如何使用命名参数调用
PHP 函数
代码如下:
<?php
$x = function($bar, $foo="9") {
echo $foo, $bar, "\n";
};
class MissingArgumentException extends Exception {
}
function call_user_func_named_array($method, $arr){
$ref = new ReflectionFunction($method);
$params = [];
foreach( $ref->getParameters() as $p ){
if
(!$p->isOptional()
and
!isset($arr[$p->name]))
throw
new
MissingArgumentException("Missing parameter $p->name");
if (!isset($arr[$p->name])) $params[] = $p->getDefaultValue();
else $params[] = $arr[$p->name];
}
return $ref->invokeArgs( $params );
}
function make_named_array_function($func) {
return function($arr) use ($func) {
return call_user_func_named_array($func,$arr);
};
}
call_user_func_named_array($x, ['foo' => 'hello ', 'bar' => 'world']); //Pass all parameterss
call_user_func_named_array($x, ['bar' => 'world']); //Only pass one parameter
call_user_func_named_array($x, []); //Will throw exception
$y = make_named_array_function($x);
$y(['foo' => 'hello ', 'bar' => 'world']); //Pass all parameterss
$y(['bar' => 'world']); //Only pass one parameter
$y([]); //Will throw exception