[php] php lambda

<?php
// http://cn.php.net/manual/zh/function.create-function.php
$lambda = create_function('$a,$b','return ($a > $b)? $a : $b;');
var_dump($lambda);
echo $lambda(1,2);

下面一些具体的示例

function do_foreach($arrData,$func) {
    $arrResult = array(); 
    foreach($arrData as $row) {
        if($return = $func($row)) {
            $arrResult[] = $return;
        }
    }
    return $arrResult;
}

// 所有元素+1
$func1 = 'return $row + 1;';
var_dump(do_foreach(array(1,2,3,4),create_function('$row',$func1)));

// 所有元素平方
$func1 = 'return $row * $row;';
var_dump(do_foreach(array(1,2,3,4),create_function('$row',$func1)));

// 只是输出
$func1 = 'echo $row,"<br/>";';
do_foreach(array(1,2,3,4),create_function('$row',$func1));