PHP picture Clipping and zooming example (lossless cropping picture)

This article describes the PHP picture clipping and scaling example, not much nonsense, the specific code is as follows:

/* *exif_imagetype--Determine the type of an image * Function Description: function is to cut an image into an image of any size, and keep the image is not deformed * parameter description: Enter the file name to process the picture, generate a new picture of the saved file name, create a new picture of the width of the new image to create a high * /////Get any size image, no stretching in place, no distortion, no blank function image_resize ($src _file, $dst _file, $new _width, $new _height) {$new _width =        Intval ($new _width);        $new _height = intval ($new _width);     if ($new _width < 1 | | $new _height < 1) {echo "params width or height error!";   Exit (); } if (!file_exists ($src _file)) {echo $src _file.     "is NOT exists!";   Exit ();        }//Image type $type = Exif_imagetype ($src _file);        $support _type = Array (imagetype_jpeg, imagetype_png, imagetype_gif); if (!in_array ($type, $support _type, True)) {echo "This type of the image does not support!     Only support JPG, GIF or PNG ";   Exit (); }//load Image switch ($type) {case Imagetype_jpeg: $src _img = Imagecreatefromjpeg ($SR                C_file);              Break               Case Imagetype_png: $src _img = imagecreatefrompng ($src _file);              Break                Case Imagetype_gif: $src _img = imagecreatefromgif ($src _file);              Break                Default:echo "Load image error!";   Exit ();        } $w = Imagesx ($src _img);        $h = Imagesy ($src _img);        $ratio _w = 1.0 * $new _width/$w;        $ratio _h = 1.0 * $new _height/$h;        $ratio = 1.0; The resulting image of the aspect ratio of the original is small, or large, the principle is to take a large proportion of magnification, the large proportion of the reduction (smaller proportion) if (($ratio _w < 1 && $ratio _h < 1) | |   ($ratio _w > 1 && $ratio _h > 1))                {if ($ratio _w < $ratio _h) {$ratio = $ratio _h;              Case one, the proportion of width is smaller than the height direction, cut or enlarge according to the height proportion standard} else {$ratio = $ratio _w;            }//define an intermediate temporary image, the aspect ratio of the image meets the target requirements $inter _w = (int) ($new _width/$ratio);            $inter _h = (int) ($new _height/$ratio); $inter _img = Imagecreatetruecolor ($inter _w, $inter _h);            Var_dump ($inter _img);            Imagecopy ($inter _img, $src _img, 0, 0, 0, 0, $inter _w, $inter _h);            Generate a temporary image with a maximum edge length of $ratio scale for the target image//define a new image $new _img = Imagecreatetruecolor ($new _width, $new _height);     Var_dump ($new _img); exit ();            Imagecopyresampled ($new _img, $inter _img, 0, 0, 0, 0, $new _width, $new _height, $inter _w, $inter _h);                    Switch ($type) {case IMAGETYPE_JPEG://Storage image imagejpeg ($new _img, $dst _file, 100);                  Break                    Case Imagetype_png:imagepng ($new _img, $dst _file, 100);                  Break                    Case Imagetype_gif:imagegif ($new _img, $dst _file, 100);                  Break     Default:break; }//End If 1//2 one edge of the target image is larger than the original, one edge is smaller than the original, then the flat image is enlarged, then cropped//=if (($ratio _w < 1 && $ratio _ H > 1) | | ($ratio _w >1 &&            $ratio _h <1)) Else {$ratio = $ratio _h > $ratio _w? $ratio _h: $ratio _w;            Take a large proportion of that value//define a large middle image, the image is equal to the height or width of the target image, and then enlarge the original $inter _w = (int) ($W * $ratio);            $inter _h = (int) ($H * $ratio);            $inter _img = Imagecreatetruecolor ($inter _w, $inter _h);            Scale the original image to crop imagecopyresampled ($inter _img, $src _img, 0, 0, 0, 0, $inter _w, $inter _h, $w, $h);            Define a new image $new _img = Imagecreatetruecolor ($new _width, $new _height);            Imagecopy ($new _img, $inter _img, 0, 0, 0, 0, $new _width, $new _height);                    Switch ($type) {case IMAGETYPE_JPEG://Storage image imagejpeg ($new _img, $dst _file, 100);                  Break         Case Imagetype_png:imagepng ($new _img, $dst _file, 100);                  Break                    Case Imagetype_gif:imagegif ($new _img, $dst _file, 100);       Break           Default:break; }}//if3}//End Function//output new picture image_resize (' test.jpg ', ' demo.jpg ', ' 1200px ', ' 1200px ');

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