php等比例縮放圖片及剪下圖片代碼分享_php執行個體

php等比例縮放圖片及剪下圖片代碼分享

/** * 圖片縮放函數（可設定高度固定，寬度固定或者最大寬高，支援gif/jpg/png三種類型） * Author : Specs * * @param string $source_path 源圖片 * @param int $target_width 目標寬度 * @param int $target_height 目標高度 * @param string $fixed_orig 鎖定寬高（選擇性參數 width、height或者空值） * @return string */function myImageResize($source_path, $target_width = 200, $target_height = 200, $fixed_orig = ''){  $source_info = getimagesize($source_path);  $source_width = $source_info[0];  $source_height = $source_info[1];  $source_mime = $source_info['mime'];  $ratio_orig = $source_width / $source_height;  if ($fixed_orig == 'width'){    //寬度固定    $target_height = $target_width / $ratio_orig;  }elseif ($fixed_orig == 'height'){    //高度固定    $target_width = $target_height * $ratio_orig;  }else{    //最大寬或最大高    if ($target_width / $target_height > $ratio_orig){      $target_width = $target_height * $ratio_orig;    }else{      $target_height = $target_width / $ratio_orig;    }  }  switch ($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, $target_height);  imagecopyresampled($target_image, $source_image, 0, 0, 0, 0, $target_width, $target_height, $source_width, $source_height);  //header('Content-type: image/jpeg');  $imgArr = explode('.', $source_path);  $target_path = $imgArr[0] . '_new.' . $imgArr[1];  imagejpeg($target_image, $target_path, 100);}

用法：

1. myImageResize($filename, 200, 200); //最大寬高
2. myImageResize($filename, 200, 200, 'width'); //寬度固定
3. myImageResize($filename, 200, 200, 'height'); //高度固定
   

剪下圖片為固定大小：

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 / $target_width;    // 源圖過高  if ($source_ratio > $target_ratio){    $cropped_width = $source_width;    $cropped_height = $source_width * $target_ratio;    $source_x = 0;    $source_y = ($source_height - $cropped_height) / 2;  }elseif ($source_ratio < $target_ratio){ // 源圖過寬    $cropped_width = $source_height / $target_ratio;    $cropped_height = $source_height;    $source_x = ($source_width - $cropped_width) / 2;    $source_y = 0;  }else{ // 源圖適中    $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, $cropped_height);  // 縮放  imagecopyresampled($target_image, $cropped_image, 0, 0, 0, 0, $target_width, $target_height, $cropped_width, $cropped_height);  $dotpos = strrpos($source_path, '.');  $imgName = substr($source_path, 0, $dotpos);  $suffix = substr($source_path, $dotpos);  $imgNew = $imgName . '_small' . $suffix;  imagejpeg($target_image, $imgNew, 100);  imagedestroy($source_image);  imagedestroy($target_image);  imagedestroy($cropped_image);}

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