英文:
Php pass object path to function
问题
这可能很简单。给定以下对象和函数：
$object = new stdClass();
$object->a = 'Here we go';
$object->b->first = "again";
$object->b->second = "and again";
function get_item($object, $item){
print_r($object->{$item});
}
get_item($object, "a"); // works
get_item($object, "b->first"); // NOTICE Undefined property: stdClass::$b
虽然将单个属性传递给函数可以正常工作，但传递类似 b->first 的路径会失败。有人可以指导我如何解决这个问题吗？
英文:
this might be super easy. Given is the following object and function:
$object = new stdClass();
$object->a = 'Here we go';
$object->b->first = "again";
$object->b->second = "and again";
function get_item($object, $item){
print_r($object->{$item});
}
get_item($object, "a"); // works
get_item($object, "b->first"); // NOTICE Undefined property: stdClass::$b
While it's working to pass a single property to a function, passing a path like b->first fails. Can someone bring me on track how to solve this?
答案1
得分: 4
你不能直接这样做，但可以逐级进行，所以在函数中使用explode()将其拆分为每个级别，然后逐个应用它...
function get_item($object, $item){
$output = $object;
foreach ( explode("->", $item) as $level ) {
$output = $output->{$level};
}
print_r($output);
}
英文:
You cannot do it directly, but you can do it level by level, so in the function use explode() to split it into each level and apply it one at a time...
function get_item($object, $item){
$output = $object;
foreach ( explode("->", $item) as $level ) {
$output = $output->{$level};
}
print_r($output);
}
答案2
得分: 1
You can also do this way, instead of get_item($object, "b->first"); use get_item($object->b, "first");
<?php
$object = new stdClass();
$object->b = new stdClass();
$object->b->first = "again";
$object->b->second = "and again";
function get_item($object, $item){
print_r($object->{$item});
}
get_item($object->b, "first");
?>
英文:
You can also do this way, instead of get_item($object, "b->first"); use get_item($object->b, "first");
<?php
$object = new stdClass();
$object->b = new stdClass();
$object->b->first = "again";
$object->b->second = "and again";
function get_item($object, $item){
print_r($object->{$item});
}
get_item($object->b, "first");
?>
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