Support file upload compatibility good picture thumbnail program _php tutorial

The following provides three code generation, compatibility is quite good, you can also customize the height and width oh.

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 GIF format pictures, please use JPEG or PNG format!" Return ";
Exit ();
}
$im = Imagecreatefromgif ($srcfile);
Break
Case 2:
if (!function_exists ("Imagecreatefromjpeg")) {
echo "Your GD library can not use JPEG format pictures, please use other format pictures!" Return ";
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, 0,0,0,0, $ftow, $ftoh, $SRCW, $srch);
else{
$ni =imagecreate ($ftow, $ftoh);
Imagecopyresized ($ni, $im, 0,0,0,0, $ftow, $ftoh, $SRCW, $srch);
}
}else{
$ni =imagecreate ($ftow, $ftoh);
Imagecopyresized ($ni, $im, 0,0,0,0, $ftow, $ftoh, $SRCW, $srch);
}
if (function_exists (' imagejpeg ')) imagejpeg ($ni, $tofile);
Else Imagepng ($ni, $tofile);
Imagedestroy ($ni);
}
Imagedestroy ($im);
}

Example code two

/* constructor-Generate thumbnail + watermark, parameter description:
$srcfile-picture file name,
$dstfile-Save file name,
$markwords-Watermark text,
$markimage-Watermark picture,
$DSTW-Picture Save width,
$dsth-Picture Save height,
$rate-Picture Preservation quality */
Makethumb ("A.jpg", "b.jpg", "50", "50");
function Makethumb ($srcfile, $dstfile, $DSTW, $dsth, $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 * $dsth > $srch * $dstw)
{
$fdsth = Round ($srch * $DSTW/$SRCW);
$dsty = Floor (($dsth-$fdsth)/2);
$FDSTW = $DSTW;
}
Else
{
$FDSTW = Round ($SRCW * $dsth/$srch);
$DSTX = Floor (($DSTW-$FDSTW)/2);
$fdsth = $dsth;
}
$ni =imagecreatetruecolor ($DSTW, $dsth);
$dstx = ($dstx <0)? 0: $dstx;
$dsty = ($dstx <0)? 0: $dsty;
$DSTX = ($dstx > ($DSTW/2)) Floor ($DSTW/2): $DSTX;
$dsty = ($dsty > ($dsth/2)) floor ($dsth/s): $dsty;
$white = Imagecolorallocate ($ni, 255,255,255);
$black = Imagecolorallocate ($ni, 0,0,0);
Imagefilledrectangle ($ni, 0,0, $DSTW, $dsth, $white);//Fill background color
Imagecopyresized ($ni, $im, $dstx, $dsty, 0,0, $FDSTW, $fdsth, $SRCW, $srch);
if ($markwords!=null)
{
$markwords =iconv ("gb2312", "Utf-8", $markwords);
Convert text Encoding
Imagettftext ($ni, 20,30,450,560, $black, "Simhei.ttf", $markwords); Write a text watermark
parameter is, text size | deflection | horizontal | ordinate | text color | text Type | text content
}
ElseIf ($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, $wimage, 500,560,0,0,88,31); Write image watermark, watermark image size defaults to 88*31
Imagedestroy ($wimage);
}
Imagejpeg ($ni, $dstfile, $rate);
Imagejpeg ($ni, $srcfile, $rate);
Imagedestroy ($im);
Imagedestroy ($ni);
}
?>

Support Image upload Code

$pic _name=date ("Dmyhis");

Create the width of the picture
$pic _width=$_post[' width ';

Height of the resulting picture
$pic _height=$_post[' length '];

Function Resizeimage ($im, $maxwidth, $maxheight, $name) {
//Get the current picture size
$width = Imagesx ($im);
$height = Imagesy ($im);
//Generate thumbnail size
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);
}
}
?>

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http://www.bkjia.com/PHPjc/632990.html www.bkjia.com true http://www.bkjia.com/PHPjc/632990.html techarticle The following provides three code generation, compatibility is quite good, you can also customize the height and width oh. function Imageresize ($srcfile, $tow, $toh, $tofile =) {if ($tofile = =) {$tofile = ...

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