Sorting of some strings? - php

Question

I can only imagine that this is fairly simple, and yet the solution eludes me.
Let assume I have the following variables:
$group1 = "5";
$group2 = "1";
$group3 = "15";
$group4 = "3";
$group5 = "7";
$group6 = "1";
$group7 = "55";
$group8 = "0";
$group9 = "35";
I want the groups listed with the highest amount first e.g.:
Group 7 is number 1 with 55.
Group 9 is number 2 with 35.
Group 3 is number 3 with 15.
Group 5 is number 4 with 7.
Group 1 is number 5 with 5.
Group 4 is number 6 with 3.
Group 2 is number 7 with 1.
Group 6 is number 8 with 1.
Group 8 is number 9 with 0.
Perhaps it would be easier to list all the data in a double-array and then sort it?

Answer 1

First of all, use arrays(just usual arays).
If you array is
$group = array(1 => 5, 2 => 1 ... )
You may use arsort function.
Here I use numbers, not strings. If you will use strings (for values) you need a flag for sort (SORT_NUMERIC)
More information in PHP Manual
Then use foreach
foreach($group as $key => $value){
$key is number of varaiable
$value is value of it.
you also may add counter to print 1,2,3...
}

Answer 2

use arrays for this purpose
$group[1] = "5";
$group[2] = "1";
$group[3] = "15";
$group[4] = "3";
$group[5] = "7";
$group[6] = "1";
$group[7] = "55";
$group[8] = "0";
$group[9] = "35";
and then sort it.
arsort($group, SORT_NUMERIC); // SORT_NUMERIC suggested by **fab**

Answer 3

Just have your data inside an associative array, and sort it with an association aware sort:
$groups = array(
'group1' => "5",
'group2' => "1",
'group3' => "15",
'group4' => "3",
'group5' => "7",
'group6' => "1",
'group7' => "55",
'group8' => "0",
'group9' => "35",
);
arsort($groups);
// iteration as usual
foreach ($groups as $group_name => $value) {
}
// getting elements with the array functions based around the array's internal pointer
reset($groups); // reset the pointer to the start
print key($groups); // the first element's key
print current($groups); // the first element's value
next($groups); // moving the array to the next element

Answer 4

Yes using an array is the best thing to do.
something like that
$group[1]="5";
$group[2]="1";
After that you can sort your array

Answer 5

The best way to do this is with an array and arsort. This will keep your indexes intact.
arsort returns a boolean so do not assign to a new variable
$groups = array("5","1","15","3","7","1","55","0","35");
arsort($groups, SORT_NUMERIC);
$i = 1;
foreach ($groups as $key => $val) {
echo 'Group ' . $key . ' is number ' . $i . ' with ' . $val;
$i++;
}

Answer 6

Put your groups in an array
$groups = array("5","1","15","3","7","1","55","0","35");
arsort($groups); //This sort the array is descending order
var_dump($sorted_groups);
To print the array in your format use the following function
count = 1;
foreach($groups as $key => $value) {
echo "Group ".($key+1)." is number ".$count++." with ".$value;
}