Supports file upload compatibility and good image thumbnails

The following provides three generated reduction codes, which have good compatibility. You can also customize the height and width.

Function imageresize ($ srcfile, $ tow, $ toh, $ tofile = "")
{
If ($ tofile = "") {$ tofile = $ srcfile ;}
$ Info = "";
$ Data = getimagesize ($ srcfile, $ info );
Switch ($ data [2])
{
Case 1:
If (! Function_exists ("imagecreatefromgif ")){
Echo "your gd library cannot use images in gif format. Please use jpeg or png format! <A href = 'webpage effect: go (-1); '> return </a> ";
Exit ();
}
$ Im = imagecreatefromgif ($ srcfile );
Break;
Case 2:
If (! Function_exists ("imagecreatefromjpeg ")){
Echo "your gd library cannot use images in jpeg format. Please use images in other formats! <A href = 'javascript: go (-1); '> return </a> ";
Exit ();
}
$ Im = imagecreatefromjpeg ($ srcfile );
Break;
Case 3:
$ Im = imagecreatefrompng ($ srcfile );
Break;
}
$ Srcw = imagesx ($ im );
$ Srch = imagesy ($ im );
$ Towh = $ tow/$ toh;
$ Srcwh = $ srcw/$ srch;
If ($ towh <= $ srcwh ){
$ Ftow = $ tow;
$ Ftoh = $ ftow * ($ srch/$ srcw );
}
Else {
$ Ftoh = $ toh;
$ Ftow = $ ftoh * ($ srcw/$ srch );
}
If ($ srcw> $ tow | $ srch> $ toh)
{
If (function_exists ("imagecreatetruecolor ")){
@ $ Ni = imagecreatetruecolor ($ ftow, $ ftoh );
If ($ ni) imagecopyresampled ($ ni, $ im, 0, 0, 0, $ ftow, $ ftoh, $ srcw, $ srch );
Else {
$ Ni = imagecreate ($ ftow, $ ftoh );
Imagecopyresized ($ ni, $ im, 0, 0, 0, $ ftow, $ ftoh, $ srcw, $ srch );
}
} Else {
$ Ni = imagecreate ($ ftow, $ ftoh );
Imagecopyresized ($ ni, $ im, 0, 0, 0, $ ftow, $ ftoh, $ srcw, $ srch );
}
If (function_exists ('imagejpeg ') imagejpeg ($ ni, $ tofile );
Else imagepng ($ ni, $ tofile );
Imagedestroy ($ ni );
}
Imagedestroy ($ im );
}

Instance Code 2

<? Php tutorial
/* Constructor-generate thumbnails + watermarks. parameter description:
$ Srcfile-image file name,
$ Dstfile-save another file name,
$ Markwords-watermark text,
$ Markimage-watermark image,
$ Dstw-image save width,
$ Dsomething-image storage height,
$ Rate-Image Storage Quality */
Makethumb ("a.jpg", "B .jpg", "50", "50 ");
Function makethumb ($ srcfile, $ dstfile, $ dstw, $ dsomething, $ rate = 100, $ markwords = null, $ markimage = null)
{
$ Data = getimagesize ($ srcfile );
Switch ($ data [2])
{
Case 1:
$ Im = @ imagecreatefromgif ($ srcfile );
Break;
Case 2:
$ Im = @ imagecreatefromjpeg ($ srcfile );
Break;
Case 3:
$ Im = @ imagecreatefrompng ($ srcfile );
Break;
}
If (! $ Im) return false;
$ Srcw = imagesx ($ im );
$ Srch = imagesy ($ im );
$ Dstx = 0;
$ Dsty = 0;
If ($ srcw * $ DTH> $ srch * $ dstw)
{
$ Fd…… = round ($ srch * $ dstw/$ srcw );
$ Dsty = floor ($ DTH-$ fdth)/2 );
$ Fdstw = $ dstw;
}
Else
{
$ Fdstw = round ($ srcw * $ dsomething/$ srch );
$ Dstx = floor ($ dstw-$ fdstw)/2 );
$ Fdth = $ DTH;
}
$ Ni = imagecreatetruecolor ($ dstw, $ dsomething );
$ Dstx = ($ dstx <0 )? 0: $ dstx;
$ Dsty = ($ dstx <0 )? 0: $ dsty;
$ Dstx = ($ dstx> ($ dstw/2 ))? Floor ($ dstw/2): $ dstx;
$ Dsty = ($ dsty> ($ dsomething/2 ))? Floor ($ dsomething/s): $ dsty;
$ White = imagecolorallocate ($ ni, 255,255,255 );
$ Black = imagecolorallocate ($ ni, 0, 0 );
Imagefilledrectangle ($ ni, $ dstw, $ DTH, $ white); // fill the background color
Imagecopyresized ($ ni, $ im, $ dstx, $ dsty, 0,0, $ fdstw, $ fdsomething, $ srcw, $ srch );
If ($ markwords! = Null)
{
$ Markwords = iconv ("gb2312", "UTF-8", $ markwords );
// Convert the text encoding
Imagettftext ($ ni, 20, 30, 450,560, $ black, "simhei. ttf", $ markwords); // write a text watermark
// The parameters are in sequence: Text Size | deflection degree | abscissa | ordinate | text color | text type | text content
}
Elseif ($ markimage! = Null)
{
$ Wimage_data = getimagesize ($ markimage );
Switch ($ wimage_data [2])
{
Case 1:
$ Wimage = @ imagecreatefromgif ($ markimage );
Break;
Case 2:
$ Wimage = @ imagecreatefromjpeg ($ markimage );
Break;
Case 3:
$ Wimage = @ imagecreatefrompng ($ markimage );
Break;
}
Imagecopy ($ ni, $ wimage, 500,560, 88,31); // write the image watermark. The default image size is 88*31.
Imagedestroy ($ wimage );
}
Imagejpeg ($ ni, $ dstfile, $ rate );
Imagejpeg ($ ni, $ srcfile, $ rate );
Imagedestroy ($ im );
Imagedestroy ($ ni );
}
?>

