/**

* 生成缩略图

* $imgSrc图片源路径

* $resize_width图片宽度

* $resize_height图片高度

* $dstimg缩略图路径

* $isCut是否剪切图片

*/

public function reSizeImg($imgSrc, $resize_width, $resize_height, $dstimg, $isCut = false) {

//图片的类型

$type = substr(strrchr($imgSrc, "."), 1);

//初始化图象

if ($type == "jpg" || $type == "jpeg") {

$im = imagecreatefromjpeg($imgSrc);

}

if ($type == "gif") {

$im = imagecreatefromgif($imgSrc);

}

if ($type == "png") {

$im = imagecreatefrompng($imgSrc);

}

$width = imagesx($im);

$height = imagesy($im);

//生成图象

//改变后的图象的比例

$resize_ratio = ($resize_width) / ($resize_height);

//实际图象的比例

$ratio = ($width) / ($height);

if (($isCut) == 1) {

if ($ratio >= $resize_ratio) {

//高度优先

$newimg = imagecreatetruecolor($resize_width, $resize_height);

imagecopyresampled($newimg, $im, 0, 0, 0, 0, $resize_width, $resize_height, (($height) * $resize_ratio), $height);

ImageJpeg($newimg, $dstimg);

}

if ($ratio < $resize_ratio) {

//宽度优先

$newimg = imagecreatetruecolor($resize_width, $resize_height);

imagecopyresampled($newimg, $im, 0, 0, 0, 0, $resize_width, $resize_height, $width, (($width) / $resize_ratio));

ImageJpeg($newimg, $dstimg);

}

} else {

if ($ratio >= $resize_ratio) {

$newimg = imagecreatetruecolor($resize_width, ($resize_width) / $ratio);

imagecopyresampled($newimg, $im, 0, 0, 0, 0, $resize_width, ($resize_width) / $ratio, $width, $height);

ImageJpeg($newimg, $dstimg);

}

if ($ratio < $resize_ratio) {

$newimg = imagecreatetruecolor(($resize_height) * $ratio, $resize_height);

imagecopyresampled($newimg, $im, 0, 0, 0, 0, ($resize_height) * $ratio, $resize_height, $width, $height);

ImageJpeg($newimg, $dstimg);

}

}

ImageDestroy($im);

}