PHP圖片添加文字水印和圖片水印

1、圖片添加文字水印

/**
 *添加文字水印
 * @param string $filename
 * @param string $text
 * @param string  $fontfile
 */
function waterText($filename,$text="imooc.com",$fontfile="MSYH.TTF"){
	$fileInfo = getimagesize ( $filename );//得到圖片信息
	$mime = $fileInfo ['mime'];
	//echo $mime;//image/jpeg,image/gif
	$createFun = str_replace ( "/", "createfrom", $mime );//imagecreatefromjpeg
	$outFun = str_replace ( "/", null, $mime );//imagejpeg
	$image = $createFun ( $filename );//imagecreatefromjpeg()
	$color = imagecolorallocatealpha ( $image, 255, 0, 0, 50 ); //文字顏色
	$fontfile = "fonts/{$fontfile}";//字體文件
	imagettftext ( $image, 14, 0, 0, 14, $color, $fontfile, $text );
	$outFun ( $image, $filename );//imagejpeg()
	imagedestroy ( $image );
}

2、圖片添加圖片水印

/**
 *添加圖片水印
 * @param string $dstFile  底圖
 * @param string $srcFile  水印圖片
 * @param int $pct  透明度
 */
function waterPic($dstFile,$srcFile="../images/logo.jpg",$pct=30){
	$srcFileInfo = getimagesize ( $srcFile );//得到圖片信息
	$src_w = $srcFileInfo [0];
	$src_h = $srcFileInfo [1];
	$dstFileInfo = getimagesize ( $dstFile );
	$srcMime = $srcFileInfo ['mime'];
	$dstMime = $dstFileInfo ['mime'];
	$createSrcFun = str_replace ( "/", "createfrom", $srcMime );//imagecreatefromjpeg
	$createDstFun = str_replace ( "/", "createfrom", $dstMime );//imagecreatefromjpeg
	$outDstFun = str_replace ( "/", null, $dstMime );//imagejpeg
	$dst_im = $createDstFun ( $dstFile );//imagecreatefromjpeg()創建畫布資源
	$src_im = $createSrcFun ( $srcFile );//imagecreatefromjpeg()創建畫布資源
	imagecopymerge ( $dst_im, $src_im, 0, 0, 0, 0, $src_w, $src_h, $pct );
	//header ( "content-type:" . $dstMime );
	$outDstFun ( $dst_im, $dstFile );//imagejpeg
	imagedestroy ( $src_im );
	imagedestroy ( $dst_im );
}