[英]PHP Array combine values with same string key
我有以下似乎很常見但無法弄清楚哪個數組 function 可能適用於以下格式的問題:
(已經嘗試過array_merge
, array_merge_recursive
, array_combine
, array_splice
但沒有按預期工作。)
Array
(
[0] => Array
(
[r_id] => 11
[r_sid] => RC
[d_id] => 2
)
[1] => Array
(
[r_id] => 7
[r_sid] => RC
[c_id] => 51
)
[2] => Array
(
[r_id] => 6
[r_sid] => JN
[c_id] => 52
)
[3] => Array
(
[r_id] => 7
[r_sid] => JN
[c_id] => 51
)
[4] => Array
(
[r_id] => 7
[r_sid] => LG
[c_id] => 51
)
[5] => Array
(
[r_id] => 7
[r_sid] => BN
[c_id] => 51
)
[6] => Array
(
[r_id] => 6
[r_sid] => IVS
[c_id] => 52
)
[7] => Array
(
[r_id] => 7
[r_sid] => IVS
[c_id] => 51
)
)
現在,我需要通過通用r_sid
和c_id
鍵合並這個數組值; 唯一的特殊情況是如果有一個d_id
鍵而不是c_id
,那么我們將它與數組中具有相似r_sid
的任何值合並/組合。
最終的解決方案需要看起來像這樣,如果那更容易理解的話:
Array
(
[0] => Array
(
[r_id] => 11,7
[r_sid] => RC
[d_id] => 2
[c_id] => 51
)
[1] => Array
(
[r_id] => 6,7
[r_sid] => JN, IVS
[c_id] => 52,51
)
)
與任何人都不匹配的r_sid
值需要被丟棄。
任何幫助表示贊賞。 非常感謝!
這是我對如何合並數組的最佳解釋的一段代碼:
// filter out r_sid values which only occur once
$sid_values = array_count_values(array_column($array, 'r_sid'));
$array = array_filter($array, function ($a) use ($sid_values) { return $sid_values[$a['r_sid']] > 1; });
// combine arrays on r_sid values
$result = array();
foreach ($array as $arr) {
$sid = $arr['r_sid'];
// push data to arrays
$result[$sid]['r_sid'] = $sid;
$result[$sid]['r_id'][] = $arr['r_id'];
if (isset($arr['c_id'])) $result[$sid]['c_id'][] = $arr['c_id'];
if (isset($arr['d_id'])) $result[$sid]['d_id'][] = $arr['d_id'];
}
// combine all the c_id values into a string
array_walk($result, function (&$a) {
if (isset($a['c_id'])) $a['c_id'] = implode(',', $a['c_id']);
});
// now combine any r_sid values that have the same set of c_id values
$output = array();
foreach ($result as $res) {
$cid = $res['c_id'];
// push data to arrays
$output[$cid]['c_id'] = $cid;
$output[$cid]['r_sid'] = array_merge($output[$cid]['r_sid'] ?? array(), array($res['r_sid']));
$output[$cid]['r_id'] = array_merge($output[$cid]['r_id'] ?? array(), $res['r_id']);
if (isset($res['d_id'])) $output[$cid]['d_id'] = array_merge($output[$cid]['d_id'] ?? array(), $res['d_id']);
}
// combine the r_sid, r_id and d_id values into a string
array_walk($output, function (&$a) {
$a['r_sid'] = implode(',', $a['r_sid']);
$a['r_id'] = implode(',', array_unique($a['r_id']));
if (isset($a['d_id'])) $a['d_id'] = implode(',', $a['d_id']);
});
// remove the associative keys
$output = array_values($output);
Output:
Array
(
[0] => Array
(
[c_id] => 51
[r_sid] => RC
[r_id] => 11,7
[d_id] => 2
)
[1] => Array
(
[c_id] => 52,51
[r_sid] => JN,IVS
[r_id] => 6,7
)
)
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