这篇文章主要介绍了PHP实现批量生成App各种尺寸Logo的方法和示例的核心代码，非常的简单实用，这里推荐给小伙伴们，有需要的可以参考下。

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:

<?php

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;

}

}

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