<?php $members = [ 'myname' => ['userid' => 52, 'age' => 46], 'isname' => ['userid' => 22, 'age' => 47], 'yourname' => ['userid' => 47, 'age' => 85] ]; foreach ($members as $col => $row) { $members[$col][] = $col; } var_export($members);
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