Compare Two arrays and merging in PHP

I have two arrays :

$array1 = array(1=>1,10=>1,12=>0,13=>13);
 $array2 = array(1=>"Hello",10=>"Test",12=>"check",13=>"error");
 

Here $array1 have keys and values.Now i want to take first value from $array1(as 1) and want to check if this is repeated in this array .

Here 1 is repeated two times so i want to take the twp keys 1,10 and display the corresponding values of this keys from $array2.If the value in $array1 not repeated just display the value of this key from $array2.

That is i want to get the output as :

Hello Test
 check
 error
 

That means ,
In $array1 1,10 keys have same value so value of 1 and 10 from $array2 is merged.then displayed.

Like 12 ,have 0 this is not repeated so simply take value of 12 from $array2.

Like 13.

How can i do this?

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