Function query won't execute - php

Question

Why won't this query work?!?
Error
Parse error: syntax error, unexpected T_STRING in E:\xampp\htdocs\pf\shop\buy.php on line 5
Example Info For Variables
$character->islots = 20
$chatacter->name = [RE] Tizzle
$e2 = 10
The Function
function increaseSlots($e2) {
$slots = ($character->islots)+($e2);
mysql_query('UPDATE `phaos_characters` SET `inventory_slots`="'.$slots.'" WHERE `name`="'.$character->name.'"'); // <-- Line 5
if (mysql_affected_rows() != 0) {
echo 'Inventory Size Incresed By '.$e2.' Slots';
}else{
echo mysql_error();
}
}

Answer 1

Look at the docs: http://php.net/manual/en/function.mysql-num-rows.php
Retrieves the number of rows from a result set. This command is only valid for statements like SELECT or SHOW that return an actual result set. To retrieve the number of rows affected by a INSERT, UPDATE, REPLACE or DELETE query, use mysql_affected_rows().
You need to use mysql_affected_rows() or better yet, PDO or mysqli.

Answer 2

$slots = ($character->islots)+($e2);
Looks like there is a typo. Try:
$slots = ($character->slots)+($e2);

Answer 3

First off you should know that mysql_num_rows only returns a valid result for SELECT or SHOW statements, as stated in the PHP documentation. You can use mysql_affected_rows() for your particular needs.
However, the old PHP MySQL API (that you are using) is being phased out, so I would recommend using mysqli or PDO for your DB connection needs.
While keeping with your requirements, though, you can try to use the following syntax to make sure you receive the MySQL error if it throws one. Your PHP script will stop, but you will see the error.
$query = sprintf('UPDATE `phaos_characters` SET `inventory_slots`=%d WHERE `name`="%s"',$slots,$character->name)
$result = mysql_query($query) or die(mysql_error());
As a final idea, in situations like this it helps to print out your resulting $query and run it manually through something like phpMyAdmin to see what happens.

Answer 4

Bleh... I Found a better way to do it for the time being.. sorry to waste your guys' time...
I just threw the $character object into a variable before processing the function.
function increaseSlots($e2,$charname,$charslots) {
$slots = $charslots+$e2;
mysql_query('UPDATE `phaos_characters` SET `inventory_slots`="'.$slots.'" WHERE `name`="'.$charname.'"');
if (mysql_affected_rows() != 0) {
echo 'Inventory Size Incresed By '.$e2.' Slots';
}
}