note 99216 modified in language.operators.comparison by felipe
| From: | felipe@php.net | Date: | Thu, 05 Aug 2010 01:24:22 +0000 |
| Subject: | note 99216 modified in language.operators.comparison by felipe | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-171373@lists.php.net to get a copy of this message | ||
I prefer writing (!$a == 'hello') much more than ($a != 'hello'), but I wondered
about the performance.
So I did a benchmark:
<?php
for($bench = 0; $bench < 3; $bench++)
{
$start = microtime(true);
$a = 1;
for($i = 0; $i < 100000000; $i++)
{
if(!$a == 'hello') $b++;
}
$end = microtime(true);
echo "Used time: " . ($end-$start) . "\n";
}
?>
and it results with
# if($a != 'hello')
Used time: 12.552895069122
Used time: 12.548940896988
Used time: 12.470285177231
# if(!$a == 'hello')
Used time: 7.6532161235809
Used time: 7.6426539421082
Used time: 7.6452689170837
--was--
I prefer writing (!$a == 'hello') much more than ($a != 'hello'), but I wondered
about the performance.
So I did a benchmark:
for($bench = 0; $bench < 3; $bench++)
{
$start = microtime(true);
$a = 1;
for($i = 0; $i < 100000000; $i++)
{
if(!$a == 'hello') $b++;
}
$end = microtime(true);
echo "Used time: " . ($end-$start) . "\n";
}
and it results with
# if($a != 'hello')
Used time: 12.552895069122
Used time: 12.548940896988
Used time: 12.470285177231
# if(!$a == 'hello')
Used time: 7.6532161235809
Used time: 7.6426539421082
Used time: 7.6452689170837
http://php.net/manual/en/language.operators.comparison.php