php method to generate thumbnails without distortion: 1. Create a PHP sample file; 2. Generate images in equal proportions through the "function reSizeImg($imgSrc, $resize_width...) {...}" method Thumbnails will do.
php How to generate thumbnails without distortion?
Use the PHP function to generate image thumbnails in equal proportions without distortion code//等比例生成圖片縮略圖不失真
/**
* 生成縮略圖
* $imgSrc 圖片源路徑
* $resize_width 圖片寬度
* $resize_height 圖片高度
* $dstimg 縮略圖路徑
* $isCut 是否剪切圖片
*/
function reSizeImg($imgSrc, $resize_width, $resize_height, $dstimg, $isCut = false) {
//圖片的類(lèi)型
$type = substr(strrchr($imgSrc, "."), 1);
//初始化圖象
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);
//生成圖象
//改變后的圖象的比例
$resize_ratio = ($resize_width) / ($resize_height);
//實(shí)際圖象的比例
$ratio = ($width) / ($height);
if (($isCut) == 1) {
if ($ratio >= $resize_ratio) {
//高度優(yōu)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) {
//寬度優(yōu)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);
}
$result = reSizeImg('images/15M.jpg', 1280, 1280,'thumb/xiao15.jpg'); Recommended learning: "PHP Video Tutorial"
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