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 代码如下 $name =  iconv("gb2312","utf-8",www.111cn.net 一聚教程网);
$font = "simhei.ttf";//水印字体  
$im = imagecreatefromjpeg("test.jpg");//载入图片  
$black = imagecolorallocate($im, 0, 0, 0);//设置颜色  
imagettftext($im, 12, 0, 320, 84, $black, $font, $name);//打印水印  
imagepng($im);//输出图片,如果要保存加个保存路径和文件名,如imagepng($im,"test1.jpg");  
imagedestroy($im);//清空缓存 

下面来看一款生成水印文字函数

 代码如下

function str2pic ($string,$source,$destination="",$f,$fontsize=10,$shadowcolor="#ffffff",$f,$x=10,$y=10) {  
 //header("content-type:image/png");
    $pi=pathinfo($source);
    $pie=$pi[extension];#获取扩展名
    if(eregi("jpg|jpeg",$pie))$im=@imagecreatefromjpeg($source);
    if(eregi("gif",$pie))$im=@imagecreatefromgif($source);
    if(eregi("png",$pie))$im=@imagecreatefrompng($source);
    $col1=hex2dec($shadowcolor);#阴影颜色
    $col2=hex2dec($fontcolor);#字体颜色
    $col1=imagecolorallocate($im,$col1[0],$col1[1],$col1[2]);
    $col2=imagecolorallocate($im,$col2[0],$col2[1],$col2[2]);
    imagettftext($im,$fontsize,0,$y+1,$x+1,$col1,$fonturl,$string);
    imagettftext($im,$fontsize,0,$y,$x,$col2,$fonturl,$string);
    imagejpeg($im);
    if($destination)imagejpeg($im,$destination);
    imagedestroy($im);
}

function hex2dec($hexcolror) {#十六进制颜色转换成10进制颜色
    preg_match_all("/([0-f]){2,2}/i",$hexcolror,$matches);
    if(count($matches[0])==3){
    $rr=hexdec($matches[0][0]);
    $gg=hexdec($matches[0][1]);
    $bb=hexdec($matches[0][2]);
    }
    return array($rr,$gg,$bb);
}
?>
str2pic("[url=http://www.111cn.net]www.111cn.net","winter.jpg","winter2.jpg","simhei.ttf",10,"ffffff","330099",10,10[/url]);
?>

 

本文来源：http://www.gdgbn.com/kuzhan/26644/