PHP提取第一张图片+生成缩略图+图片添加水印

PHP获取网站文章的第一张图片

<?php
//调用文章首张图片，如果文章没有图片就调用默认图片no-image.jpg
$pattern="/<[img|IMG].*?src=[\'|\"](.*?(?:[\.gif|\.jpg|\.png]))[\'|\"].*?[\/]?>/";
$content = $article->Content; //文章内容
preg_match_all($pattern,$content,$matchContent);
if(isset($matchContent[1][0])){
$temp=$matchContent[1][0];
}else{
$temp="./images/no-image.jpg";//在相应位置放置一张命名为no-image的jpg图片
}
?>

PHP生成缩略图

function img_create_small($big_img, $width, $height, $small_img) {
//原始大图地址，缩略图宽度，高度，缩略图地址
$imgage = getimagesize($big_img); //得到原始大图片
$src_W = $imgage[0]; //获取大图片宽度
$src_H = $imgage[1]; //获取大图片高度
$tn = imagecreatetruecolor($width, $height); //创建缩略图
switch ($imgage[2]) { // 图像类型判断
case 1:
$im = imagecreatefromgif($big_img);
break;
case 2:
$im = imagecreatefromjpeg($big_img);
break;
case 3:
$im = imagecreatefrompng($big_img);
break;
}

imagecopyresampled($tn, $im, 0, 0, 0, 0, $width, $height, $src_W, $src_H); //复制图像并改变大小
imagejpeg($tn, $small_img); //输出图像
}

PHP为图片添加水印（函数部分+调用部分）

/////////////////函数部分/////////////////////////////
function imageWaterMark($groundImage,$waterPos=0,$waterImage=”",$waterText=”",$textFont=5,$textColor=”#FF0000″)
{
$isWaterImage = FALSE;
$formatMsg = “暂不支持该文件格式，请用图片处理软件将图片转换为GIF、JPG、PNG格式。”;

//读取水印文件
if(!emptyempty($waterImage) && file_exists($waterImage))
{
$isWaterImage = TRUE;
$water_info = getimagesize($waterImage);
$water_w   = $water_info[0];//取得水印图片的宽
$water_h   = $water_info[1];//取得水印图片的高

switch($water_info[2])//取得水印图片的格式
{
case 1:$water_im = imagecreatefromgif($waterImage);break;
case 2:$water_im = imagecreatefromjpeg($waterImage);break;
case 3:$water_im = imagecreatefrompng($waterImage);break;
default:die($formatMsg);
}
}

//读取背景图片
if(!emptyempty($groundImage) && file_exists($groundImage))
{
$ground_info = getimagesize($groundImage);
$ground_w   = $ground_info[0];//取得背景图片的宽
$ground_h   = $ground_info[1];//取得背景图片的高

switch($ground_info[2])//取得背景图片的格式
{
case 1:$ground_im = imagecreatefromgif($groundImage);break;
case 2:$ground_im = imagecreatefromjpeg($groundImage);break;
case 3:$ground_im = imagecreatefrompng($groundImage);break;
default:die($formatMsg);
}
}
else
{
die(”需要加水印的图片不存在！”);
}

