PHP: One big echo (or print) VS many small echo (or print)

Question

I should echo a table with 1000 rows of data, can I echo all the data in one string or is it better to echo a row per time?

Answer 1

According to http://phplens.com/lens/php-book/optimizing-debugging-php.php (see last third of article) you should use one big echo statement, and use single quotes instead of double quotes, so PHP hasn´t to check for variables within the string.

simple test for support:

$bgn = microtime(true);
for ($i=0; $i<=1000; $i++)
{
  echo $i;
}
echo "\n", round(microtime(true)-$bgn, 4), "\n";
unset($bgn);
$bgn = microtime(true);
$b = '';
for ($i=0; $i<=1000; $i++)
{
  $b.=$i;
}
echo $b;
echo "\n", round(microtime(true)-$bgn, 4), "\n";
?>

First run return 0.0022, while second run return 0.0007 ... however this is small set of data, memory usage is quite small.