What is the code for php image rotation direction?

php code method to realize the image rotation direction is: 1. Create a php sample file; 2. Through "public static function base64Rotate($image, $rotate = '90', $savePath = false){. ..}" method to set the base64 image rotation; 3. Set the local image rotation through the "imageRotate" method.

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.

What is the php image rotation direction code?

php realizes image rotation

Recently there is a requirement to rotate the image uploaded by the front end 90° counterclockwise. This mainly requires the use of php The imagerotate method rotates the image. The specific implementation method is as follows:

<?php
 
namespace common\traits;
 
use Yii;
use yii\helpers\FileHelper;
 
/**
 * 图片旋转处理trait
 *
 * @author wangjian
 * @since 1.0
 */
class ImageRotate
{
 
    /**
     * base64图片旋转
     * @param $image 需要旋转的base64图片
     * @param string $rotate 逆时针旋转角度
     * @param false $savePath 保存的图片路径,false返回base64格式
     */
    public static function base64Rotate($image, $rotate = &#39;90&#39;, $savePath = false)
    {
        if (empty($image)) {
            return false;
        }
        if (preg_match(&#39;/^(data:\s*image\/(\w+);base64,)/&#39;, $image, $result)) {
            $type = $result[2];
            //设置临时目录
            $temporaryPath = &#39;/tmp/&#39;;
            $temporaryPath = dirname(Yii::getAlias(&#39;@common&#39;)) . &#39;/web&#39; . $temporaryPath;
            FileHelper::createDirectory($temporaryPath);
 
            //将原图保存到零食目录
            $temporaryImage = date(&#39;YmdHis&#39;) . rand(1000, 9999) . &#39;.&#39; . $type;
            if (file_put_contents($temporaryPath . $temporaryImage, base64_decode(str_replace($result[1], &#39;&#39;, $image)))) {
                $newImage = self::rotateImage($temporaryPath . $temporaryImage, $rotate); //旋转图片
                //删除临时文件
                @unlink($temporaryPath . $temporaryImage);
 
                ob_start();
                if ($savePath === false) { //返回base
                    imagepng($newImage);
                    $imageString = $result[1] . base64_encode(ob_get_contents());
                    @unlink($newImage);
                } else {
                    $imageString = imagepng($newImage, $savePath);
                }
                ob_end_clean();
 
                return $imageString;
            }
        }
 
        return false;
    }
 
    /**
     * 本地图片旋转
     * @param $image 需要旋转的本地图片
     * @param string $rotate 逆时针旋转角度
     * @param false $savePath 保存的图片路径,false返回替换原图
     */
    public static function imageRotate($image, $rotate = &#39;90&#39;, $savePath = false)
    {
        if (empty($image)) {
            return false;
        }
        //旋转图片
        $newImage = self::rotateImage($image, $rotate);
        ob_start();
        if ($savePath === false) {
            //替换原图
            $url = $image;
        } else {
            $url = $savePath;
        }
        $imageString = imagepng($newImage, $url);
        ob_end_clean();
        return $imageString;
    }
 
    /**
     * @param $file 需要旋转的图片
     * @param $rotate 逆时针旋转角度
     */
    private static function rotateImage($file, $rotate)
    {
        $imageSize = getimagesize($file);
        $imageSize = explode(&#39;/&#39;, $imageSize[&#39;mime&#39;]);
        $type = $imageSize[1];
 
        switch ($type) {
            case "png":
                $image = imagecreatefrompng($file);
                break;
            case "jpeg":
                $image = imagecreatefromjpeg($file);
                break;
            case "jpg":
                $image = imagecreatefromjpeg($file);
                break;
            case "gif":
                $image = imagecreatefromgif($file);
                break;
        }
        $rotateImage = imagerotate($image, $rotate, 0); //逆时针旋转
        //获取旋转后的宽高
        $srcWidth = imagesx($rotateImage);
        $srcHeight = imagesy($rotateImage);
        //创建新图
        $newImage = imagecreatetruecolor($srcWidth, $srcHeight);
        //分配颜色 + alpha，将颜色填充到新图上
        $alpha = imagecolorallocatealpha($newImage, 0, 0, 0, 127);
        imagefill($newImage, 0, 0, $alpha);
        //将源图拷贝到新图上，并设置在保存 PNG 图像时保存完整的 alpha 通道信息
        imagecopyresampled($newImage, $rotateImage, 0, 0, 0, 0, $srcWidth, $srcHeight, $srcWidth, $srcHeight);
        imagesavealpha($newImage, true);
 
        return $newImage;
    }
 
}

Specific use:

1: Base64 image rotation and output base64

ImageRotate::base64Rotate('base64图片', '旋转角度');

2: Base64 image rotation and save

ImageRotate::base64Rotate('base64 image', 'rotation angle', 'save address');

3: Local image rotation

ImageRotate::imageRotate('本地图片地址', '旋转角度', '保存地址');

According to the above method we You can realize the image rotation function

Recommended learning: "PHP Video Tutorial"

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