


The example of this article describes the image (thumbnail) processing class encapsulated by PHP. Share it with everyone for your reference, the details are as follows:
<?php //图片处理工具类 class Image{ //属性 private $thumb_width; //缩略图的宽 private $thumb_height; //错误属性 public $thumb_error; //构造方法 public function __construct($width = 0,$height = 0){ $this->thumb_width = ($width == 0) ? $GLOBALS['config']['admin_goods_thumb']['width'] : $width; $this->thumb_height = ($height == 0) ? $GLOBALS['config']['admin_goods_thumb']['height'] : $height; } /* * 制作缩略图 * @param1 string $src,原图路径,/uploads/20150122101010abcdef.gif * @param2 string $path,缩略图保存路径/uploads/thumb_20150122101010abcdef.gif * @return 缩略图的名字 */ public function makeThumb($src,$path){ //判断原图是否存在 if(!file_exists($src)){ $this->thumb_error = '原图不存在!'; return false; } //打开原图资源 //获取能够使用的后缀 $ext = $this->getFunctionName($src); //gif //拼凑函数名 $open = 'imagecreatefrom' . $ext; //imagecreatefromgif $save = 'image' . $ext; //imagegif //如果不清楚;echo $open,$save;exit; //可变函数打开原图资源 $src_img = $open($src); //利用可变函数打开图片资源 //imagecreatefromgif($src) //缩略图资源 $dst_img = imagecreatetruecolor($this->thumb_width,$this->thumb_height); //背景色填充白色 $dst_bg_color = imagecolorallocate($dst_img,255,255,255); imagefill($dst_img,0,0,$dst_bg_color); //宽高比确定宽高 $dst_size = $this->thumb_width / $this->thumb_height; //获取原图数据 $file_info = getimagesize($src); $src_size = $file_info[0]/$file_info[1]; //求出缩略图宽和高 if($src_size > $dst_size){ //原图宽高比大于缩略图 $width = $this->thumb_width; $height = round($width / $src_size); }else{ $height = $this->thumb_height; $width = round($height * $src_size); } //求出缩略图起始位置 $dst_x = round($this->thumb_width - $width)/2; $dst_y = round($this->thumb_height - $height)/2; //制作缩略图 if(imagecopyresampled($dst_img,$src_img,$dst_x,$dst_y,0,0,$width,$height,$file_info[0],$file_info[1])){ //采样成功:保存,将文件保存到对应的路径下 $thumb_name = 'thumb_' . basename($src); $save($dst_img,$path . '/' . $thumb_name); //保存成功 return $thumb_name; }else{ //采样失败 $this->thumb_error = '缩略图采样失败!'; return false; } } /* * 获取文件要调用的函数名 * @param1 string $file,文件名字 * @return 通过文件后缀名得到的函数字符串 */ private function getFunctionName($file){ //得到文件的后缀 $file_info = pathinfo($file); $ext = $file_info['extension']; //后缀:gif,png,jpg,jpeg,pjpeg //imagecreatefromgif,imagecreatefromjpeg,imagecreatefrompng //定义一个数组保存函数名 $func = array( 'gif' => 'gif', 'png' => 'png', 'jpg' => 'jpeg', 'jpeg' => 'jpeg', 'pjpeg' => 'jpeg' ); //返回值 return $func[$ext]; } }
The above is the content of the complete example of the PHP encapsulated image (thumbnail) processing class, more For more related content, please pay attention to the PHP Chinese website (www.php.cn)!

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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