获取数组中有重复值的元素
$data = [
'a' => 'aa',
'b' => 'aa',
'c' => 'cc',
'd' => 'cc',
'e' => 'ee',
];
$uni = array_unique($data);
$repeat = array_diff_assoc($data, $uni);
print_r($repeat);
/*Array
(
[b] => aa
[d] => cc
)*/
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