Web Hosting Talk : Web Hosting Main Forums : Programming Discussion : (PHP) Notice: Use of undefined constant

[Trilogen]

I'm a noob here, reading through SAMs PHP & MySQL Web Development. I can't get around this problem.

PHP Code:

$products = array( array("TIR", "Tires", 100),
        array( "OIL", "Oil", 10),
        array( "SPK", "Spark Plugs", 4));

function compare($x, $y)
{
    if ( $x[1] == $y[1] )
        return 0;
    else if ( $x[1] < $y[1] )
        return -1;
    else
        return 1;
}

usort($products, compare); 


I'ts supposed to sort the arrays inside $products

Outputs:

Notice: Use of undefined constant compare - assumed 'compare' in C:\Inetpub\wwwroot\PHP\usort.php on line 16

[Burhan]

Change to usort($products, 'compare');

Any string not encapsulated in quotes is considered a constant, and that message is just a Notice telling you that PHP thinks compare is a constant, but its not defined anywhere.

[Trilogen]

That did the trick, thanks fyre!