要求:
- 占位符支持
- 部分应用函数可以应用于部分应用函数
- 咖喱
- 5.6 PHP 支持
这是我的尝试,但它仅支持 hhvm 3.7,如您在http://3v4l.org/0i5FV上的示例中所见
<?php
class Placeholder{}
function curry(callable $func, ... $curriedArgs) {
return function(...$fulfillment) use ($func, $curriedArgs) {
$removedPlaceheldArgs = array_map(function($arg) use ($fulfillment) {
if ($arg instanceof Placeholder)
return array_shift($fulfillment);
return $arg;
}, $curriedArgs);
return $func(...array_merge($removedPlaceheldArgs, $fulfillment));
};
};
这是我的用法示例:
$resultset = json_decode('[{
"id": 1,
"gender": "Male",
"name": "Matthew"
}, {
"id": 2,
"gender": "Male",
"name": "Willie"
}, {
"id": 3,
"gender": "Female",
"name": "Ann"
}, {
"id": 4,
"gender": "Female",
"name": "Margaret"
}, {
"id": 5,
"gender": "Female",
"name": "Marie"
}]',TRUE);
$filterGender = function($row,$gender){
return $row['gender']==$gender;
};
$detectMen = curry($filterGender,(new Placeholder),'Male');
$detectWomen = curry($filterGender,(new Placeholder),'Female');
var_dump($detectMen(['gender'=>'Male'])); //works -- expected result TRUE
$getLadies = curry('array_filter',(new Placeholder),$detectWomen);
var_dump($getLadies($resultset)); //does not work -- expected result Ladies from result set
$getLadies 结果可以在 PHP 5.6 中实现,而不仅仅是 hhvm?