//水印位置
if($isWaterImage)//图片水印
{
$w = $water_w;
$h = $water_h;
$label = “图片的”;
}
else//文字水印
{
$temp = imagettfbbox(ceil($textFont*5),0,”./cour.ttf”,$waterText);//取得使用 TrueType 字体的文本的范围
$w = $temp[2] - $temp[6];
$h = $temp[3] - $temp[7];
unset($temp);
$label = “文字区域”;
}
if( ($ground_w<$w) || ($ground_h<$h) )
{
echo “需要加水印的图片的长度或宽度比水印”.$label.”还小，无法生成水印！”;
return;
}
switch($waterPos)
{
case 0://随机
$posX = rand(0,($ground_w - $w));
$posY = rand(0,($ground_h - $h));
break;
case 1://1为顶端居左
$posX = 0;
$posY = 0;
break;
case 2://2为顶端居中
$posX = ($ground_w - $w) / 2;
$posY = 0;
break;
case 3://3为顶端居右
$posX = $ground_w - $w;
$posY = 0;
break;
case 4://4为中部居左
$posX = 0;
$posY = ($ground_h - $h) / 2;
break;
case 5://5为中部居中
$posX = ($ground_w - $w) / 2;
$posY = ($ground_h - $h) / 2;
break;
case 6://6为中部居右
$posX = $ground_w - $w;
$posY = ($ground_h - $h) / 2;
break;
case 7://7为底端居左
$posX = 0;
$posY = $ground_h - $h;
break;
case 8://8为底端居中
$posX = ($ground_w - $w) / 2;
$posY = $ground_h - $h;
break;
case 9://9为底端居右
$posX = $ground_w - $w;
$posY = $ground_h - $h;
break;
default://随机
$posX = rand(0,($ground_w - $w));
$posY = rand(0,($ground_h - $h));
break;
}

//设定图像的混色模式
imagealphablending($ground_im, true);

if($isWaterImage)//图片水印
{
imagecopy($ground_im, $water_im, $posX, $posY, 0, 0, $water_w,$water_h);//拷贝水印到目标文件
}
else//文字水印
{
if( !emptyempty($textColor) && (strlen($textColor)==7) )
{
$R = hexdec(substr($textColor,1,2));
$G = hexdec(substr($textColor,3,2));
$B = hexdec(substr($textColor,5));
}
else
{
die(”水印文字颜色格式不正确！”);
}
imagestring ( $ground_im, $textFont, $posX, $posY, $waterText, imagecolorallocate($ground_im, $R, $G, $B));
}

//生成水印后的图片
@unlink($groundImage);
switch($ground_info[2])//取得背景图片的格式
{
case 1:imagegif($ground_im,$groundImage);break;
case 2:imagejpeg($ground_im,$groundImage);break;
case 3:imagepng($ground_im,$groundImage);break;
default:die($errorMsg);
}

//释放内存
if(isset($water_info)) unset($water_info);
if(isset($water_im)) imagedestroy($water_im);
unset($ground_info);
imagedestroy($ground_im);
}

///////////////////////调用部分/////////////////
<?php
$id=$_REQUEST['id'];
$num = count($_FILES['userfile']['name']);
print_r($_FILES['userfile']);
print_r($_FILES['userfile']['name']);

echo $num;
echo "<br>";
if(isset($id)){
for($i=0;$i<$id;$i++){

if(isset($_FILES) && !emptyempty($_FILES['userfile']) && $_FILES['userfile']['size']>0){
$uploadfile = "./".time()."_".$_FILES['userfile'][name][$i];
echo "<br>";
echo $uploadfile;
if (copy($_FILES['userfile']['tmp_name'][$i], $uploadfile))
{
echo "OK<br>";

//文字水印
//imageWaterMark($uploadfile,5,”",”HTTP://www.lvye.info”,5,”#cccccc“);

//图片水印
$waterImage=”logo_ok1.gif”;//水印图片路径

imageWaterMark($uploadfile,9,$waterImage);

echo '<img src=\'".$uploadfile.'\' border=\”0\'>';
}
else
{
echo “Fail<br>';
}
}
}
}

?>
<!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" content="text/html; charset=utf-8" />
<title>调用部分</title>
</head>
<form enctype="multipart/form-data" method="get">
<?php for($a=0;$a<$id;$a++){  ?>
<input name="" type="file" name="userfile[]"/>
<?php } ?>
<input type=”submit” value=”上传”>
</form>
<body>
</body>
</html>

http://www.jb51.net/article/84729.htm

http://blog.csdn.net/grtreexyz/article/details/49930469

https://my.oschina.net/bojinzhu/blog/49318（imagecopyresampled参数详解）

http://www.jb51.net/article/14104.htm

http://wenda.so.com/q/1366478313065883（enctype=”multipart/form-data”）

http://www.php100.com/cover/php/397.html（unlink 和unset区别）