determined. Of course, when you quote the function, if there is The parameters have default values. You don’t need to write them
function test($a,$b=array()){ }
when you quote them, you can
test('1',array(1,2,3));
or
test('1');
, but in fact, the number of function parameters of test It’s for sure
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