Benchmarking PHP exception throws and backtrace generation

bench.log

$ php bench.php 
Throwing: 0.060640
Assigning and throwing: 0.064791
Assigning once and throwing: 0.011064

bench.php

<?php

echo "Throwing: ";

$s = microtime(true);

for ($i = 0; $i < 100000; $i++) {
    try {
        throw new Exception;
    } catch (Exception $_) {}
}

printf("%0.6f\n", (microtime(true) - $s));



echo "Assigning and throwing: ";

$s = microtime(true);

for ($i = 0; $i < 100000; $i++) {
    try {
        $e = new Exception;
        throw $e;
    } catch (Exception $_) {}
}

printf("%0.6f\n", (microtime(true) - $s));



echo "Assigning once and throwing: ";

$s = microtime(true);

$e = new Exception;
for ($i = 0; $i < 100000; $i++) {
    try {
        throw $e;
    } catch (Exception $_) {}
}

printf("%0.6f\n", (microtime(true) - $s));