I do lots of string concatenation in code and then I display output. I was wondering if there is any difference between following two codes:
$str = '';
for($x =0; $x <= 10000; $x++):
$str .= 'I am string '. $x . "\n";
endforeach;
ob_start();
for($x =0; $x <= 10000; $x++):
echo 'I am string ', $x , "\n";
endforeach;
$str = ob_get_contents();
ob_end_flush();
Here's a benchmark for you:
<?php
$test_1_start = microtime();
$str = '';
for ( $x = 0; $x <= 10000; $x++ ) {
$str .= 'I am string ' . $x . "\n";
}
$test_1_end = microtime();
unset($str);
echo 'String concatenation: ' . ( $test_1_end - $test_1_start ) . ' seconds';
$test_2_start = microtime();
ob_start();
for ( $x = 0; $x <= 10000; $x++ ) {
echo 'I am string ', $x, "\n";
}
$str = ob_get_contents();
ob_end_clean();
$test_2_end = microtime();
echo "\nOutput buffering: " . ( $test_2_end - $test_2_start ) . ' seconds';
?>
My results:
$ php -v
PHP 5.3.4 (cli) (built: Dec 15 2010 12:15:07)
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
$ php test.php
String concatenation: 0.003932 seconds
Output buffering: 0.002841 seconds%
$ php test.php
String concatenation: 0.004179 seconds
Output buffering: 0.002796 seconds%
$ php test.php
String concatenation: 0.006768 seconds
Output buffering: 0.002849 seconds%
$ php test.php
String concatenation: 0.004925 seconds
Output buffering: 0.002764 seconds%
$ php test.php
String concatenation: 0.004066 seconds
Output buffering: 0.002792 seconds%
$ php test.php
String concatenation: 0.004049 seconds
Output buffering: 0.002837 seconds%
Looks like output buffering + echo
is consistently faster, at least in the CLI / on my machine.
Brendan Long made a good point in his comment, however — there is such a minor performance difference here that a choice of one or the other is not much of an issue.
I've made a benchmark, using OB is faster.
String: 0.003571 seconds
Output Buffer: 0.003053 seconds
StringBuilder (custom class Java/C#-Like): 0.050148 seconds
Array and Implode: 0.006248 seconds
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With