Why is it important to replace commas with periods in numerical values when sorting arrays in PHP?

When sorting arrays in PHP, numerical values are compared as strings by default. If numerical values contain commas (for example, "1,000"), PHP will treat them as strings and sort them incorrectly. To ensure proper sorting, commas should be replaced with periods in numerical values before sorting the array. 

// Sample array with numerical values containing commas
$array = ["1,000", "500", "2,500", "1,200"];

// Replace commas with periods in numerical values
foreach ($array as $key => $value) {
    $array[$key] = str_replace(",", ".", $value);
}

// Sort the array
sort($array);

// Output the sorted array
print_r($array);

Keywords

sorting arrays PHP numerical values periods

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