本文实例讲述了php生成图片缩略图功能。分享给大家供大家参考，具体如下：
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<?php
/*
* Created on 2011-3-18
*
* To change the template for this generated file go to
* Window - Preferences - PHPeclipse - PHP - Code Templates
*/
/*构造函数-生成缩略图+水印,参数说明:
$srcFile-图片文件名,
$dstFile-另存文件名,
$markwords-水印文字,
$markimage-水印图片,
$dstW-图片保存宽度,
$dstH-图片保存高度,
$rate-图片保存品质*/
makethumb("1.jpg", "aa/b.jpg", "50", "50");
function makethumb($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, $white); // 填充背景色
ImageCopyResized($ni, $im, $dstX, $dstY, 0, 0, $fdstW, $fdstH, $srcW, $srcH);
if ($markwords != null) {
$markwords = iconv("gb2312", "UTF-8", $markwords);
//转换文字编码
ImageTTFText($ni, 20, 30, 450, 560, $black, "simhei.ttf", $markwords); //写入文字水印
//参数依次为，文字大小|偏转度|横坐标|纵坐标|文字颜色|文字类型|文字内容
} elseif ($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, $wimage, 500, 560, 0, 0, 88, 31); //写入图片水印,水印图片大小默认为88*31
imagedestroy($wimage);
}
ImageJpeg($ni, $dstFile, $rate);
ImageJpeg($ni, $srcFile, $rate);
imagedestroy($im);
imagedestroy($ni);
}
?>
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希望本文所述对大家PHP程序设计有所帮助。