<?php

$a = array(array( 'teamid' => 'abc', 'distance' => 1.25 ), array( 'teamid' => 'xyz', 'distance' => 0.25 ));

$distance = array();
foreach ($a as $key => $row)
{
    $distance[$key] = $row['distance'];
}
array_multisort($distance, SORT_ASC, $a);

print_r($a);