PHP image processing method, PHP image processing class

Previously written by a PHP online processing upload images, can be cropped. Add watermark map, watermark map More than the target image size, the watermark can automatically adapt to the target image and reduce, the watermark can be set with the background of the merging degree. Source: http://www.pooy.net/phpphp.html *exif_imagetype--Judging the type of an image * Source code Download: http://www.pooy.net/phpphp.html * Description: Function function is to cut an image into an image of any size, the image is not deformed * Parameter Description: Enter the file name that needs to process the picture, generate a new picture of the saved file name, create a new image width, create a new picture of the high */ Get images of any size, stretch without distortion, leave no space function My_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, $support _type,true)) { echo "This type of image does not support! Only support JPG, GIF or PNG "; Exit (); } Load image Switch ($type) { Case IMAGETYPE_JPEG: $src _img=imagecreatefromjpeg ($src _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; $ratio = 1.0; The resulting image of the aspect ratio of the original is small, or all large, the principle is to take a large proportion of magnification, take a large proportion of the reduction (smaller proportion) if (($ratio _w < 1 && $ratio _h < 1) | | ($ratio _w > 1 && $ratio _h > 1)) { if ($ratio _w < $ratio _h) { $ratio = $ratio _h; Case one, the width of the ratio is smaller than the height direction, according to the height of the proportional standard to cut or enlarge }else { $ratio = $ratio _w; } Defines an intermediate temporary image that meets the target's aspect ratio exactly. $inter _w= (int) ($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); Generates a temporary image that is the size of the maximum edge length, which is the $ratio scale of the target image To 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: Imagejpeg ($new _img, $dst _file,100); Storing images Break Case Imagetype_png: Imagepng ($new _img, $dst _file,100); Break Case Imagetype_gif: Imagegif ($new _img, $dst _file,100); Break Default Break } }//End If 1 2 One edge of the target image is larger than the original, one edge is smaller than the original, the flat image is enlarged, then cropped =if (($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 Defines an intermediate large image that is equal in height or width of the target image, and then zooms in on the original image $inter _w= (int) ($W * $ratio); $inter _h= (int) ($H * $ratio); $inter _img=imagecreatetruecolor ($inter _w, $inter _h); Crop after scaling the original Imagecopyresampled ($inter _img, $src _img,0,0,0,0, $inter _w, $inter _h, $w, $h); To 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: Imagejpeg ($new _img, $dst _file,100); Storing images Break Case Imagetype_png: Imagepng ($new _img, $dst _file,100); Break Case Imagetype_gif: Imagegif ($new _img, $dst _file,100); Break Default Break } }//IF3 }//End Function My_image_resize (' test.gif ', ' 11111.gif ', ' 100px ', ' 100px '); SOURCE Download: http://www.pooy.net/phpphp.html ?> Copy Code

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