Php generates a thumbnail code to automatically fill in the blank space _ PHP Tutorial

The thumbnails generated by php can be automatically filled with spaces. Most of the thumbnails generated by the website are scaled in proportion. let's take a look at the fixed image size. if there is not enough, the system will automatically fill in the blank space. If you have any need, most of the thumbnails generated by the website are scaled. today, let's take a look at the fixed image size. "> the image size will automatically fill in the blank space if it is not enough. For more information, see.

Error_reporting (E_ALL );
// Test
Imagezoom('1.jpg ', '2.jpg', 400,300, '# ffff ');
/*
Php thumbnail function:
Proportional lossless compression, can be filled with complementary colors author: Huatai
Host format:
Bmp, jpg, gif, and png
Param:
@ Srcimage: the image to be reduced
@ Dstimage: the image to be saved
@ Dst_width: narrowing down the width
@ Dst_height: zoom in and out
@ Backgroundcolor: complementary colors such as: # FFFFFF supports 6 bits and does not support 3 bits
*/
Function imagezoom ($ srcimage, $ dstimage, $ dst_width, $ dst_height, $ backgroundcolor ){
// The file name is garbled
If (PHP_ OS = 'winnt '){
$ Srcimage = iconv ('utf-8', 'gbk', $ srcimage );
$ Dstimage = iconv ('utf-8', 'gbk', $ dstimage );
}
$ Dstimg = imagecreatetruecolor ($ dst_width, $ dst_height );
$ Color = imagecolorallocate ($ dstimg
, Hexdec (substr ($ backgroundcolor, 1, 2 ))
, Hexdec (substr ($ backgroundcolor, 3, 2 ))
, Hexdec (substr ($ backgroundcolor, 5, 2 ))
);
Imagefill ($ dstimg, 0, 0, $ color );
If (! $ Arr = getimagesize ($ srcimage )){
Echo "the file to generate the thumbnail does not exist ";
Exit;
}
$ Src_width = $ arr [0];
$ Src_height = $ arr [1];
$ Srcimg = null;
$ Method = getcreatemethod ($ srcimage );
If ($ method ){
Eval ('$ srcimg ='. $ method .';');
}
$ Dst_x = 0;
$ Dst_y = 0;
$ Dst_w = $ dst_width;
$ Dst_h = $ dst_height;
If ($ dst_width/$ dst_height-$ src_width/$ src_height)> 0 ){
$ Dst_w = $ src_width * ($ dst_height/$ src_height );
$ Dst_x = ($ dst_width-$ dst_w)/2;
} Elseif ($ dst_width/$ dst_height-$ src_width/$ src_height) <0 ){
$ Dst_h = $ src_height * ($ dst_width/$ src_width );
$ Dst_y = ($ dst_height-$ dst_h)/2;
}
Imagecopyresampled ($ dstimg, $ srcimg, $ dst_x
, $ Dst_y, 0, 0, $ dst_w, $ dst_h, $ src_width, $ src_height );
// Save the format
$ Arr = array (
'Jpg '=> 'imagejpeg'
, 'Jpeg '=> 'imagejpeg'
, 'PNG '=> 'imagepng'
, 'GIF' => 'imagegif'
, 'Bmp '=> 'imagebmp'
);
$ Suffix = strtolower (array_pop (explode ('.', $ dstimage )));
If (! In_array ($ suffix, array_keys ($ arr ))){
Echo "an error occurred while saving the file name ";
Exit;
} Else {
Eval ($ arr [$ suffix]. '($ dstimg, "'. $ dstimage .'");');
}
Imagejpeg ($ dstimg, $ dstimage );
Imagedestroy ($ dstimg );
Imagedestroy ($ srcimg );
}
Function getcreatemethod ($ file ){
$ Arr = array (
'000000' => "imagecreatefromgif ('$ file ')"
, 'Ffd8ff' => "imagecreatefromjpeg ('$ file ')"
, 'Mongod' => "imagecreatefrombmp ('$ file ')"
, '89504e '=> "imagecreatefrompng (' $ file ')"
);
$ Fd = fopen ($ file, "rb ");
$ Data = fread ($ fd, 3 );
$ Data = str2hex ($ data );
If (array_key_exists ($ data, $ arr )){
Return $ arr [$ data];
} Elseif (array_key_exists (substr ($ data, 0, 4), $ arr )){
Return $ arr [substr ($ data, 0, 4)];
} Else {
Return false;
}
}
Function str2hex ($ str ){
$ Ret = "";
For ($ I = 0; $ I <strlen ($ str); $ I ++ ){
$ Ret. = ord ($ str [$ I])> = 16? Strval (dechex (ord ($ str [$ I])
: '0'. strval (dechex (ord ($ str [$ I]);
}
Return strtoupper ($ ret );
}
// The BMP creation function does not exist in php.
Function imagecreatefrombmp ($ filename)
{
If (! $ F1 = fopen ($ filename, "rb") return FALSE;
