PHP 5.3闭包语法初探

PHP 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

$closure = function($param) { echo $param; };

//This one takes value of someVar and stores it in the closures scope even if

//we later change the value of someVar outside it

// We assume that $somerVar is defined before this

$closure = function($param) use ($someVar) { echo $param $someVar; };

比如在输出HTML中闭包很有用

function item_list(array $items $formatter = null) {

//create the default formatter

if($formatter == null) {

$formatter = function($row) {

return ﹤p﹥ $row ﹤/p﹥;

};

}

$html = ﹤h﹥Listing:﹤/h﹥;

foreach($items as $item) {

$html = $formatter($item);

}

return $html;

}