最近在碰PHP，刚好遇到一个问题，涉及到多维数组排序问题。该系列数组都有个关键key PID，要求按照PID将数组重新排列一遍。仅仅排序第一层array即可。使用了array_multisort()，但出现报错。如下：
Array( [0] => Array ( [pid] => 0 [title] => 首页 [path] => index [current] => 0 [link] => /index.php ) [1] => Array ( [tid] => 3 [pid] => 8 [mid] => 8 [topid] => 0 [upid] => 0 [exmid] => 0 [linkid] => 2 [gotoid] => 17 [lng] => cn [larray] => Array ( [0] => Array ( [tid] => 17 [pid] => 50 [mid] => 8 [topid] => 3 [upid] => 3 ) [1] => Array ( [tid] => 18 [pid] => 50 [mid] => 8 [topid] => 3 [upid] => 3 ) [2] => Array ( [tid] => 19 [pid] => 50 [mid] => 8 [topid] => 3 [upid] => 3 ) ) ) [2] => Array ( [tid] => 5 [pid] => 2 [mid] => 3 [topid] => 0 [upid] => 0 [exmid] => 0 [larray] => Array ( [0] => Array ( [tid] => 11 [pid] => 50 [mid] => 3 [topid] => 5 [upid] => 5 ) [1] => Array ( [tid] => 12 [pid] => 50 [mid] => 3 [topid] => 5 [upid] => 5 ) [2] => Array ( [tid] => 22 [pid] => 50 [mid] => 8 [topid] => 5 [upid] => 5 ) ) ) [3] => Array ( [tid] => 50 [pid] => 4 [mid] => 8 [topid] => 0 [upid] => 0 [larray] => ) )
Array( [0] => Array ( [pid] => 0 [title] => 首页 [path] => index [current] => 0 [link] => /index.php ) [1] => Array ( [tid] => 5 [pid] => 2 [mid] => 3 [topid] => 0 [upid] => 0 [exmid] => 0 [larray] => Array ( [0] => Array ( [tid] => 11 [pid] => 50 [mid] => 3 [topid] => 5 [upid] => 5 ) [1] => Array ( [tid] => 12 [pid] => 50 [mid] => 3 [topid] => 5 [upid] => 5 ) [2] => Array ( [tid] => 22 [pid] => 50 [mid] => 8 [topid] => 5 [upid] => 5 ) ) ) [2] => Array ( [tid] => 50 [pid] => 4 [mid] => 8 [topid] => 0 [upid] => 0 [larray] => ) [3] => Array ( [tid] => 3 [pid] => 8 [mid] => 8 [topid] => 0 [upid] => 0 [exmid] => 0 [linkid] => 2 [gotoid] => 17 [lng] => cn [larray] => Array ( [0] => Array ( [tid] => 17 [pid] => 50 [mid] => 8 [topid] => 3 [upid] => 3 ) [1] => Array ( [tid] => 18 [pid] => 50 [mid] => 8 [topid] => 3 [upid] => 3 ) [2] => Array ( [tid] => 19 [pid] => 50 [mid] => 8 [topid] => 3 [upid] => 3 ) ) ) )
建议贴出 var_export();后的数组以便测试
等高手，我只会选择排序
设原数组为 $ar，则有
array_multisort(array_map(function($item){ return $item['pid']; }, $ar), $ar); 建议贴出 var_export();后的数组以便测试
这个就是 print_r 打印出来的
建议贴出 var_export();后的数组以便测试
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