Description:
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I always thought '||' and 'or' was the same.
Combined with a mysql_query() however, they are not.

These lines are the same:
mysql_query("$var") or die("help!");
mysql_query("$var") || die("help!");
where $var is a DROP, INSERT or CREATE query, but they are *not* the same if $var is a SELECT query; the returned value will not be a 'Resource ID' in the latter line.

Reproduce code:
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mysql_query("DROP TABLE IF EXISTS foobar") || die('Cannot drop table'); 
mysql_query("CREATE TABLE IF NOT EXISTS foobar (foo INT NOT NULL AUTO_INCREMENT, bar TINYINT(1), PRIMARY KEY (foo))") || die('Cannot make table'); 

// Let's insert some random stuff
mysql_query("INSERT INTO foobar (bar) VALUES (0)") || die('Cannot add values 1'); 
mysql_query("INSERT INTO foobar (bar) VALUES (1)") || die('Cannot add values 2'); 
mysql_query("INSERT INTO foobar (bar) VALUES (0)") or die('Cannot add values 3'); 
mysql_query("INSERT INTO foobar (bar) VALUES (1)") or die('Cannot add values 4'); 

$handle1 = mysql_query("SELECT * FROM foobar WHERE 1") || die('Cannot select'); 
$handle2 = mysql_query("SELECT * FROM foobar WHERE 1") or die('Cannot select'); 

echo '$handle1 is '.$handle1.'<br><br>';
echo '$handle2 is '.$handle2.'<br><br>';

Expected result:
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$handle1 is Resource id #2
$handle2 is Resource id #3

Actual result:
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$handle1 is 1
$handle2 is Resource id #3