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三个PHP常用代码样例

作为一个正常的程序员,会好几种语言是十分正常的,相信大部分程序员也都会编写几句PHP程序,如果是WEB程序员,PHP一定是必备的。尽管PHP经常被人诟病,被人贬低,被人当玩笑开,事实证明,PHP是全世界网站开发中使用率最高的编程语言。PHP最大的缺点是太简单,语法不严谨,框架体系很弱,但这也是它最大的优点。

网上有人总结几种编程语言的特点:

PHP 就是: Quick and Dirty

Java 就是: Beauty and Slowly

Ruby 就是: Quick and Beauty

python 就是: Quick and Simple

 

一、随机颜色生成器

function randomColor() { 

    $str = ‘#‘; 

    for($i = 0 ; $i < 6 ; $i++) { 

        $randNum = rand(0 , 15); 

        switch ($randNum) { 

            case 10: $randNum = ‘A‘; break; 

            case 11: $randNum = ‘B‘; break; 

            case 12: $randNum = ‘C‘; break; 

            case 13: $randNum = ‘D‘; break; 

            case 14: $randNum = ‘E‘; break; 

            case 15: $randNum = ‘F‘; break; 

        } 

        $str .= $randNum; 

    } 

    return $str; 

$color = randomColor();

 

二、时间差异计算函数

function ago($time)

{

   $periods = array("second", "minute", "hour", "day", "week", "month", "year", "decade");

   $lengths = array("60","60","24","7","4.35","12","10");

   $now = time();

   $difference     = $now - $time;

   $tense         = "ago";

   for($j = 0; $difference >= $lengths[$j] && $j < count($lengths)-1; $j++) {

       $difference /= $lengths[$j];

   }

   $difference = round($difference);

   if($difference != 1) {

       $periods[$j].= "s";

   }

   return "$difference $periods[$j] ‘ago‘ ";

}

 

三、裁剪图片

$filename= "test.jpg";

list($w, $h, $type, $attr) = getimagesize($filename);

$src_im = imagecreatefromjpeg($filename);

 

$src_x = ‘0‘;   // begin x

$src_y = ‘0‘;   // begin y

$src_w = ‘100‘; // width

$src_h = ‘100‘; // height

$dst_x = ‘0‘;   // destination x

$dst_y = ‘0‘;   // destination y

 

$dst_im = imagecreatetruecolor($src_w, $src_h);

$white = imagecolorallocate($dst_im, 255, 255, 255);

imagefill($dst_im, 0, 0, $white);

imagecopy($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h);

header("Content-type: image/png");

imagepng($dst_im);

imagedestroy($dst_im);

 

三个PHP常用代码样例