MySQL Discourse pairing

MySQL statement pairing
For example, table A news table A news belongs to the category field Newsca to 12,14,20,
Another Table B category table CID CNAME
12 14 20 that corresponds to CID.
Now change the News check box
How to tell if news belongs to category selected
What data can be obtained without knowing how to put 12,14,20, separate and then pair


------Solution--------------------
Refer to the following example

PHP Code

$ar =array (  ' id ' =>12, ' name ' = ' = ' Category 1 '),   array (' ID ' =>11, ' name ' = ' = ' Category 2 '),  array (' id ' = >50, ' name ' = ' 3 '); $f = ' 12,34 '; foreach ($ar as $v) {     $k =strpos ($f, $v [id])!==false? ' Checked '  : ';      echo "" ;}
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