PHPWind与Discuz截取字符函数substrs与cutstr性能比较_PHP
PHPwind
以掌握使用Benchmark_Iterate类工具的方法。目录
一,什么是PEAR与Benchmark
二,性能比较代码准备与调试
三,性能比较测试结果
四,性能比较测试总结
五,附性能比较源代码下载
一,什么是PEAR与Benchmark
请参考PHP性能优化系列
第二期 PHP性能优化工具篇Benchmark类调试执行时间
第一期 PHP性能优化准备篇图解PEAR安装
二,性能比较代码准备与调试
测试环境说明
操作系统:Windows xp Service Pack 3
PHP版本:PHP Version 5.2.11
Apache版本:Apache 2.0 Handler
第一步,下载phpwind与discuz!程序源代码
1,下载 phpwind v7.5sp3 论坛版 安装包:简体 GBK
2,下载 Discuz! 7.2_FULL(含UCenter) 简体GBK
第二步,分别获取两个程序的截取字符函数substrs()和cutstr(),其中PHPWind截取字符函数substrs()由两个函数组成,分别是substrs与utf8_trim函数。
复制代码 代码如下:
function substrs($content,$length,$add='Y'){
if (strlen($content)>$length) {
if ($GLOBALS['db_charset']!='utf-8') {
$retstr = '';
for ($i=0;$i$retstr .= ord($content[$i]) > 127 ? $content[$i].$content[++$i] : $content[$i];
}
return $retstr.($add=='Y' ? ' ..' : '');
}
return utf8_trim(substr($content,0,$length)).($add=='Y' ? ' ..' : '');
}
return $content;
}
function utf8_trim($str) {
$hex = '';
$len = strlen($str)-1;
for ($i=$len;$i>=0;$i-=1) {
$ch = ord($str[$i]);
$hex .= " $ch";
if (($ch & 128)==0 || ($ch & 192)==192) {
return substr($str,0,$i);
}
}
return $str.$hex;
}
function cutstr($string, $length, $dot = ' ...') {
global $charset;
if(strlen($string) return $string;
}
$string = str_replace(array('&', '"', ''), array('&', '"', ''), $string);
$strcut = '';
if(strtolower($charset) == 'utf-8') {
$n = $tn = $noc = 0;
while($n $t = ord($string[$n]);
if($t == 9 || $t == 10 || (32 $tn = 1; $n++; $noc++;
} elseif(194 $tn = 2; $n += 2; $noc += 2;
} elseif(224 $tn = 3; $n += 3; $noc += 2;
} elseif(240 $tn = 4; $n += 4; $noc += 2;
} elseif(248 $tn = 5; $n += 5; $noc += 2;
} elseif($t == 252 || $t == 253) {
$tn = 6; $n += 6; $noc += 2;
} else {
$n++;
}
if($noc >= $length) {
break;
}
}
if($noc > $length) {
$n -= $tn;
}
$strcut = substr($string, 0, $n);
} else {
for($i = 0; $i $strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
}
}
$strcut = str_replace(array('&', '"', ''), array('&', '"', ''), $strcut);
return $strcut.$dot;
}
第三步,编写使用PEAR Benchmark_Iterate类调试的代码
复制代码 代码如下:
require_once "Benchmark/Iterate.php";
$bench = new Benchmark_Iterate;
$charset = $GLOBALS['db_charset'] = 'gbk';//utf-8
$content = "今年春晚,我特地关注了赵本山的新小品《捐助》,这篇小品对弱势群体的不尊重并无改变,小品讲的是赵本山与其弟子扮演两个捐助者...";
/*phpwind*/
$bench->run(50,"substrs",$content,30);
/*discuz*/
//$bench->run(50,"cutstr",$content,30);
$result = $bench->get();
?>
分别切换substrs和cutstr两个函数并且调用50次获取两个函数执行的平均时间。
三,性能比较测试结果
1,PHPWind程序substrs函数当截取字符编码为GBK的情况

图解:PHPWind程序substrs函数截取GBK编码的字符平均时间在0.0014s-0.0015s之间,纵坐标表示执行的时间,横坐标表示执行的次数,图表中mean表示平均执行时间,注s表示秒
2,Discuz!程序cutstr函数当截取字符编码为GBK的情况

图解:Discuz!程序cutstr函数截取GBK编码的字符平均时间在0.0016s-0.0018s之间
3,PHPWind程序substrs函数当截取字符编码为UTF-8的情况
图解:PHPWind程序substrs函数截取UTF-8编码的字符平均时间在0.001s-0.0012s之间
4,Discuz!程序cutstr函数当截取字符编码为UTF-8的情况
图解:Discuz!程序cutstr函数截取UTF-8编码的字符平均时间在0.0044s-0.0052s之间
四,性能比较测试总结
如上使用PEAR的Benchmark_Iterate类比较了两个截取字符函数的执行性能,在实际的代码开发过程中,为了保证代码的效率与性能,我们可以采取同样的方法来分析函数的执行性能或问题,这个非常有用!
本文通过比较PHPWind与Discuz两个社区论坛产品的截取字符函数substrs与cutstr的执行性能情况为例,谈谈PEAR Benchmark_Iterate类在实际开发中的应用,请继续关注下期的PHP性能优化系列。

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