Question

How to sort an array of strings where each string represents a decimal number in PHP

Answer 1

// Comparator function to sort strings as decimal numbers
function compareAsDecimal(string $a, string $b): int {
    // Convert strings to float for comparison
    $numA = floatval($a);
    $numB = floatval($b);

    return $numA <=> $numB; // Equivalent to Java's Double.compare
}

// Input array of strings
$numbers = ["12.3", "5.6", "789.1", "3.14", "456.0", "0", "0.01", "4.0"];

// Sort the array using the custom comparator
usort($numbers, 'compareAsDecimal');

echo "Sorted array of decimal strings:\n";
foreach ($numbers as $num) {
    echo $num . "  ";
}



/*
run:

Sorted array of decimal strings:
0  0.01  3.14  4.0  5.6  12.3  456.0  789.1  

*/

 

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