Php > HTML and Php

This PHP function creates dropdown select lists for time and date that you can

This PHP function creates dropdown select lists for time and date that you can
change, outputs a 14 char MySQL timestamp in a text field

Enjoy this - I'm sure it could be more elegant, but I couldn't find something like this anywhere 
else. Pull your hair out on more important programming problems! If you like it, or improve 
upon it, drop me a line. 

call the function like this: 
<?PHP 
stamper($previous_value); 
?> 



<?PHP 
function stamper($previous_value) { 

// your constants 
$form_name = "form1"; 
$store_stamp_field = "datestamp"; 

// looks for previous 14 char stamp or defaults to now 
if (!$previous_value) { 
$my_stamp = date("YmdHis"); 
} else { 
$my_stamp = $previous_value; 
} 

// parses the timestamp & digests it into useful variables 
$year=substr($my_stamp,0,4); 
$month=substr($my_stamp,4,2); 
$day=substr($my_stamp,6,2); 
$hour=substr($my_stamp,8,2); 
$minute=substr($my_stamp,10,2); 
$second=substr($my_stamp,12,2); 

// here you can set your ("starting value", "range") for each 
$year_range = array("2000","11"); 
$month_range = array("01","12"); 
$day_range = array("01","31"); 
$hour_range = array("00","24"); 
$minute_range = array("00","60"); 
$second_range = array("00","60"); 
$names = array("month","day","year","hour","minute","second"); 
$names_for_stamp = array("year","month","day","hour","minute","second"); 


// this drops in some javascript to do the onChange event handler for each select list 
echo "<script language=\"JavaScript\">\n"; 
echo "function adj_timestamp () {\n"; 
echo "var each_field = new Array(" . count($names) . ");\n"; 
for ($i=0;$i<count($names);$i++) { 
echo "each_field[" . $i . "] = document." . $form_name . "." . $names_for_stamp[$i] . ".options 
[document." . $form_name . "." . $names_for_stamp[$i] . ".selectedIndex].value;"; 
} 
echo "var timestamp = "; 
for ($i=0;$i<count($names);$i++) { 
if ($i!=(count($names)-1)) { 
echo "each_field[" . $i . "] + "; 
} else { 
echo "each_field[" . $i . "];\n"; 
} 
} 
echo "document." . $form_name . "." . $store_stamp_field . ".value = timestamp;\n"; 
echo "}\n"; 
echo "</script>\n"; 

// this creates the selects and add the JS event handler 
for ($i=0;$i<count($names);$i++) { 
echo "<select name=\"$names[$i]\" onChange=\"adj_timestamp();\">\n"; 
$this_one = ${"$names[$i]" . "_range"}; 
for ($k=0;$k<$this_one[1];$k++) { 
$each_val = $this_one[0]+$k; 
if (strlen($each_val)<2) { 
$each_val = sprintf("%02d", $each_val); 
} 
if (${"$names[$i]"}==$each_val) { 
$selected=" selected"; 
} else { 
$selected=""; 
} 
echo "<option value=\"$each_val\"$selected>$each_val</option>\n"; 
} 
echo "</select>\n"; 
} 

//this creates the initial timestamp 
$the_stamp = $year . $month . $day . $hour . $minute . $second; 

//this holds the dynamic timestamp value, make it hidden once you get the hang of how it all 
works 
echo "<input type=\"text\" name=\"$store_stamp_field\" value=\"$the_stamp\">\n"; 
} 
?>