php AJAX和PHP

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<?php
// People Array @TODO - Get from DB
$people[] = "Steve";
$people[] = "John";
$people[] = "Kathy";
$people[] = "Evan";
$people[] = "Anthony";
$people[] = "Tom";
$people[] = "Rhonda";
$people[] = "Hal";
$people[] = "Ernie";
$people[] = "Johanna";
$people[] = "Farrah";
$people[] = "Linda";
$people[] = "Shawn";
$people[] = "Olivia";
$people[] = "Derek";
$people[] = "Amanda";
$people[] = "Rachel";
$people[] = "Katie";
$people[] = "Jillian";
$people[] = "Jose";
$people[] = "Malcom";
$people[] = "Greg";
$people[] = "Mary";
$people[] = "Brad";
$people[] = "Mike";

// Get Query String
$q = $_REQUEST['q'];

$suggestion = "";

// Get Suggestions
if($q !== ""){
	$q = strtolower($q);
	$len = strlen($q);
	foreach($people as $person){
		if(stristr($q, substr($person, 0, $len))){
			if($suggestion === ""){
				$suggestion = $person;
			} else {
				$suggestion .= ", $person";
			}
		}
	}
}

echo $suggestion === "" ? "No Suggestion" : $suggestion;
<!DOCTYPE html>
<html>
<head>
	<title>Search User</title>
	<link rel="stylesheet" href="http://bootswatch.com/cerulean/bootstrap.min.css">
	<script>
		function showSuggestion(str){
			if(str.length == 0){
				document.getElementById('output').innerHTML = '';
			} else {
				// AJAX REQ
				var xmlhttp = new XMLHttpRequest();
				xmlhttp.onreadystatechange = function(){
					if(this.readyState == 4 && this.status == 200){
						document.getElementById('output').innerHTML = this.responseText;
					}
				}
				xmlhttp.open("GET", "suggest.php?q="+str, true);
				xmlhttp.send();
			}
		}
	</script>
</head>
<body>
	<div class="container">
	    <h1>Search Users</h1>
	    <form> 
	    	Search User: <input type="text" class="form-control" onkeyup="showSuggestion(this.value)">
	    </form>
	    <p>Suggestions: <span id="output" style="font-weight:bold"></span></p>
</div>
</body>
</html>

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