How does php generate the download list of the year, month and day

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The specific implementation methods are as follows:

Function mdy ($mid = "month", $did = "day", $yid = "year", $mval, $dval, $yval) {if (empty ($mval)) $mval = date ("m"); if (empty ($dval)) $dval = date ("d"); if (empty ($yval)) $yval = date ("Y") $months = array (1 = > "January", 2 = > "February", 3 = > "March", 4 = > "April", 5 = > "May", 6 = > "June", 7 = > "July", 8 = > "August", 9 = > "September", 10 = > "October", 11 = > "November", 12 = > "December"); $out = ""; foreach ($months as $val = > $text) if ($val = $mval) $out. = "$text"; else $out. = "$text"; $out. = " $out. = ""; for ($I = 1; $I