Supports Image Upload code

<? Php

$ Pic_name = date ("dmyhis ");

// Generate the Image Width
$ Pic_width = $ _ post ['width'];

// Generate the Image Height
$ Pic_height = $ _ post ['length'];

Function resizeimage ($ im, $ maxwidth, $ maxheight, $ name ){
// Obtain the current image size
$ Width = imagesx ($ im );
$ Height = imagesy ($ im );
// Generate the size of the thumbnail
If ($ width> $ maxwidth) | ($ height> $ maxheight )){
$ Widthratio = $ maxwidth/$ width;
$ Heightratio = $ maxheight/$ height;
If ($ widthratio <$ heightratio ){
$ Ratio = $ widthratio;
} Else {
$ Ratio = $ heightratio;
}
$ Newwidth = $ width * $ ratio;
$ Newheight = $ height * $ ratio;

If (function_exists ("imagecopyresampled ")){
$ Newim = imagecreatetruecolor ($ newwidth, $ newheight );
Imagecopyresampled ($ newim, $ im, 0, 0, 0, 0, $ newwidth, $ newheight, $ width, $ height );
} Else {
$ Newim = imagecreate ($ newwidth, $ newheight );
Imagecopyresized ($ newim, $ im, 0, 0, 0, 0, $ newwidth, $ newheight, $ width, $ height );
}
Imagejpeg ($ newim, $ name. ". jpg ");
Imagedestroy ($ newim );
} Else {
Imagejpeg ($ im, $ name. ". jpg ");
}
}

If ($ _ files ['image'] ['SIZE']) {
// Echo $ _ files ['image'] ['type'];
If ($ _ files ['image'] ['type'] = "image/pjpeg" | $ _ files ['image'] ['type'] =" image/jpg "| $ _ files ['image'] ['type'] =" image/jpeg ") {
$ Im = imagecreatefromjpeg ($ _ files ['image'] ['tmp _ name']);
} Elseif ($ _ files ['image'] ['type'] = "image/x-png "){
$ Im = imagecreatefrompng ($ _ files ['image'] ['tmp _ name']);
} Elseif ($ _ files ['image'] ['type'] = "image/gif "){
$ Im = imagecreatefromgif ($ _ files ['image'] ['tmp _ name']);
}
If ($ im ){
If(file_exists($pic_name.'.jpg ')){
Unlink($pic_name.'.jpg ');
}
Resizeimage ($ im, $ pic_width, $ pic_height, $ pic_name );
Imagedestroy ($ im );
}
}
?>

"> <Br>
<Form enctype = "multipart/form-data" method = "post" action = "small_picture.php">
<Br>
<Input type = "file" name = "image" size = "50" value = ""> <p>
Width of the generated thumbnail: <input type = "text" name = "width" size = "5"> <p>
Length of the generated thumbnail: <input type = "text" name = "length" size = "5"> <p>
<Input type = "submit" value = "Upload image">
</Form>