How to get the value of an array in PHP

How to get the value of an array in PHP
I have a value from table contents2 that gets the name
$result =mysql_query ("Select A.name from Contents2 a where a.level< ' $level ' and a.group= ' $group '");
$myrow =mysql_fetch_array ($result);
The name derived from this has several values, for example: 31, Zhang San 2, Zhang San 3
I need to check the value in Contents3 according to the name, how to write the SQL statement?
$result 2=mysql_query ("select * from Contents3 a where a.name=?")
is how to put the value of array to a.name=?

------Solution--------------------
$myrow =mysql_fetch_array ($result);
=
while ($myrow =mysql_fetch_array ($result)) {
$arr []= $myrow [0];
}

$s = "'". Join ("', '", $arr). "'";
$result 2=mysql_query ("select * from Contents3 a where a.name in ($s)")

------Solution--------------------
You can directly put the results of the SQL statement query directly into the select in () parentheses, so that there is no trouble getting the array value.

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