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number_format() returns a formatted version of number. this function accepts either one, two or four parameters (not three):
this function accepts either one, two or four parameters (not three):

fsockopen() accepts two, three, four, or five parameters. after the obligatory variable declarations, the function checks for the correct range of arguments. then it uses a fall-through mechanism in a switch() statement to deal with all arguments. the switch() statement starts with the maximum number of arguments being passed (five). after that, it automatically processes the case of four arguments being passed, then three, by omitting the otherwise obligatory break keyword in all stages. after having processed the last case, it exits the switch() statement and does the minimal argument processing needed if the function is invoked with only two arguments.
after having processed the last case, it exits the switch() statement and does the minimal argument processing needed if the function is invoked with only two arguments.