使用php gd，使用良好，一键剪裁各种尺寸，打包下载。经常换icon的懂的，美工给你一个1024的logo，你得ps出各种尺寸，于是有了这个东西。
核心代码
代码如下:
class image {
/**
* source image
*
* @var string|array
*/
private $source;
/**
* temporay image
*
* @var file
*/
private $image;
private $ext;
/**
* erros
*
* @var array
*/
private $error;
/**
* construct
*
* @param string|array $source
*/
public function __construct($source = null) {
if($source != null) {
$this->source($source);
}
}
/**
* set the source image
*
* @param string|array $source
*/
public function source($source) {
if(!is_array($source)) {
$this->source[name] = $source;
$this->source[tmp_name] = $source;
$type = null;
$ext = strtolower(end(explode(.,$source)));
switch($ext) {
case jpg :
case jpeg : $type = image/jpeg; break;
case gif : $type = image/gif; break;
case png : $type = image/png; break;
}
$this->source[type] = $type;
} else {
$this->source = $source;
}
$this->destination = $this->source[name];
}
/**
* resize the image
*
* @param int $width
* @param int $height
*/
public function resize($width = null,$height = null) {
if(isset($this->source[tmp_name]) && file_exists($this->source[tmp_name])) {
list($source_width,$source_height) = getimagesize($this->source[tmp_name]);
if(($width == null) && ($height != null)) {
$width = ($source_width * $height) / $source_height;
}
if(($width != null) && ($height == null)) {
$height = ($source_height * $width) / $source_width;
}
if(($width == null) && ($height == null)) {
$width = $source_width;
$height = $source_height;
}
switch($this->source[type]) {
case image/jpeg : $created = imagecreatefromjpeg($this->source[tmp_name]); break;
case image/gif : $created = imagecreatefromgif($this->source[tmp_name]); break;
case image/png : $created = imagecreatefrompng($this->source[tmp_name]); break;
}
$this->image = imagecreatetruecolor($width,$height);
imagecopyresampled($this->image,$created,0,0,0,0,$width,$height,$source_width,$source_height);
}
}
/**
* add watermark on image
*
* @param string $mark
* @param int $opac
* @param int $x_pos
* @param int $y_pos
*/
public function watermark($mark,$opac,$x_pos,$y_pos) {
if(file_exists($mark) && ($this->image != )) {
$ext = strtolower(end(explode(.,$mark)));
switch($ext) {
case jpg :
case jpeg : $watermark = imagecreatefromjpeg($mark); break;
case gif : $watermark = imagecreatefromgif($mark); break;
case png : $watermark = imagecreatefrompng($mark); break;
}
list($watermark_width,$watermark_height) = getimagesize($mark);
$source_width = imagesx($this->image);
$source_height = imagesy($this->image);
if($x_pos == top) $pos = t; else $pos = b;
if($y_pos == left) $pos .= l; else $pos .= r;
$dest_x = 0;
$dest_y = 0;
switch($pos) {
case tr : $dest_x = $source_width - $watermark_width; break;
case bl : $dest_y = $source_height - $watermark_height; break;
case br : $dest_x = $source_width - $watermark_width; $dest_y = $source_height - $watermark_height; break;
}
imagecopymerge($this->image,$watermark,$dest_x,$dest_y,0,0,$watermark_width,$watermark_height,$opac);
}
}
/**
* crop the image
*
* @param int $x
* @param int $y
* @param int $width
* @param int $height
*/
public function crop($x,$y,$width,$height) {
if(isset($this->source[tmp_name]) && file_exists($this->source[tmp_name]) && ($width > 10) && ($height > 10)) {
switch($this->source[type]) {
case image/jpeg : $created = imagecreatefromjpeg($this->source[tmp_name]); break;
case image/gif : $created = imagecreatefromgif($this->source[tmp_name]); break;
case image/png : $created = imagecreatefrompng($this->source[tmp_name]); break;
}
$this->image = imagecreatetruecolor($width,$height);
imagecopy($this->image,$created,0,0,$x,$y,$width,$height);
}
}
/**
* create final image file
*
* @param string $destination
* @param int $quality
*/
public function create($destination,$quality = 100) {
if($this->image != ) {
$extension = substr($destination,-3,3);
switch($extension) {
case gif :
imagegif($this->image,$destination,$quality);
break;
case png :
$quality = ceil($quality/10) - 1;
imagepng($this->image,$destination,$quality);
break;
default :
imagejpeg($this->image,$destination,$quality);
break;
}
}
}
/**
* check if extension is valid
*
*/
public function validate_extension() {
if(isset($this->source[tmp_name]) && file_exists($this->source[tmp_name])) {
$exts = array(image/jpeg, image/pjpeg, image/png, image/x-png);
$ext = $this->source[type];
$valid = 0;
$this->ext = '.not_found';
if ($ext == $exts[0] || $ext == $exts[1]) {
$valid = 1;
$this->ext = '.jpg';
}
// if ($ext == $exts[2]) {
// $valid = 1;
// $this->ext = '.gif';
// }
if ($ext == $exts[2] || $ext == $exts[3]) {
$valid = 1;
$this->ext = '.png';
}
if($valid != 1) {
$this->error .= extension;
}
} else {
$this->error .= source;
}
}
/**
* check if the size is correct
*
* @param int $max
*/
public function validate_size($max) {
if(isset($this->source[tmp_name]) && file_exists($this->source[tmp_name])) {
$max = $max * 1024;
if($this->source[size] >= $max) {
$this->error .= size;
}
} else {
$this->error .= source;
}
}
/**
* check if the dimension is correct
*
* @param int $limit_width
* @param int $limit_height
*/
public function validate_dimension($limit_width,$limit_height) {
if(isset($this->source[tmp_name]) && file_exists($this->source[tmp_name])) {
list($source_width,$source_height) = getimagesize($this->source[tmp_name]);
if(($source_width > $limit_width) || ($source_height > $limit_height)) {
$this->error .= dimension;
}
} else {
$this->error .= source;
}
}
/**
* get the found errors
*
*/
public function error() {
$error = array();
if(stristr($this->error,source)) $error[] = 找不到上传文件;
if(stristr($this->error,dimension)) $error[] = 上传图片尺寸太大;
if(stristr($this->error,extension)) $error[] = 不符合要求的格式;
if(stristr($this->error,size)) $error[] = 图片文件太大;
return $error;
}
public function error_string() {
$error = ;
if(stristr($this->error,source)) $error .= 找不到上传文件 / ;
if(stristr($this->error,dimension)) $error .= 上传图片尺寸太大 / ;
if(stristr($this->error,extension)) $error .= 不符合要求的格式 / ;
if(stristr($this->error,size)) $error .= 图片文件太大 / ;
if(eregi( / $, $error)) {
$error = substr($error, 0, -3);
}
return $error;
}
public function ext() {
return $this->ext;
}
}
以上就是本文所述的全部内容了，希望大家能够喜欢。