php将pdf生成png缩略图的实例程序

<?php
/** 
 * PDF2PNG
 * @param $pdf  待处理的PDF文件
 * @param $path 待保存的图片路径
 * @param $page 待导出的页面 -1为全部 0为第一页 1为第二页
 * @return      保存好的图片路径和文件名
 */
function pdf2png($pdf, $path, $page = 0) {
    if (!is_dir($path)) {
        mkdir($path, true);
    }
    if (!extension_loaded(&#39;imagick&#39;)) {
        echo &#39;没有找到imagick！&#39;;
        return false;
    }
    if (!file_exists($pdf)) {
        echo &#39;没有找到pdf&#39;;
        return false;
    } //www.phprm.com
    $im = new Imagick();
    $im->setResolution(120, 120); //设置图像分辨率
    $im->setCompressionQuality(80); //压缩比
    $im->readImage($pdf . "[" . $page . "]"); //设置读取pdf的第一页
    //$im->thumbnailImage(200, 100, true); // 改变图像的大小
    $im->scaleImage(200, 100, true); //缩放大小图像
    $filename = $path . "/" . time() . &#39;.png&#39;;
    if ($im->writeImage($filename) == true) {
        $Return = $filename;
    }
    return $Return;
}
$s = pdf2png(&#39;file/1371273225-ceshi_ppt.pdf&#39;, &#39;images&#39;);
echo &#39;<div align="center"><img src="&#39; . $s . &#39;"></div>&#39;;
?>

<?php
function pdf2png($PDF, $Path) {
    if (!extension_loaded(&#39;imagick&#39;)) {
        return false;
    }
    if (!file_exists($PDF)) {
        return false;
    }
    $IM = new imagick();
    $IM->setResolution(120, 120);
    $IM->setCompressionQuality(100);
    $IM->readImage($PDF);
    foreach ($IM as $Key => $Var) {
        $Var->setImageFormat(&#39;png&#39;);
        $Filename = $Path . &#39;/&#39; . md5($Key . time()) . &#39;.png&#39;;
        if ($Var->writeImage($Filename) == true) {
            $Return[] = $Filename;
        } //www.phprm.com
        
    }
    return $Return;
}
?>

<?php
header(&#39;Content-type: image/jpeg&#39;);
$image = new Imagick(&#39;image.jpg&#39;);
// If 0 is provided as a width or height parameter,// aspect ratio is maintained
$image->thumbnailImage(100, 0);
echo $image;
?>

<?php
/* Create a new imagick object and read in GIF */
$im = new Imagick("example.gif");
/* Resize all frames */
foreach ($im as $frame) {
    /* 50x50 frames */
    $frame->thumbnailImage(50, 50);
    /* Set the virtual canvas to correct size */
    $frame->setImagePage(50, 50, 0, 0);
} /* Notice writeImages instead of writeImage */
$im->writeImages("example_small.gif", true);
?>