Counting the occurence of a word within a string: Benchmark

I added this article because when I was only trying to look up how to do this, this nut "the Storyteller" went and carried out a benchmark test on the most popular ways of counting the occurrence of a specific word within a string of text.

Source: http://hasin.wordpress.com/2007/04/30/c … functions

<?
function microtime_float() {
     list($usec, $sec) = explode(��� ���, microtime());
     return ((float)$usec + (float)$sec);
}
$str = ���I have three PHP books, first one is ���PHP Tastes Good���, next is ���PHP in your breakfast��� and the last one is ���PHP Nightmare������;

$start = microtime_float();
for ($i=0; $i<10000; $i++) {
     $cnt = count(split(���PHP���,$str))-1;
}
$end = microtime_float();
echo ���Count by Split+Count took : ���.($end-$start).���Seconds���;

$start = microtime_float();
for ($i=0; $i<10000; $i++)
{
     preg_match_all(���/php/i���,$str,$matches);
     
     $cnt = count($matches[0]);
     
}
$end = microtime_float();
echo ���Count by Preg_Match+Count took : ���.($end-$start).��� Seconds\n���;
     
$start = microtime_float();
     
for ($i=0; $i<10000; $i++)
{
     
     str_replace(���PHP���,���PP���,$str,$cnt);
     //echo $cnt;
}
$end = microtime_float();
     
echo ���Count by str_replace took : ���.($end-$start).��� Seconds\n���;
     
$start = microtime_float();
     
for ($i=0; $i<10000; $i++)
{
     str_ireplace(���PHP���,���PP���,$str,$cnt);
     
     //echo $cnt;
}
$end = microtime_float();
echo ���Count By str_ireplace took : ���.($end-$start).��� Seconds\n���;
     
$start = microtime_float();
     
for ($i=0; $i<10000; $i++)
{
     
     $cnt = count(explode(���PHP���,$str))-1;
     //echo $cnt;
}
$end = microtime_float();
     
echo ���Count By Explode+Count took : ���.($end-$start).��� Seconds\n���;
     
$start = microtime_float();
     
for ($i=0; $i<10000; $i++)
{
     $word_count = (array_count_values(str_word_count(strtolower($str),1)));     
     
     ksort($word_count);
     
     $cnt = $word_count['php'];
}
$end = microtime_float();
echo ���Count By Array Functions took : ���.($end-$start).��� Seconds\n���;
     
$start = microtime_float();
for ($i=0; $i<10000; $i++)
     
{
     $cnt = count(preg_split(���/PHP/i���,$str))-1;
}
$end = microtime_float();
     
echo ���Count By preg_split+Count took : ���.($end-$start).��� Seconds\n���;
     
$start = microtime_float();
for ($i=0; $i<10000; $i++)
{
     
     $cnt = substr_count($str, ���PHP���);
}
$end = microtime_float();
echo ���Count By substr_count took : ���.($end-$start).��� Seconds\n���;
     
?>

And the result is

First Run

• Count by Split+Count took : 0.44112181663513 Seconds
• Count by Preg_Match+Count took : 0.46423101425171 Seconds
• Count by str_replace took : 0.23512482643127 Seconds
• Count By str_ireplace took : 0.39766597747803 Seconds
• Count By Explode+Count took : 0.25045800209045 Seconds
• Count By Array Functions took : 1.1077101230621 Seconds
• Count By preg_split+Count took : 0.30741000175476 Seconds
• Count By substr_count took : 0.21060705184937 Seconds

Second Run

• Count by Split+Count took : 0.68125295639038 Seconds
• Count by Preg_Match+Count took : 0.60020899772644 Seconds
• Count by str_replace took : 0.2877471446991 Seconds
• Count By str_ireplace took : 0.47500586509705 Seconds
• Count By Explode+Count took : 0.31055402755737 Seconds
• Count By Array Functions took : 1.3551599979401 Seconds
• Count By preg_split+Count took : 0.40205383300781 Seconds
• Count By substr_count took : 0.24432802200317 Seconds

Third Run

• Count by Split+Count took : 0.50134515762329 Seconds
• Count by Preg_Match+Count took : 0.53588891029358 Seconds
• Count by str_replace took : 0.25469994544983 Seconds
• Count By str_ireplace took : 0.34696006774902 Seconds
• Count By Explode+Count took : 0.23176002502441 Seconds
• Count By Array Functions took : 1.0504789352417 Seconds
• Count By preg_split+Count took : 0.28686618804932 Seconds
• Count By substr_count took : 0.20796585083008 Seconds

Fourth Run

• Count by Split+Count took : 0.4736020565033 Seconds
• Count by Preg_Match+Count took : 0.48813104629517 Seconds
• Count by str_replace took : 0.29280996322632 Seconds
• Count By str_ireplace took : 0.51396799087524 Seconds
• Count By Explode+Count took : 0.34470105171204 Seconds
• Count By Array Functions took : 1.4177949428558 Seconds
• Count By preg_split+Count took : 0.36489319801331 Seconds
• Count By substr_count took : 0.27841401100159 Seconds

 

If you are interested to know the machine configuration, these tests ran on a Celeron 1.6GHz processor based laptop with 768 MB of RAM. And I am using PHP 5.1.1

Source: http://hasin.wordpress.com/2007/04/30/c … functions