Questions about generating xml files in php (urgent)

Question about generating xml files in php (urgent) please help me. how can the following program generate xml files and read xml files? Foreach ($ forumsas $ k = & gt; $ v) {$ SQL = & quot; SELECT * FROM & quot ;. $ forum-& gt; _ prefix. $ forum-& gt; _ table _ php xml file generation (urgent)
Please help me. how does the following program generate xml files and read xml files?
Foreach ($ forums as $ k => $ v ){
$ SQL = "SELECT * FROM ". $ forum-> _ prefix. $ forum-> _ table_name. "WHERE parent_id = ". $ v ['forum _ id']. "order by post_cnt desc limit 0, 6 ";
$ Forums [$ k] ['mobiles'] = $ forum-> _ db-> fetchAll ($ SQL );
$ J_data = ($ forums [$ k] ['mobiles']);
Print_r ($ j_data );

Foreach ($ forums [$ k] ['mobiles'] as $ s => $ t ){
$ Prod_id = $ t ['prod _ id'];
$ SQL = "SELECT count (prod_id) FROM ". $ profileM-> _ prefix. $ profileM-> _ table_name. "WHERE prod_id = '". $ prod_id. "'group BY prod_id ";
$ Forums [$ k] ['mobiles'] [$ s] ['ucount'] = intval ($ profileM-> _ db-> fetchOne ($ SQL ));
}
}

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Please describe the problem clearly. do you have to guess what you want first. And then help you solve the problem?
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Foreach