$ FILE = unpack ("vfile_type/Vfile_size/Vreserved/Vbitmap_offset", fread ($ f1, 14 ));
If ($ FILE ['File _ type']! = 19778) return FALSE;
$ BMP = unpack ('vheader _ size/Vwidth/Vheight/vplanes/vbits_per_pixel '.
'/Vcompression/Vsize_bitmap/Vhoriz_resolution '.
'/Vvert_resolution/Vcolors_used/Vcolors_important', fread ($ f1, 40 ));
$ BMP ['Colors '] = pow (2, $ BMP ['bits _ per_pixel']);
If ($ BMP ['size _ bitmap'] = 0) $ BMP ['size _ bitmap'] = $ FILE ['File _ size']-$ file ['bitmap _ offset'];
$ BMP ['bytes _ per_pixel '] = $ BMP ['bits _ per_pixel']/8;
$ BMP ['bytes _ per_pixel2 '] = ceil ($ BMP ['bytes _ per_pixel']);
$ BMP ['desc'] = ($ BMP ['width'] * $ BMP ['bytes _ per_pixel ']/4 );
$ BMP ['desc']-= floor ($ BMP ['width'] * $ BMP ['bytes _ per_pixel ']/4 );
$ BMP ['demo'] = 4-(4 * $ BMP ['demo']);
If ($ BMP ['demo'] = 4) $ BMP ['demo'] = 0;
$ PALETTE = array ();
If ($ BMP ['Colors '] <16777216)
{
$ PALETTE = unpack ('v'. $ BMP ['Colors '], fread ($ f1, $ BMP ['Colors'] * 4 ));
}
$ IMG = fread ($ f1, $ BMP ['size _ bitmap']);
$ VIDE = chr (0 );
$ Res = imagecreatetruecolor ($ BMP ['width'], $ BMP ['height']);
$ P = 0;
$ Y = $ BMP ['height']-1;
While ($ Y> = 0)
{
$ X = 0;
While ($ X <$ BMP ['width'])
{
If ($ BMP ['bits _ per_pixel '] = 24)
$ COLOR = unpack ("V", substr ($ IMG, $ P, 3). $ VIDE );
Elseif ($ BMP ['bits _ per_pixel '] = 16)
{
$ COLOR = unpack ("n", substr ($ IMG, $ P, 2 ));
$ COLOR [1] = $ PALETTE [$ COLOR [1] + 1];
}
Elseif ($ BMP ['bits _ per_pixel '] = 8)
{
$ COLOR = unpack ("n", $ VIDE. substr ($ IMG, $ P, 1 ));
$ COLOR [1] = $ PALETTE [$ COLOR [1] + 1];
}
Elseif ($ BMP ['bits _ per_pixel '] = 4)
{
$ COLOR = unpack ("n", $ VIDE. substr ($ IMG, floor ($ P), 1 ));
If ($ P * 2) % 2 = 0) $ COLOR [1] = ($ COLOR [1]> 4 ); else $ COLOR [1] = ($ COLOR [1] & 0x0F );
$ COLOR [1] = $ PALETTE [$ COLOR [1] + 1];
}
Elseif ($ BMP ['bits _ per_pixel '] = 1)
{
$ COLOR = unpack ("n", $ VIDE. substr ($ IMG, floor ($ P), 1 ));
If ($ P * 8) % 8 = 0) $ COLOR [1] = $ COLOR [1]> 7;
Elseif ($ P * 8) % 8 = 1) $ COLOR [1] = ($ COLOR [1] & 0x40)> 6;
Elseif ($ P * 8) % 8 = 2) $ COLOR [1] = ($ COLOR [1] & 0x20)> 5;
Elseif ($ P * 8) % 8 = 3) $ COLOR [1] = ($ COLOR [1] & 0x10)> 4;
Elseif ($ P * 8) % 8 = 4) $ COLOR [1] = ($ COLOR [1] & 0x8)> 3;
Elseif ($ P * 8) % 8 = 5) $ COLOR [1] = ($ COLOR [1] & 0x4)> 2;
Elseif ($ P * 8) % 8 = 6) $ COLOR [1] = ($ COLOR [1] & 0x2)> 1;
Elseif ($ P * 8) % 8 = 7) $ COLOR [1] = ($ COLOR [1] & 0x1 );
$ COLOR [1] = $ PALETTE [$ COLOR [1] + 1];
}
Else
Return FALSE;
Imagesetpixel ($ res, $ X, $ Y, $ COLOR [1]);
$ X ++;
$ P + = $ BMP ['bytes _ per_pixel '];
}
$ Y --;
$ P + = $ BMP ['demo'];
}
Fclose ($ f1 );
Return $ res;
}
// BMP save function, which is not available in php
Function imagebmp ($ im, $ fn = false)
{
If (! $ Im) return false;
If ($ fn = false) $ fn = 'php: // output ';
$ F = fopen ($ fn, "w ");
If (! $ F) return false;
$ BiWidth = imagesx ($ im );
$ BiHeight = imagesy ($ im );
$ BiBPLine = $ biWidth * 3;
$ BiStride = ($ biBPLine + 3 )&~ 3;
$ BiSizeImage = $ biStride * $ biHeight;
$ BfOffBits = 54;
$ BfSize = $ bfOffBits + $ biSizeImage;
Fwrite ($ f, 'bm ', 2 );
Fwrite ($ f, pack ('vvvv ', $ bfSize, 0, 0, $ bfOffBits ));
Fwrite ($ f, pack ('vvvvvvvvvvv ', 40, $ biWidth, $ biHeight, 1, 24, 0, $ biSizeImage, 0, 0, 0, 0 ));
$ Numpad = $ biStride-$ biBPLine;
For ($ y = $ biHeight-1; $ y> = 0; -- $ y)
{
For ($ x = 0; $ x <$ biWidth; ++ $ x)
{
$ Col = imagecolorat ($ im, $ x, $ y );
Fwrite ($ f, pack ('v', $ col), 3 );
}
For ($ I = 0; $ I <$ numpad; ++ $ I)
Fwrite ($ f, pack ('C', 0 ));
}
Fclose ($ f );
Return true;
}
?>

Fill "> the image size. if it is not enough, it is automatically filled with blank space. A friend in need can...