怎么判断数组里面有多少个相同元素

如何判断数组里面有多少个相同元素？

<br />
$a=array('2','1','2');//如何判断里面有几个相同的元素，并且知道相同的元素在什么位置<br />

求指点谢谢

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------解决方案--------------------

$a = array('2','1','2');<br />
$xt = array_diff(array_count_values($a), array(1));<br />
print_r($xt);<br />
<br />
foreach(array_keys($xt) as $v) {<br />
  echo $v, ': ', join(',', array_keys(array_filter($a, function($c) use ($v) { return $c == $v; })));<br />
}

Array
(
    [2] => 2
)
2: 0,2

Related labels：

array function keys nbsp XT

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