PHP Picture zoom function: Zoom picture according to width ratio

/* The program does not overwrite the picture's original image by limiting the width of the image to a simple function that scales the picture. Picture equal to zoom function parameter description: $IMGSRC The original image address can be a remote picture or a path on the server. $newimgname the name of the picture after shrinking $kuan Limit the width of the picture, if it is larger than the width of the image to narrow down the operation. Example: $IMGSRC = "http://www.xingzuo51.com/upload/20141116/20141116010041-0.jpg";//Can be a remote picture. $newimgname = "Upload/20141116/000.jpg"; Do not add "/" in front of local path $kuan = 600; Img_suofang ($IMGSRC, $newimgname, $kuan); Call Picture shrink function */ function Img_suofang ($IMGSRC, $newimgname, $kuan) { $info = getimagesize ($IMGSRC); Get picture information List ($w, $h) = $info; $BL = ($h/$w); Print_r ($info); Die (); $type = $info [2]; Die ($type); if ($w > $kuan) { $k = $kuan; $g = ($k * $bl); Switch ($info [2]) { Case 1: $im = Imagecreatefromgif ($IMGSRC); $n = Imagecreatetruecolor ($k, $g); Imagecopyresampled ($n, $im, 0,0,0,0, $k, $g, $w, $h); $type = ". gif"; Imagegif ($n, $newimgname. " $type "); Break Case 2: $im = Imagecreatefromjpeg ($IMGSRC); $n = Imagecreatetruecolor ($k, $g); Imagecopyresampled ($n, $im, 0,0,0,0, $k, $g, $w, $h); $type = ". jpg"; Imagejpeg ($n, $newimgname. $type); Break Case 3: $im = Imagecreatefrompng ($IMGSRC); $n = Imagecreatetruecolor ($k, $g); Imagecopyresampled ($n, $im, 0,0,0,0, $k, $g, $w, $h); $type = ". png"; Imagepng ($n, $newimgname. $type); Break Default Die ("No jpg Image"); Break } if ($im && $n) { echo "generated thumbnails successfully. "; }else{ echo "failed to generate thumbnails. "; } Imagedestroy ($im); Imagedestroy ($n); }else{ echo "Picture does not exceed the specified width and does not need to be scaled. "; } } Copy Code

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