PHP thumbnail code, imagecopyresampled function generates thumbnails

function CreateImage($SrcImageUrl, $DirImageUrl, $Width, $Height)

$srcw = imagesx($img);

if ($srcw / $srch > $Width / $Height)

$new_image = imagecreatetruecolor($new_width, $new_height);

imagedestroy($img);

*$o_photo Original image path

*$d_photo Processed image Path

*$width Define width

*$height Define height

*Call method cutphoto("test.jpg ","temp.jpg",256,146);

*/

function cutphoto($o_photo,$d_photo,$width,$height){< ;/p>

$temp_img = imagecreatefromjpeg($o_photo);

$o_width = imagesx($temp_img); //Get the original image width

//Judge the processing method

if($width>$o_width || $height>$o_height){//The width or height of the original image is smaller than the specified size, and is compressed

$newwidth=$o_width;

$newheight=$o_height;

if($o_width>$width){

$newwidth=$width;

}

if($newheight>$height){

$newheight=$height;

}

$new_img = imagecreatetruecolor($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{//The original image width and height are larger than the specified size, compress and then crop

if($o_height*$width /$o_width>$height){//First make sure the width is the same as the specification. If the height is larger than the specification, then ok

$newwidth=$width;

$newheight=$o_height*$width/$o_width;

$x=0;

$y=($newheight-$height)/2;

}else{ // Otherwise, make sure the height is the same as specified, and the width is adaptive

$newwidth=$o_width*$height/$o_height;

$newheight=$height;

$x=($newwidth-$width)/2;

$y=0 ;

}

//Thumbnail image

$new_img = imagecreatetruecolor($newwidth, $newheight);< ;/p>

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);

$o_height = imagesy($temp_img); //Get the thumbnail height

$new_imgx = imagecreatetruecolor($width,$height);

imagecopyresampled($new_imgx,$temp_img,0,0, $x,$y,$width,$height,$width,$height);

imagejpeg($new_imgx , $d_photo);

imagedestroy( $new_imgx);