php 图像裁剪(自定义裁剪图片大小)

以你之姓@ 2023-09-28 14:46 168阅读 0赞

剪裁代码

<?php
    /**
    * 图像裁剪
    * @param $title string 原图路径
    * @param $content string 需要裁剪的宽
    * @param $encode string 需要裁剪的高
    */
    function imagecropper($source_path, $target_width, $target_height)
    {
        
    $source_info = getimagesize($source_path);
    $source_width = $source_info[0];
    $source_height = $source_info[1];
    $source_mime = $source_info['mime'];
    $source_ratio = $source_height / $source_width;
    $target_ratio = $target_height / $target_width;
    
    // 源图过高
    if ($source_ratio > $target_ratio)
    {
        
    $cropped_width = $source_width;
    $cropped_height = $source_width * $target_ratio;
    $source_x = 0;
    $source_y = ($source_height - $cropped_height) / 2;
    }
    // 源图过宽
    elseif ($source_ratio < $target_ratio)
    {
        
    $cropped_width = $source_height / $target_ratio;
    $cropped_height = $source_height;
    $source_x = ($source_width - $cropped_width) / 2;
    $source_y = 0;
    }
    // 源图适中
    else
    {
        
    $cropped_width = $source_width;
    $cropped_height = $source_height;
    $source_x = 0;
    $source_y = 0;
    }
    
    switch ($source_mime)
    {
        
    case 'image/gif':
    $source_image = imagecreatefromgif($source_path);
    break;
    
    case 'image/jpeg':
    $source_image = imagecreatefromjpeg($source_path);
    break;
    
    case 'image/png':
    $source_image = imagecreatefrompng($source_path);
    break;
    
    default:
    return false;
    break;
    }
    
    $target_image = imagecreatetruecolor($target_width, $target_height);
    $cropped_image = imagecreatetruecolor($cropped_width, $cropped_height);
    
    // 裁剪
    imagecopy($cropped_image, $source_image, 0, 0, $source_x, $source_y, $cropped_width, $cropped_height);
    // 缩放
    imagecopyresampled($target_image, $cropped_image, 0, 0, 0, 0, $target_width, $target_height, $cropped_width, $cropped_height);
    
    //保存图片到本地(两者选一)
    $randNumber = mt_rand(00000, 99999). mt_rand(000, 999);
    $fileName = substr(md5($randNumber), 8, 16) .".png";
    $new=imagepng($target_image,'../'.$fileName);
    imagedestroy($target_image);
    echo $fileName;
    
    //直接在浏览器输出图片(两者选一)
    // header('Content-Type: image/jpeg');
    // imagepng($target_image);
    // imagedestroy($target_image);
    // imagejpeg($target_image);
    // imagedestroy($source_image);
    // imagedestroy($target_image);
    // imagedestroy($cropped_image);
    }
    
    //调用
    //imagecropper('./img033.jpg',300,300);
    imagecropper('https://profile.csdnimg.cn/9/B/A/0_qq_35230125',140,140);
    //imagecropper('./img033.jpg',55,55);