php - Why do some array parameters have a comma after opening parentheses? -


what syntax i've seen documentations applying, example:

jquery sizzle

sizzle( string selector[, domnode context[, array results]] )

codeiginiter 3

set_userdata($data[, $value = null])

basically, means, parameters inside [] optional. dont need pass in order make function call work:

foo($param [, $param2 = null, $param3 = 1])

$param1 , $param2 optional, $param mandatory.


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