Sort a flat array of numeric strings and preserve keys

Question

I have a PHP array like:

myarr[1] = "1",
myarr[2] = "1.233",
myarr[3] = "0",
myarr[4] = "2.5"

The values are actually strings, but I want this array to be sorted numerically. The sorting algorithm should respect float values and maintaining index association.

Answer 1

You can use the normal sort function. It takes a second parameter to tell how you want to sort it. Choose SORT_NUMERIC.

Example:

  sort($myarr, SORT_NUMERIC); 
  print_r($myarr);

prints

Array
(
    [0] => 0
    [1] => 1
    [2] => 1.233
    [3] => 2.5
)

Update: For maintaining key-value pairs, use asort (takes the same arguments), example output:

Array
(
    [3] => 0
    [1] => 1
    [2] => 1.233
    [4] => 2.5
)