到今天我学PHP已经快一年了。不过小弟资质相当有限，一直没有做出什么好东西来。在工作中有时需要把大批量的图片变小，这是一件很简单但很无聊的事情。有一天突发奇想，怎么不用PHP来做一个小程序呢？于是昨天完成了一个批量生成缩略图的小程序。现在发布出来，请各位大哥大姐多多批评！
1.先来分析一下程序的界面。
界面很简单：首先声明本程序仅支持JPG、GIF、PNG三种图片格式。然后分别指出源文件和缩略图保存的文件夹。接下来可以设置JPG的质量和缩量图的大小。最后是显示所消耗的时间和处理的图片数。
2.完整PHP源程序。源程序很简单，不多做解释。解压后直接放于可运行PHP的WWW目录下既可运行。
<?php
function microtimeFloat()
{
list($uSecond, $second) = explode(" ", microtime());
return ((float)$uSecond + (float)$second);
}
$dirFlag = pathinfo($_SERVER['scrīpt_FILENAME'],PATHINFO_DIRNAME);
$timeStart = microtimeFloat();
$sourcesDir = 'sources/';
$thumbsDir = 'thumbs/';
$jpgQuality = $_POST['jpgQuality'];
$thumbWidth = $_POST['thumbWidth'];
$counter = 0;
if($handle = opendir($sourcesDir)) {
while($imageName = readdir($handle)) {
$FileExtName = strtolower(pathinfo($imageName, PATHINFO_EXTENSION));
if(($FileExtName == 'gif') or ($FileExtName == 'jpg') or ($FileExtName == 'jpeg') or ($FileExtName == 'png')) {
$thumbsUrl = $thumbsDir.$imageName;
list($realWidth, $realHeight) = getimagesize($sourcesDir.$imageName);
if($realWidth < $thumbWidth){
$percent = 1;
} else {
$percent = $thumbWidth / $realWidth;
}
$newWidth = $realWidth * $percent;
$newHeight = $realHeight * $percent;
$currentThumb = imagecreatetruecolor($newWidth, $newHeight);
list($width, $height, $pictureType, $attrib) = getimagesize($sourcesDir.$imageName);
switch($pictureType)
{
case "1": $source = imagecreatefromgif($sourcesDir.$imageName); break;
case "2": $source = imagecreatefromjpeg($sourcesDir.$imageName); break;
case "3": $source = imagecreatefrompng($sourcesDir.$imageName); break;
}
imagecopyresized($currentThumb, $source, 0, 0, 0, 0, $newWidth, $newHeight, $realWidth, $realHeight);
switch($pictureType)
{
case "1": imagegif($currentThumb, $thumbsUrl); break;
case "2": imagejpeg($currentThumb, $thumbsUrl, $jpgQuality); break;
case "3": imagepng($currentThumb, $thumbsUrl); break;
}
$counter++;
}
}
closedir($handle);
$timeEnd = microtimeFloat();
$execTime = round($timeEnd - $timeStart, 2);
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" c />
<title>批量生成缩略图</title>
<scrīpt src="css/SpryValidationTextField.js" type="text/javascrīpt"></scrīpt>
<link href="css/autothumbs.css" rel="stylesheet" type="text/css" />
<link href="css/SpryValidationTextField.css" rel="stylesheet" type="text/css" />
</head>
<body>
<form id="autothumbs" name="autothumbs" method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<table width="760" border="0" align="center">
<tr>
<td> </td>
</tr>
<tr>
<td><div align="center" class="titel">批量生成缩略图</div></td>
</tr>
<tr>
<td>本程序仅支持JPG、GIF、PNG三种图片格式。</td>
</tr>
<tr>
<td>请将源文件放于：<strong><?php echo $dirFlag.'/sources/'; ?></strong></td>
</tr>
<tr>
<td>缩略图将保存于：<strong><?php echo $dirFlag.'/thumbs/'; ?></strong></td>
</tr>
<tr>
<td>JPG质量：<span id="spryjpgquality">
<input name="jpgQuality" type="text" id="jpgQuality" value="80" size="3" maxlength="3" />
<span class="textfieldRequiredMsg">请输入JPG质量</span><span class="textfieldInvalidFormatMsg">仅接受整数</span><span class="textfieldMaxValueMsg">请不要输入大于100的整数</span></span> </td>
</tr>
<tr>
<td>缩略图大小：<span id="sprythumbsize">
<input name="thumbWidth" type="text" id="thumbWidth" value="800" size="4" maxlength="4" />
<span class="textfieldRequiredMsg">请输入缩略图大小</span><span class="textfieldInvalidFormatMsg">仅接受整数</span></span>< /td>
</tr>
<tr>
<td><?php echo "耗时 $execTime 秒, 共处理 $counter 张图片"; ?></td>
</tr>
<tr>
<td> </td>
</tr>
<tr>
<td><div align="center">
<input name="thumbs" type="submit" class="button-css" id="thumbs" value="生 成" />
<input name="reset" type="reset" class="button-css" id="reset" value="重 置" />
</div></td>
</tr>
</table>
</form>
<scrīpt type="text/javascrīpt">
<!--
var sprytextfield1 = new Spry.Widget.ValidationTextField("spryjpgquality", "integer", {maxValue:100});
var sprytextfield2 = new Spry.Widget.ValidationTextField("sprythumbsize", "integer");
//-->
</scrīpt>
</body>
</html>