Looping vs Padding

<?php

// Function to generate a random number using the first method
function unique_keygen_meth_looping() {
    $member_id = '';
    for ($i = 0; $i < 10; $i++) {
        $member_id .= mt_rand(0, 9);
    }
    return '10000' . $member_id;
}

// Function to generate a random number using the second method
function unique_keygen_meth_padding() {
    $member_id = '10000' . str_pad(mt_rand(0, 9999999999), 10, '0', STR_PAD_LEFT);
    return $member_id;
}

// Measure execution time for the first method
$startTime1 = microtime(true);
for ($i = 0; $i < 100000; $i++) {
    unique_keygen_meth_looping();
}
$endTime1 = microtime(true);
$executionTime1 = $endTime1 - $startTime1;

// Measure execution time for the second method
$startTime2 = microtime(true);
for ($i = 0; $i < 100000; $i++) {
    unique_keygen_meth_padding();
}
$endTime2 = microtime(true);
$executionTime2 = $endTime2 - $startTime2;

// Output the results
echo "Execution time for Method 1 (Looping): " . $executionTime1 . " seconds\n";
echo "Execution time for Method 2 (Padding): " . $executionTime2 . " seconds\n";

// Compare the execution times and determine which method is faster
if ($executionTime1 < $executionTime2) {
    echo "Looping is faster than Padding\n";
} elseif ($executionTime1 > $executionTime2) {
    echo "Padding is faster than Looping\n";
} else {
    echo "Both methods have the same execution time\n";
}

// Compare the execution times and determine which method is faster and by what percentage
if ($executionTime1 < $executionTime2) {
    $percentageFaster = (int) ((($executionTime2 - $executionTime1) / $executionTime2) * 100);
    echo "Looping is faster than Padding by " . $percentageFaster . "%\n";
} elseif ($executionTime1 > $executionTime2) {
    $percentageFaster = (int) ((($executionTime1 - $executionTime2) / $executionTime1) * 100);
    echo "Padding is faster than Looping by " . $percentageFaster . "%\n";
} else {
    echo "Both methods have the same execution time\n";
}

?>