ID: 9482
Updated by: torben
Reported By: [EMAIL PROTECTED]
Old-Status: Open
Status: Closed
Bug Type: *General Issues
Assigned To:
Comments:
This isn't a bug; it's a result of the differing precedence for || and or (which
are otherwise identical, btw).
Try this:
$db = mysql_connect("localhost", "root") || print "error connecting";
echo $db;
The output should be '1'. The reason is that || has higher precedence than =,
so PHP sees the above statement as:
$db = (mysql_connect("localhost", "root") || print "error connecting");
...which means that $db is assigned the value of the expression in parens, which
in this case will always evaluate to 1, which is not a valid MySQL resource.
Next try this:
($db = mysql_connect("localhost", "web")) || print "error connecting ";
echo $db;
The output should be 'Resource id #1', since the precedence has now been forced.
The other way to force precedence is to use the lower-precedence 'or', as you
mentioned.
The operator precedence table can be found in the manual at:
http://www.php.net/manual/en/language.operators.precedence.php
Hope this helps,
Torben
Previous Comments:
---------------------------------------------------------------------------
[2001-02-27 10:52:12] [EMAIL PROTECTED]
<?
$db = mysql_connect("localhost", "web") || print "error connecting ".mysql_error()."
".mysql_errno();
mysql_select_db("surveys");
$result = mysql_query("select * from attract") || print "error querying
".mysql_error()." ".mysql_errno();
$i = 0;
while ($row = mysql_fetch_array($result)){ // && ($i++ < 5)){
echo $row[0]." ".$row[1]."<br>";
}
?>
this script will repeatedly give me invalid MySQL Link Resource Warnings, but by
changing the "||" to "or" it will work fine.
Thanks
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