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phparrayssortingksort

Sort an array by keys which are composed of three dot-delimited integers

I need to dynamically compose an array having keys like:

1.1.2
2.1.3
2.1.13

After composing I need to order data by key but I get a result different from needed:

$Vals = array(
    "1.1.2" => "First",
    "2.1.3" => "Second",
    "2.1.13" => "Third"
);
ksort($Vals);

foreach ($Vals as $x => $x_value) {
   echo "Key=" . $x . ", Value=" . $x_value;
   echo "<br>";
}

I get:

Key=1.1.2, Value=First
Key=2.1.13, Value=Third
Key=2.1.3, Value=Second

instead of

Key=1.1.2, Value=First
Key=2.1.3, Value=Second
Key=2.1.13, Value=Third

Solution

  • You're doing simple lexicographical comparison, but what you're trying to compare are version number identifiers, which have their own logic. PHP has a function to compare such standardised version number strings: version_compare.

    uksort($Vals, 'version_compare');