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MySQL SELECT database entries with the same column value
+----+---------+--------------+
| ID | user_id | meta_key1    |
+----+---------+--------------+
|  1 |       1 |    d         |
|  2 |       1 |    f         |
|  3 |       1 |    c         |
|  4 |       2 |    g         |
|  5 |       3 |    1         |
|  6 |       3 |    2         |
|  7 |       4 |    4         |
|  8 |       4 |    5         |
|  9 |       4 |    5         |
| 10 |       4 |    5         |
+----+---------+--------------+

$query = mysql_query("SELECT * FROM table_name WHERE user_id='1'");
$row = mysql_fetch_assoc($query);

while($row){
    return $row["meta_key1"];
}

d

d
f
c

while($row = mysql_fetch_assoc($query);){
    echo $row["meta_key1"];
}

while( $row = mysql_fetch_assoc($query)){
    echo $row["meta_key1"];
}

$return = array();
while( $row = mysql_fetch_assoc($query)){
    $return[] = $row["meta_key1"];
}
return $return;