【IT168 技术文章】PHP 5.3 将加入闭包语法，也就是匿名函数，允许开发者申明行内函数和在变量中保存。虽然这个语法和JavaScript的闭包相比有点怪异，但是对于PHP语言来说，这是一个良好的补充。
比如你现在就可以这样使用：
1 $closure = function($param) { echo $param; };
2
3 //This one takes value of someVar and "stores" it in the closure's scope even if
4
5 //we later change the value of someVar outside it. We assume that $somerVar is defined before this
6
7 $closure2 = function($param) use ($someVar) { echo $param . ' ' . $someVar; };
8
2
3 //This one takes value of someVar and "stores" it in the closure's scope even if
4
5 //we later change the value of someVar outside it. We assume that $somerVar is defined before this
6
7 $closure2 = function($param) use ($someVar) { echo $param . ' ' . $someVar; };
8
比如在输出HTML中闭包很有用：
1 function item_list(array $items, $formatter = null) {
2 //create the default formatter
3 if($formatter == null) {
4 $formatter = function($row) {
5 return '<p>' . $row . '</p>';
6 };
7 }
8
9 $html = '<h2>Listing:</h2>';
10 foreach($items as $item) {
11 $html .= $formatter($item);
12 }
13
14 return $html;
15 }
16
2 //create the default formatter
3 if($formatter == null) {
4 $formatter = function($row) {
5 return '<p>' . $row . '</p>';
6 };
7 }
8
9 $html = '<h2>Listing:</h2>';
10 foreach($items as $item) {
11 $html .= $formatter($item);
12 }
13
14 return $html;
15 }
16
