/**
* @param $img 图片地址
* @param string $width 宽
* @param string $height 高
* @param string $ratio 保持原比例
* @return string 生成的地址
*/
public function resize_fuc($img, $width, $height, $ratio)
{
$info = get_img_info($img);
$name = pathinfo($img)['filename'];
$dirname = pathinfo($img)['dirname'];
$ext = pathinfo($img)['extension'];
$im = NULL;
$type = strtolower($info['type']);
if (!in_array($type, ['jpg', 'jpeg', 'gif', 'png'])) {
return FALSE;
}
$type = ($type == 'jpg' ? 'jpeg' : $type);
$scale = $info['width'] / $info['height'];
if ($ratio == TRUE) {
$forScale = $width / $height;
$x = 0;
$y = 0;
if ($scale >= $forScale) {
$width = (int)($height * $scale);
$rate = $info['height']/$height;
} else {
$height = (int)($width / $scale);
$rate = $info['width']/$width;
}
} else {
$forScale = $width / $height;
if ($scale >= $forScale) {
$x = ($info['width'] - $info['height'] * $forScale) / 2;
$y = 0;
$rate = $info['height'] / $height;
} else {
$x = 0;
$y = ($info['height'] - $info['width'] / $forScale) / 2;
$rate = $info['width'] / $width;
}
}
if($width>$info['width'] || $height>$info['height']){
return;
}
$imageCreateFun = 'imagecreatefrom' . $type;
$im = $imageCreateFun($img);
$thumb = $dirname . '/' . $name . '_tmp' . "." . $ext;
$imageFun = 'image' . $type;
$imageFun($im, $thumb);
$thumbNew = imagecreatetruecolor($width, $height);
imagecopyresampled(
$thumbNew, $im,
0, 0, intval($x), intval($y),
intval($width * 1), intval($height * 1), intval($width * $rate), intval($height * $rate)
);
$imageFun($thumbNew, $thumb);
imagedestroy($im);
imagedestroy($thumbNew);
rename($thumb,$img);
return $img;
}
function get_img_info($img) {
if(!is_file($img) || !in_array(strtolower(pathinfo($img)['extension']),['jpg','jpeg','bmp','gif','png'])){
return false;
}
$img_info = getimagesize($img);
if ($img_info !== false) {
$img_type = strtolower(substr(image_type_to_extension($img_info[2]), 1));
$info = array("width" => $img_info[0], "height" => $img_info[1], "type" => $img_type, "mime" => $img_info['mime'], );
return $info;
} else {
return false;
}
}
)
