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Iterating
Listing Links
Date Pull-down Menu

Iterating Over an Array

<?php

// this is a basic array
$lab_members = array("Lisa D", "Ben", "Claire", "Lisa W");
foreach($lab_members as $person) {
	echo "<p>$person is in the Face Research Lab</p>";
}

// this is an associative array
$lab_members = array(
	"Lisa D"	=> "http://abdn.ac.uk/debruine/",
	"Ben"		=> "http://abdn.ac.uk/bcjones/", 
	"Claire"	=> "http://abdn.ac.uk/~psy410/php_practice/", 
	"Lisa W"	=> "http://abdn.ac.uk/~psy449/php_practice/"
);
foreach($lab_members as $webpage => $person) {
	echo "<p><a href='$webpage'>$person</a> is in the Face Research Lab</p>";
}
	
?>

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A Function For Listing Links

<?php

function listLinks($linkArray, $listtype="ul") {
	/* do nothing and return if 
	 * the argument is not in array format
	 */
	 
	if (!is_array($linkArray)) { return false; }
	
	// the list type defaults to ul
	$list = "<$listtype>\n";
	
	foreach($linkArray as $url => $text_to_link) {
		$list .= "<li><a href='$url'>$text_to_link</a></li>\n";
	}
	$list .= sprintf("</%s>\n", substr($listtype, 0, 2));
	
	return $list;
}

$my_links = array(
	"http://www.facelab.org" => "The Face Research Lab",
	"http://www.faceresearch.org" => "FaceResearch.org Experiments"
);

echo listLinks($my_links, "ol");
	
?>

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A Function for a Date Pull-down Menu in a Questionnaire

<?php

/* this makes the options part of a drop-down menu 
 * with numbers from $start to $end
 * $default is optional. if set, 
 * it displays that number instead of a blank to start
 */
 
function numberList($start, $end, $default="")  {
	$increment = ($start < $end) ? 1 :  -1;

	for ($i = $start; $i <> $end; $i +=  $increment) {
		$selected =  ($i == $default) ? " selected='selected'" :  "";
		echo "         <option  value='$i'$selected>$i</option>\n";
	}
}

/*  drop-down menu with date
 * $display is optional. 
 * It takes a 3-item array  of true or false and
 * determines if the day, month, and year can be  seen
 */
 
function dateQuest($question, $name, $startyear, $endyear, $display  =
array(true, true, true)) {

	echo " <tr>\n";
	echo "  <td> $question  </td>\n";

	echo "  <td>\n";

	//  day selector (1-31)
	if ($display[0])  {
		echo "   <select  name='{$name}_day'>\n";
		echo  "    <option  value='NULL'></option>\n";
		numberList(1,  31);
		echo "   </select>\n";
	}

	//  month selector
	$months =  array(
		"", "January",  "February",  "March",
		"April", "May",  "June",
		"July", "August",  "September",
		"October",  "November",  "December"
	);

	if  ($display[1]) {
		echo "   <select  name='{$name}_month'>\n";
		foreach  ($months as $value => $display)  {
			echo  "    <option  value='$value'>$display</option>\n";
		}
		echo  "   </select>\n";
	}

	//  year selector
	if ($display[2])  {
		echo "   <select  name='{$name}_year'>\n";
		echo  "    <option  value='NULL'></option>\n";
		numberList($startyear,  $endyear);
		echo "   </select>\n";
	}

	echo  "  </td>\n";
	echo  " </tr>\n\n";
}

/* using dateQuest in your questionnaire */

echo "<table>\n";

/* shows day, month and year
 * starting at year 2020 down to 2005
 */
dateQuest("what day is it?", "date",  2020, 2005);

/* shows only year from 1900 to 
 *the current year - date('Y') 
 */
dateQuest("what year were you  born?", "born", 1900, date('Y'), 
	array(false, false, true));	
	
echo "</table>\n\n";

?>

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