/**
* 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);
}