Php 如何查找键为特定值的对象的索引?
希望我说得对 我怎样才能找到ID=68的索引 我需要帮助创建一个函数,将返回索引2。。。谢谢Php 如何查找键为特定值的对象的索引?,php,wordpress,Php,Wordpress,希望我说得对 我怎样才能找到ID=68的索引 我需要帮助创建一个函数,将返回索引2。。。谢谢 $posts = Array ( [0] => stdClass Object ( [ID] => 20 [post_author] => 1 [post_content] => [post_title] => Carol Anshaw
$posts = Array (
[0] => stdClass Object
(
[ID] => 20
[post_author] => 1
[post_content] =>
[post_title] => Carol Anshaw
)
[1] => stdClass Object
(
[ID] => 21
[post_author] => 1
[post_content] =>
[post_title] => Marie Arana
)
[2] => stdClass Object
(
[ID] => 68
[post_author] => 1
[post_content] =>
[post_title] => T.C. Boyle
)
[3] => stdClass Object
(
[ID] => 1395
[post_author] => 1
[post_content] =>
[post_title] => Rosellen Brown
)
)
function getKeyForId($id, $haystack) {
foreach($haystack as $key => $value) {
if ($value->ID == $id) {
return $key;
}
}
}
$keyFor68 = getKeyForId(68, $posts);
但让特定函数挂起是没有意义的。您可以这样使用:
用法示例:
$posts = new Posts();
$posts[] = new StdClass();
$posts[0]->ID = 1;
$posts[0]->post_title = 'foo';
$posts[] = new StdClass();
$posts[1]->ID = 68;
$posts[1]->post_title = 'bar';
$posts[] = new StdClass();
$posts[2]->ID = 123;
$posts[2]->post_title = 'test';
echo "key for post 68: ";
echo $posts->getKeyForId(68);
echo "\n";
var_export($posts[$posts->getKeyForId(68)]);
输出:
key for post 68: 1
stdClass::__set_state(array(
'ID' => 68,
'post_title' => 'bar',
))
您可以像下面这样搜索它
findIndexById(68,$array)
如果发现其他错误,它将返回数组的索引。这可能是$index=$posts[2]
?
key for post 68: 1
stdClass::__set_state(array(
'ID' => 68,
'post_title' => 'bar',
))
function findIndexById($id, $array) {
foreach($array as $key => $value) {
if($value->ID == $id) {
return $key;
}
}
return false;
}