javascript - [Algorithm] Set the randomly given key-value pair to the first position in the array. How to implement this?

Give me an example:

<code>$arr = array(
    '175' => '金针菇'
    '100' => '银针菇'
);

$arr2 = array(
    '65'  => '白萝卜'
    '67'  => '黑萝卜'
    '84'  => '黄萝卜'
    '100' => '银针菇'
    '90'  => '大萝卜'
    '175' => '金针菇'
);
</code>

The final effect is like this:

<code>$arr3 = array(
    '175' => '金针菇'
    '100' => '银针菇'
    '65'  => '白萝卜'
    '67'  => '黑萝卜'
    '84'  => '黄萝卜'
    '90'  => '大萝卜'
    
);</code>

Please tell me, how to implement such an algorithm?

Reply content:

Give me an example:

<code>$arr = array(
    '175' => '金针菇'
    '100' => '银针菇'
);

$arr2 = array(
    '65'  => '白萝卜'
    '67'  => '黑萝卜'
    '84'  => '黄萝卜'
    '100' => '银针菇'
    '90'  => '大萝卜'
    '175' => '金针菇'
);
</code>

The final effect is like this:

<code>$arr3 = array(
    '175' => '金针菇'
    '100' => '银针菇'
    '65'  => '白萝卜'
    '67'  => '黑萝卜'
    '84'  => '黄萝卜'
    '90'  => '大萝卜'
    
);</code>

Please tell me how to implement such an algorithm?

This question has been closed. I wrote it myself. When I asked the question, I thought it was complicated. After I calmed down, I realized how simple it is. I’ll post the code:

<code>foreach ($arr2 as $key => $value) {
    if(!in_array($value, $arr)) {
        $arr[$key] = $value;
    }
}
var_dump($arr);</code>

<code>return($arr + $arr2);</code>