17-文件上傳+生成縮略圖(版本II)
上一篇博文中,咱們曾經提到其侷限性,今天咱們就來把其修改一下吧!
第一:根據不一樣的文件類型來生成縮略圖
咱們曾經講過,咱們應該根據不一樣的文件類型來生成與之相對應格式的縮略圖,那麼就也就是說,咱們必須知道源文件的文件類型才能夠!那麼getp_w_picpathsize函數能夠完成這個功能!那麼這麼函數在使用時也就變成了:
$filename = "01.jpg";
$scalePercent
= 0.5;
list
(
$srcWidth
,
$srcHeight
,
$fileType
)
= getp_w_picpathsize($filename);
另外還有兩個問題,
一是:將讀取源文件資源時應該使用p_w_picpathcreategif、p_w_picpathcreatejpeg、p_w_picpathpng肯定了
二是:輸出圖像時使用p_w_picpathgif、p_w_picpathjpeg、p_w_picpathpng也肯定了
好了,能夠幹活吧!
<?php
$filename
= "01.jpg";
$scalePercent
= 0.5;
list
(
$srcWidth
,
$srcHeight
,
$fileType
)
= getp_w_picpathsize($filename);
$destWidth
= ceil($srcWidth * $scalePercent);
$destHeight
= ceil($srcHeight * $scalePercent);
$destImage
= p_w_picpathcreatetruecolor($destWidth,$destHeight);
if
(
$fileType
== 1)
{
$createImage = "p_w_picpathcreatefromgif";
$outImage = "p_w_picpathgif";
}
elseif
($fileType == 2)
{
$createImage = "p_w_picpathcreatefromjpeg";
$outImage = "p_w_picpathjpeg";
}
elseif
($fileType == 3)
{
$createImage = "p_w_picpathcreatefrompng";
$outImage = "p_w_picpathpng";
}
$srcImage
= $createImage($fil
ename);
p_w_picpathcopyresampled(
$destImage
,
$srcImage
,
0
,
0
,
0
,
0
,
$destWidth
,
$destHeight
,
$srcWidth
,
$srcHeight
);
$outImage
(
$destImage
,
"./small_
{
$filename
}
"
);
p_w_picpathdestroy(
$destImage
);
p_w_picpathdestroy(
$srcImage
);
具體的代碼在附件一
第二:根據文件上傳的文件生成縮略圖
在咱們實現的不一樣類型的圖像文件生成縮略圖後,咱們再來把整個過程升級!---將上傳文件生成縮略圖!
咱們先來實現一個簡單的!
首先,咱們來製做一個簡單的GUI,以下圖
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>Untitled Document</title>
<link href="style/common.css" rel="stylesheet" type="text/css" media="all" />
</head>
<body>
<div id="container">
<form action="uploadFile.php" method="post" enctype="multipart/form-data" name="form1" id="form1">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="120">選擇要上傳的文件:</td>
<td><input name="uploadFile" type="file" id="uploadFile" /></td>
</tr>
<tr>
<td> </td>
<td><input name="submit" type="submit" id="submit" value="上傳圖片" /></td>
</tr>
</table>
</form>
</div>
</body>
</html>
uploadFile.php
<?php
$filename
= $_FILES["uploadFile"]["name"];
$tmpName
= $_FILES["uploadFile"]["tmp_name"];
$errorCode
= $_FILES["uploadFile"]["error"];
if
(
$errorCode
== 0)
{
$scalePercent = 0.5;
list($srcWidth,$srcHeight,$fileType) = getp_w_picpathsize($tmpName);
$destWidth = ceil($srcWidth * $scalePercent);
$destHeight = ceil($srcHeight * $scalePercent);
$destImage = p_w_picpathcreatetruecolor($destWidth,$destHeight);
if($fileType == 1)
{
$createImage = "p_w_picpathcreatefromgif";
$outImage = "p_w_picpathgif";
}
elseif ($fileType == 2)
{
$createImage = "p_w_picpathcreatefromjpeg";
$outImage = "p_w_picpathjpeg";
}
elseif ($fileType == 3)
{
$createImage = "p_w_picpathcreatefrompng";
$outImage = "p_w_picpathpng";
}
$srcImage = $createImage($tmpName);
p_w_picpathcopyresampled($destImage,$srcImage,0,0,0,0,$destWidth,$destHeight,$srcWidth,$srcHeight);
$outImage($destImage,"./small_{$filename}");
p_w_picpathdestroy($destImage);
p_w_picpathdestroy($srcImage);
}
else
{
echo("
文件上傳失敗!
"
);
}
?>
固然,我沒有判斷文件的類型,請你們參照之前的博文就能夠了!
明天,咱們再將今天的功能進行升級-----添加水印效果!
晚安,各位!!!!