Use PHP’s built-in Math function with caution_PHP Tutorial

This article introduces in detail some issues in the use process of PHP's built-in Math function. I hope these methods will be helpful to you. ​

As shown in the title. . . I haven't done any large-scale calculations, so I don't know yet. . . Damn, PHP's Math function operation turns out to be so slow. . . It’s better for everyone to go to trouble and write a few more sentences by hand~~~

Waiter! Up code. . . .

代码如下	复制代码
$start = microtime(TRUE);   for ($i=0; $i < 200000; $i++)   {       $s = 0;       for ($j=0; $j < 3; $j++)       {           $s += ($j+$i+1) * ($j+$i+1);       }   }   echo microtime(TRUE) – $start;   # output: 0.33167719841003

Compare the code and results using the Math function

代码如下	复制代码
$start = microtime(TRUE);   for ($i=0; $i < 200000; $i++)   {       $s = 0;       for ($j=0; $j < 3; $j++)       {           $s += pow($j+$i+1, 2);       }   }   echo microtime(TRUE) – $start;   # output: 0.87528896331787

Seeing that there is no problem, the efficiency is increased by 100%. . . In the past, I always thought that it was PHP's built-in Math speed, but I didn't know it was unexpected. . For example, taking absolute value abs, maximum value max, minimum value min, etc. are not as efficient as the original if judgment~~

In general, PHP calculations are indeed very slow~~ It is really not suitable for large-scale algorithm calculations~~

http://www.bkjia.com/PHPjc/445619.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/445619.htmlTechArticleThis article introduces in detail some problems in using the built-in Math function in PHP. I hope these methods will be helpful to you. . As the title indicates. . . I haven't done any large-scale calculations, so I don't know yet. . . ...