PHP Image Compression Implementation code

/* Functions: resizing pictures or creating thumbnails return: True/false Parameters: $Image need to adjust the picture (with the path) $Dw =450 Maximum width when adjusting, absolute width when thumbnail $Dh Maximum height for =450 adjustment, absolute height at thumbnail $Type = 1 1, adjust the size; 2, generate thumbnail image Site http://bbs.it-home.org */ $path = ' img/';//path $phtypes =array ( ' Img/gif ', ' Img/jpg ', ' Img/jpeg ', ' Img/bmp ', ' Img/pjpeg ', ' Img/x-png ' ); Functionimg ($Image, $Dw =450, $Dh =450, $Type =1) { IF (! File_exists ($Image)) { Returnfalse; } #如果需要生成缩略图, copy the original image and assign it to $image again. IF ($Type!=1) { Copy ($Image, Str_replace (".", "_x.", $Image)); $Image =str_replace (".", "_x.", $Image); } #取得文件的类型, create different objects based on different types $ImgInfo =getimagesize ($Image); Switch ($ImgInfo [2]) { CASE1: $IMG = @ImageCreateFromGIF ($Image); break; CASE2: $IMG = @ImageCreateFromJPEG ($Image); break; CASE3: $IMG = @ImageCreateFromPNG ($Image); break; } #如果对象没有创建成功, the non-picture file is indicated IF (Empty ($IMG)) { #如果是生成缩略图的时候出错, you need to delete the files that have been copied IF ($Type!=1) {Unlink ($Image);} Returnfalse; } #如果是执行调整尺寸操作则 IF ($Type ==1) { $w =imagesx ($IMG); $h =imagesy ($IMG); $width = $w; $height = $h; IF ($width > $Dw) { $Par = $Dw/$width; $width = $Dw; $height = $height * $PAR; IF ($height > $Dh) { $Par = $Dh/$height; $height = $Dh; $width = $width * $PAR; } }elseif ($height > $Dh) { $Par = $Dh/$height; $height = $Dh; $width = $width * $PAR; IF ($width > $Dw) { $Par = $Dw/$width; $width = $Dw; $height = $height * $PAR; } }else{ $width = $width; $height = $height; } $NIMG =imagecreatetruecolor ($width, $height); #新建一个真彩色画布 Imagecopyresampled ($NIMG, $IMG, 0,0,0,0, $width, $height, $w, $h); #重采样拷贝部分图像并调整大小 Imagejpeg ($NIMG, $Image); #以JPEG格式将图像输出到浏览器或文件 Returntrue; #如果是执行生成缩略图操作则 }else{ $w =imagesx ($IMG); $h =imagesy ($IMG); $width = $w; $height = $h; $NIMG =imagecreatetruecolor ($Dw, $Dh); IF ($h/$w > $Dh/$Dw) {#高比较大 $width = $Dw; $height = $h * $Dw/$w; $IntNH = $height-$Dh; Imagecopyresampled ($NIMG, $IMG, 0,-$IntNH/1.8,0,0, $Dw, $height, $w, $h); }else{#宽比较大 $height = $Dh; $width = $w * $Dh/$h; $IntNW = $width-$Dw; Imagecopyresampled ($NIMG, $IMG,-$IntNW/1.8,0,0,0, $width, $Dh, $w, $h); } Imagejpeg ($NIMG, $Image); Returntrue; } } ?> Copy Code 2. Invoking the example /** Image compression Processing */ if ($_server[' Request_method ']== ' POST ') { if (!is_uploaded_file ($_files["photo"][tmp_name])) { echo "Picture does not exist"; Exit (); } if (!is_dir (' img ')) {//path is created if it does not exist) mkdir (' img '); } $upfile =$_files["Photo"]; $pinfo =pathinfo ($upfile ["name"]); $name = $pinfo [' basename '];//file name $tmp _name= $upfile ["Tmp_name"]; $file _type= $pinfo [' extension '];//get file type $showphpath = $path. $name; if (In_array ($upfile ["type"], $phtypes)) { echo "file type does not match! "; Exit (); } if (Move_uploaded_file ($tmp _name, $path. $name)) { echo "Success!" "; IMG ($showphpath, 100,800,2); } echo ""; } ?> Copy Code

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