Php Basics. why is there an error in the blank page of this program? How to make it output sorted results

Php Basics. why is there an error in the blank page of this program? How can I make it output the sorted results? This post was last edited by u013071929 from 2013-12-11& lt ;? Php $ prodects & nbsp; array (HDL, Tires, 100), & nbsp; array (OIL, O php Basics, why does this program display a blank page, where is the error? How to make it output sorted results

This post was last edited by u013071929 at 22:59:16 on

 $ Prodects = array ('till', 'tires ', 100 ),
Array ('oil ', 'Oil', 10 ),
Array ('spk', 'spark S s', 4 ));

Function compare ($ x, $ y)
{
If ($ x [1] = $ y [1]) // What are the values of x [1] and y [1?
{
Return 0;
} Else if ($ x [1] <$ y [1])
{
Return-1;
} Else
{
Return 1;
}
}
Usort ($ products, 'Company ');

Foreach ($ products as $ key)
{
Echo '|'. $ key. '| ';
}
Echo"
";
?>

Php Basics. why is there an error in the blank page of this program? How to make it output the sorted results,

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------ Solution --------------------
$ Prodects = array ('till', 'tires ', 100 ),
Array ('oil ', 'Oil', 10 ),
Array ('spk', 'spark S s', 4 ));

Usort ($ products, 'Company ');

It's clear.
------ Solution --------------------
Compare the two values of x [1] and y [1] codes.
------ Solution --------------------
The index value of each element in the array is used for comparison. the following values are marked as red:
$ Prodects = array ('till', 'tires ', 100 ),
Array ('oil ', 'Oil', 10 ),
Array ('spk', 'spark S s', 4 ));
------ Solution --------------------
Function compare ($ x, $ y)
{
Var_dump ($ x, $ y); // you will not be able to find it.

The reason for no output is that $ products does not exist.