How does php obtain the array in the variable and assign it to the variable?-php Tutorial

How does php obtain the array in the variable and assign it to the variable? PHPcode: How do I perform the following actions when $ products1001: (There is one execution statement) $ db-& gt; query (& quot; UPDATE {$ _ pre} contentSETstorages php how can I retrieve the array in the variable and assign the value to the variable?

PHP code

  How can I perform the following actions when $ products = 100 = 1: (one execution statement exists at this time) $ db-> query ("UPDATE {$ _ pre} content SET storage = storage-1 WHERE id = '000000 '"); how can I perform the following actions when $ products = 100 = 1,104 = 3: (two statements are executed at this time) $ db-> query ("UPDATE {$ _ pre} content SET storage = storage-1 WHERE id = '000000 '"); $ db-> query ("UPDATE {$ _ pre} content SET storage = storage-3 WHERE id = '000000 '"); when $ products = 100 = 1,104 = 8,204 = 4,243 = 2,690 = 1, how do I perform the following actions: (five statements are executed at this time) $ db-> query ("UPDATE {$ _ pre} content SET storage = storage-1 WHERE id = '000000 '"); $ db-> query ("UPDATE {$ _ pre} content SET storage = storage-8 WHERE id = '000000 '"); $ db-> query ("UPDATE {$ _ pre} content SET storage = storage-4 WHERE id = '000000 '"); $ db-> query ("UPDATE {$ _ pre} content SET storage = storage-2 WHERE id = '000000 '"); $ db-> query ("UPDATE {$ _ pre} content SET storage = storage-1 WHERE id = '000000 '");

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PHP code

$products ='100=1,104=8,204=4,243=2,690=1';foreach(explode(',',$products) as $v){       $t=explode('=',$v);       $db->query("UPDATE {$_pre}content SET storage=storage-{$t[1]} WHERE id='{$t[0]}'");}