如何获取此PHP脚本的输出？

Question

I'm a newbie to programming and PHP learning about two dimensional arrays.

When I run this code below, it just gives me a blank page. When I put an echo in front of the function call like this echo usort($a, 'mysort1'); the page shows me a 1 (I have no idea why).

What I really want to see is the output of the array after it's been sorted.

Doing var_dump($a); is not what I'm after. how do I show the result of the function?

How? Thanks if you can help.

<?php

$a = array (
array ('key1' => 940, 'key2' => 'blah'),
array ('key1' => 23, 'key2' => 'this'),
array ('key1' => 894, 'key2' => 'that')
);


function mysort1($x, $x) {
     return ($x['key1'] > $y['key']);

}

usort($a, 'mysort1'); 


?> 

Answer 1

For starters I think you have two typos in your comparison function:

                     //should be $y not $x
function mysort1($x, $y) {
     return ($x['key1'] > $y['key1']);  // Should be $y['key1']
}

Next, usort sorts the array in place returning TRUE on success and FALSE otherwise, that is why you see a 1 when you echo it's return value.

Try:

print_r($a);

to display the sorted array.