Accurately setting up a ranking from an single dimension array - php

Question

I would like to display some array data in relation to a competition, each player is ranked by the number of points they have, however if a player has the same amount of points to somebody else they should both have the exact same ranking position.
For instance...
1st Bob 500pts
2nd Joe 350pts
3rd Tom 250pts
3rd Tim 250pts
5th Jay 100pts
In this instance, as Tom & Tim have the exact same number of points they should be joint third, making the next person down 5th (rather than 4th), can anyone suggest the best way to achieve this with a simple array similar to follows
array('Bob' => 500, 'Joe' => '350', 'Tom' => '250', 'Tim' => '250', 'Jay' => '100');
Can anyone suggest the 'cleanest' solution for achieving this

Answer 1

This code will work for you:
$array = array('Bob' => 500, 'Joe' => '350', 'Tom' => '250', 'Tim' => '250', 'Jay' => '100');
arsort($array, SORT_NUMERIC);
$previousPoints = null;
$position = $total = 1;
foreach($array as $name=>$points) {
if ($points != $previousPoints) {
$position = $total;
}
echo $position.' '.$name.' '.$points."\n";
$previousPoints = $points;
$total++;
}
Online demo here.

Answer 2

$ar = array(
'Bob' => 500,
'Tim' => '250',
'Joe' => '350',
'Tom' => '250',
'Jay' => '100'
);
arsort($ar, SORT_NUMERIC);
$i = 1;
$previous = 1;
$previousPosition = 1;
foreach($ar as $k => $v)
{
if($v === $previous)
{
//If the value now is the same as the previous value use the previous position
echo "Position: $previousPosition, $k : $v <br />";
}
else
{
echo "Position: $i, $k : $v <br />";
}
//Previous value
$previous = $v;
//Previous Position
$previousPosition = $i;
//Always increment the value
$i++;
}

Answer 3

Try below code:
$a = array('Bob' => 500, 'Joe' => '350', 'Tom' => '250', 'Tim' => '250', 'Jay' => '100');
arsort($a);
$rank = 1;
$index = 1;
$prevUserPoints = 0;
foreach($a as $name=>$points) {
if($points != $prevUserPoints) {
$rank = $index;
}
$index++;
echo $rank . ' ' . $name . ' ' . $points . "\n";
$prevUserPoints = $points;
}
For displaying 1 as 1st, 2 as 2nd etc, you can use something like below:
function ordSuffix($n) {
$str = "$n";
$t = $n > 9 ? substr($str,-2,1) : 0;
$u = substr($str,-1);
if ($t==1) return $str . 'th';
else switch ($u) {
case 1: return $str . 'st';
case 2: return $str . 'nd';
case 3: return $str . 'rd';
default: return $str . 'th';
}
}
example: echo ordSuffix(23); This prints 23rd

Answer 4

Just a basic and alternative point of view you might want to consider.
$arr = [
"Joe" => "350",
"Tom" => "250",
"Jay" => "200",
"Tim" => "250",
"Bob" => "500",
"John" => "250" ,
"Paul" => "251.40"
];
$rank = array();
array_walk($arr,function($v, $k) use (&$rank)
{
if(isset($rank[$v]))
{
$rank[$v][$k] = $v;
asort($rank[$v]); //alphabetical order John, Tim, Tom
} else
{
$rank[$v] = array($k => $v);
}
});
krsort($rank);
var_dump(array_values($rank));