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);