PHP for image cropping and generating thumbnail program source code

Program | source code | Thumbnail processing method is:
1. When the original image of the width or height of any smaller than the specified size, only to carry out, such as abbreviated processing,
2. When the original image of the width and height are larger than the specified size, the first to be compared to the abbreviated processing, and then calculate the center position for cutting

The following is the source code: <?php /* * $o _photo Original path * $d _photo image path after processing * $width definition width * $height High Definition * Call Method Cutphoto ("Test.jpg", "temp.jpg", 256,146); */ function Cutphoto ($o _photo, $d _photo, $width, $height) { $temp _img = imagecreatefromjpeg ($o _photo); $o _width = imagesx ($temp _img); Get the original image wide $o _height = Imagesy ($temp _img); Get high Judgment Processing method if ($width > $o _width | | $height > $o _height) {//Huantuquan or higher than the specified size, compress $newwidth = $o _width; $newheight = $o _height; if ($o _width> $width) { $newwidth = $width; $newheight = $o _height* $width/$o _width; } if ($newheight > $height) { $newwidth = $newwidth * $height/$newheight; $newheight = $height; } Thumbnail pictures $new _img = Imagecreatetruecolor ($newwidth, $newheight); Imagecopyresampled ($new _img, $temp _img, 0, 0, 0, 0, $newwidth, $newheight, $o _width, $o _height); Imagejpeg ($new _img, $d _photo); Imagedestroy ($new _img); }else{//Huantuquan and height are larger than the specified size, after compression cut if ($o _height* $width/$o _width> $height) {//Make sure the width is the same as the rule, if the height is larger than the specified, OK $newwidth = $width; $newheight = $o _height* $width/$o _width; $x = 0; $y = ($newheight-$height)/2; }else{//Otherwise determine the height is the same as the specified, Width adaptive $newwidth = $o _width* $height/$o _height; $newheight = $height; $x = ($newwidth-$width)/2; $y = 0; } Thumbnail pictures $new _img = Imagecreatetruecolor ($newwidth, $newheight); Imagecopyresampled ($new _img, $temp _img, 0, 0, 0, 0, $newwidth, $newheight, $o _width, $o _height); Imagejpeg ($new _img, $d _photo); Imagedestroy ($new _img); $temp _img = imagecreatefromjpeg ($d _photo); $o _width = imagesx ($temp _img); Get thumbnail width $o _height = Imagesy ($temp _img); Get thumbnail height Crop a picture $new _IMGX = Imagecreatetruecolor ($width, $height); Imagecopyresampled ($new _imgx, $temp _img,0,0, $x, $y, $width, $height, $width, $height); Imagejpeg ($new _imgx, $d _photo); Imagedestroy ($new _IMGX); } } ?>