这篇文章主要为大家详细介绍了如何基于PHP封装图片裁剪工具类,文中的示例代码讲解详细,具有一定的借鉴价值,感兴趣的小伙伴可以跟随小编一起学习一下 
PHP工具类图片裁剪类封装
<?phpnamespace App\Utils; /** * 图片裁剪工具类 * @author田小涛 * @date2020年7月23日 * @comment * */class ImageCropUtils{ private $sImage; private $dImage; private $src_file; private $dst_file; private $src_width; private $src_height; private $src_ext; private $src_type; private $mime; //上传基础路径处 private $basisUploadPath; public function __construct( $file = null, $distFile = null ) { $this->dst_file = $distFile; $this->basisUploadPath = storage_path( 'app/uploads/' ); if( isset( $file ) && $file ) { $this->src_file = $file; $this->init( $file ); } } /** * 生成唯一的文件名称 * @author Administrator * @datetime 2019年12月24日 上午11:44:02 * @comment * * @param string $salt * @return string */ protected function getUniqueDiskName($salt = '') { if( empty( $salt ) ) { $salt = mt_rand(1,1000000); } list($usec, $sec) = explode(" ", microtime()); $micros = str_replace('.', '', ((float)$usec + (float)$sec)).$salt; return md5( $micros ); } /** * 初始化参数 * @author Administrator * @datetime 2020年7月22日 下午3:00:22 * @comment * * @return boolean */ public function init( $url ) { $strExt = $this->getImgExt( $url ); $filename = $this->getUniqueDiskName( md5( $url ) ); $path = date( 'y' ) . '/' . date( 'm' ) . '/' . date( 'd' ) . '/' . $filename; $dowRes = new \generalDowmload( $url, $path . $strExt ); if( !empty( $dowRes ) && isset( $dowRes->basename ) ) { if( isset( $dowRes->location ) && strlen( $dowRes->location ) ) { $this->src_file = $dowRes->location; } else { $this->src_file = $this->basisUploadPath . $path . $strExt; } } else { return false; } if( !isset( $this->src_file ) || is_null( $this->src_file ) || !file_exists( $this->src_file ) ) { return false; } $arrImageInfos = @getimagesize( $this->src_file ); if( !isset( $arrImageInfos ) || empty( $arrImageInfos ) ) { return false; } if( isset( $arrImageInfos[0] ) && $arrImageInfos[0] ) { $this->src_width = $arrImageInfos[0]; } if( isset( $arrImageInfos[1] ) && $arrImageInfos[1] ) { $this->src_height = $arrImageInfos[1]; } $this->src_type = 2; if( isset( $arrImageInfos[2] ) && $arrImageInfos[2] ) { $this->src_type = $arrImageInfos[2]; } if( isset( $arrImageInfos[ 'mime' ] ) ) { $this->mime = $arrImageInfos[ 'mime' ]; } switch( $this->src_type ) { case IMAGETYPE_JPEG : ini_set( 'gd.jpeg_ignore_warning', true ); $this->sImage = @imagecreatefromjpeg( $this->src_file ); $this->ext = 'jpg'; if( !isset( $this->mime ) || strlen( $this->mime ) <= 0 ) { $this->mime = 'image/jpeg'; } break; case IMAGETYPE_PNG : $this->sImage = @imagecreatefrompng( $this->src_file ); $this->ext = 'png'; if( !isset( $this->mime ) || strlen( $this->mime ) <= 0 ) { $this->mime = 'image/' . $this->ext; } break; case IMAGETYPE_GIF : $this->sImage = imagecreatefromgif( $this->src_file ); $this->ext = 'gif'; if( !isset( $this->mime ) || strlen( $this->mime ) <= 0 ) { $this->mime = 'image/' . $this->ext;; } break; case 18: $this->sImage = @imagecreatefromwebp( $this->src_file ); $this->ext = 'webp'; if( !isset( $this->mime ) || strlen( $this->mime ) <= 0 ) { $this->mime = 'image/' . $this->ext;; } break; default: return false; } return true; } /** * 裁剪 * @author Administrator * @datetime 2020年7月22日 下午3:07:36 * @comment * * @param unknown $dst_width * @param unknown $dst_height * @param unknown $dst_x * @param unknown $dst_y * @param string $dst_file * @return boolean */ public function cutImage( $dst_width, $dst_height, $dst_x, $dst_y, $originWidth, $originHeight ) { if( !$dst_width || !$dst_height ) { return false; } # 创建画布时，判断最终需要的画布大小 if ($originWidth && $originHeight) { $dst_w = $originWidth; $dst_h = $originHeight; } else { $dst_w = $dst_width; $dst_h = $dst_height; } $this->dImage = imagecreatetruecolor( $dst_w, $dst_h ); //创建了目标文件的大小的画布 $bg = imagecolorallocatealpha( $this->dImage, 255, 255, 255, 127 ); //给画布分配颜色 imagefill( $this->dImage, 0, 0, $bg ); //给图像用颜色进行填充 imagecolortransparent( $this->dImage, $bg ); //背景定义成透明色 $ratio_w = 1.0 * $dst_width / $this->src_width; //横向缩放的比例 $ratio_h = 1.0 * $dst_height / $this->src_height; //纵向缩放的比例 //不进行缩放,直接对图像进行裁剪 $ratio = 1.0; $tmp_w = (int)($dst_width / $ratio); $tmp_h = (int)($dst_height / $ratio); $tmp_img = imagecreatetruecolor( $dst_width, $dst_height ); //创建暂时保存的画布 imagecopy( $tmp_img, $this->sImage, 0, 0, $dst_x,$dst_y, $dst_width, $dst_height ); //拷贝出图像的一部分,进行裁切 imagecopyresampled( $this->dImage, $tmp_img, 0, 0, 0, 0, $dst_w, $dst_h, $tmp_w, $tmp_h ); //把暂时缓存的图片,放到目标文件里面 imagedestroy( $tmp_img ); return true; } /** * 存储 * @author Administrator * @datetime 2020年7月22日 下午3:15:52 * @comment * * @param unknown $file * @return boolean */ public function save( $file = null ) { if( !isset( $file ) || is_null( $file ) ) { $this->dst_file = $this->src_file; } else { $this->dst_file = $this->basisUploadPath . '/'. $file; } try{ switch( $this->src_type ) { case IMAGETYPE_JPEG : @imagejpeg( $this->dImage, $this->dst_file, 98 ); break; case IMAGETYPE_PNG : imagepng( $this->dImage, $this->dst_file ); break; case IMAGETYPE_GIF : imagegif( $this->dImage, $this->dst_file ); break; case 18: @imagejpeg( $this->dImage, $this->dst_file, 98 ); break; default: return false; } }catch( \Exception $e ){ } $strExt = $this->getImgExt( $this->dst_file ); $tmpImageInfo = @getimagesize( $this->dst_file ); $width = 0; $height = 0; if( isset( $tmpImageInfo[0] ) && $tmpImageInfo[0] > 0 ) { $width = $tmpImageInfo[0]; } if( isset( $tmpImageInfo[1] ) && $tmpImageInfo[1] > 0 ) { $height = $tmpImageInfo[1]; } $objRet = new \stdClass(); $objRet->mime = $this->mime; $objRet->filename = basename( $this->dst_file ); $objRet->ext = $strExt; $objRet->width = $width; $objRet->height = $height; return $objRet; } /** * 数据销毁 * @author Administrator * @datetime 2020年7月22日 下午3:31:12 * @comment * */ public function destroy() { imagedestroy( $this->sImage); imagedestroy( $this->dImage ); @unlink( $this->src_file ); return true; } /** * 检索图集是否存在后缀 * 若不存在-则使用默认（强制转换） * @author Administrator * @datetime 2018年11月27日 下午3:30:47 * @comment * * @param unknown $url * @return string|unknown */ protected function getImgExt( $url ) { $iLastSlash = strrpos( $url, '/' ); $strFileName = mb_substr( $url, intval($iLastSlash+1) ); $strExt = strrchr( $strFileName, '.' ); preg_match( "/(.*?)\?.*?/", $strExt, $matches ); if( !empty( $matches ) && isset( $matches[1] ) ) { $strExt = $matches[1]; } if( false == $strExt || is_null( $strExt ) || strlen( $strExt ) <= 0 ) { $strExt = '.jpg'; } return $strExt; } }知识补充
除了上文的内容，小编还为大家整理了php实现封装图片水印添加、压缩、剪切的相关方法，希望对大家有所帮助
<?php class Image{ private $info; private $image; public $type; public function construct($src) { $this->info=getimagesize($src); $this->type=image_type_to_extension($this->info['2'],false); $fun="imagecreatefrom{$this->type}"; $this->image=$fun($src); } /** * 文字水印 * @param [type] $font 字体 * @param [type] $content 内容 * @param [type] $size 文字大小 * @param [type] $col 文字颜色（四元数组） * @param array $location 位置 * @param integer $angle 倾斜角度 * @return [type] */ public function fontMark($font,$content,$size,$col,$location,$angle=0){ $col=imagecolorallocatealpha($this->image, $col['0'], $col['1'], $col['2'],$col['3']); imagettftext($this->image, $size, $angle, $location['0'], $location['1'], $col,$font,$content); } /** * 图片水印 * @param [type] $imageMark 水印图片地址 * @param [type] $dst 水印图片在原图片中的位置 * @param [type] $pct 透明度 * @return [type] */ public function imageMark($imageMark,$dst,$pct){ $info2=getimagesize($imageMark); $type=image_type_to_extension($info2['2'],false); $func2="imagecreatefrom".$type; $water=$func2($imageMark); imagecopymerge($this->image, $water, $dst[0], $dst[1], 0, 0, $info2['0'], $info2['1'], $pct); imagedestroy($water); } /** * 压缩图片 * @param [type] $thumbSize 压缩图片大小 * @return [type] [description] */ public function thumb($thumbSize){ $imageThumb=imagecreatetruecolor($thumbSize[0], $thumbSize[1]); imagecopyresampled($imageThumb, $this->image, 0, 0, 0, 0, $thumbSize[0], $thumbSize[1], $this->info['0'], $this->info['1']); imagedestroy($this->image); $this->image=$imageThumb; } /** * 裁剪图片 * @param [type] $cutSize 裁剪大小 * @param [type] $location 裁剪位置 * @return [type] [description] */ public function cut($cutSize,$location){ $imageCut=imagecreatetruecolor($cutSize[0],$cutSize[1]); imagecopyresampled($imageCut, $this->image, 0, 0, $location[0], $location[1],$cutSize[0],$cutSize[1],$cutSize[0],$cutSize[1]); imagedestroy($this->image); $this->image=$imageCut; } /** * 展现图片 * @return [type] [description] */ public function show(){ header("content-type:".$this->info['mime']); $funn="image".$this->type; $funn($this->image); } /** * 保存图片 * @param [type] $newname 新图片名 * @return [type] [description] */ public function save($newname){ header("content-type:".$this->info['mime']); $funn="image".$this->type; $funn($this->image,$newname.'.'.$this->type); } public function destruct(){ imagedestroy($this->image); } }
