php unlink删除文件

unlink作用删除文件，unlink($path),下面来看看关于删除文件实现吧，好了费话不说多了先看看实例再说。

  public function removePic($pic){
        if(@unlink($this->path.$pic) && @unlink($this->path.str_replace($this->pre_thumb,$this->pre_pic,$pic))) {
            $this->pic_count--;
            return true;
        }else{
            $this->reportErr($this->aErr[6]);
            return "!F";        //删除失败
        }
    }

其实unlink很简单的，不过他不能删除不为空的目录哦，如果要删除带有文件的目录我们就要用递归一个个文件的删除再删除上当。

关于删除文件查询以下文件

php 删除文件与目录代码

php删除目录的函数

或直接搜索

php目录删除在google搜索

下面是一个给图片加水印的函数，我们会看到很多网站都会给图片加上水印是吧，下面我们就把这个函数给拿出来吧。

 

public function water($filename,$water,$pos=0,$pct=80){
                // 加载水印图片
                $info = $this->getImageInfo($water);
                if(!empty($info[0])){
                        $water_w = $info[0];
                        $water_h = $info[1];
                        $type = $info['type'];
                        $fun  = 'imagecreatefrom'.$type;
                        $waterimg = $fun($water);
                } else{
                        return false;
                }
                // 加载背景图片
                $info = $this->getImageInfo($this->img);
                if(!empty($info[0])){
                        $old_w = $info[0];
                        $old_h = $info[1];
                        $type  = $info['type'];
                        $fun   = 'imagecreatefrom'.$type;
                        $oldimg = $fun($this->img);
                } else{
                        return false;
                }
                // 剪切水印
                $water_w >$old_w && $water_w = $old_w;
                $water_h >$old_h && $water_h = $old_h;

                // 水印位置
                switch($pos){
                        case 0://随机
                    $posX = rand(0,($old_w - $water_w));
                    $posY = rand(0,($old_h - $water_h));
                    break;
                case 1://1为顶端居左
                    $posX = 0;
                    $posY = 0;
                    break;
                case 2://2为顶端居中
                    $posX = ($old_w - $water_w) / 2;
                    $posY = 0;
                    break;
                case 3://3为顶端居右
                    $posX = $old_w - $water_w;
                    $posY = 0;
                    break;
                case 4://4为中部居左
                    $posX = 0;
                    $posY = ($old_h - $water_h) / 2;
                    break;
                case 5://5为中部居中
                    $posX = ($old_w - $water_w) / 2;
                    $posY = ($old_h - $water_h) / 2;
                    break;
                case 6://6为中部居右
                    $posX = $old_w - $water_w;
                    $posY = ($old_h - $water_h) / 2;
                    break;
                case 7://7为底端居左
                    $posX = 0;
                    $posY = $old_h - $water_h;
                    break;
                case 8://8为底端居中
                    $posX = ($old_w - $water_w) / 2;
                    $posY = $old_h - $water_h;
                    break;
                case 9://9为底端居右
                    $posX = $old_w - $water_w;
                    $posY = $old_h - $water_h;
                    break;
                default: //随机
                    $posX = rand(0,($old_w - $water_w));
                    $posY = rand(0,($old_h - $water_h));
                    break;
                }
            // 设定图像的混色模式
                imagealphablending($oldimg, true);
                // 添加水印
                imagecopymerge($oldimg, $waterimg, $posX, $posY, 0, 0, $water_w,$water_h,$pct);
                $fun = 'image'.$type;
                !@$fun($oldimg, $filename,100) && die('保存失败!检查目录是否存在并且可写?');
                  imagedestroy($oldimg);
                  imagedestroy($waterimg);
                  return $filename;
        }

下面我们来看看关于php isdir 与 mkdir 简介与使用方法吧，以及他们的作用了，好了下面先讲一下is_dir作吧，下面我们来看看例子。

 

$path=c:;

echo is_dir($path)?'t':'f';

如果c：、在就是输出t反之就是f

mkdir 作用是用来创建目录下面再来看看简单的is_dir与mkdir实现吧。

  private function checkPath($path){
        if(is_dir($path)){
            return true;
        }elseif(@mkdir($path)){
            return true;
        }

        return false;
    }

本站原创转注明www.111cn.net/phper/php.html

这是一款模仿baidu,google抓取你网页时的样子哦，下面就是代码看看吧。

header("Content-Type:text/html;charset=gbk");
$message=$_POST['message'];
$contents = @file_get_contents("$message");
if($contents=="Forbidden"){
 $ch = curl_init();
 $timeout = 5;
 curl_setopt ($ch, CURLOPT_URL, "$message");
 curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt ($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
 curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
 $contents = curl_exec($ch);
 curl_close($ch);
}
preg_match_all("/<title(.*?)</title>/is",$contents,$title);
preg_match_all("/<meta(.*?)>/is",$contents,$meta);
preg_match_all("/<body(.*?)body>/is",$contents,$body);
echo 'title：'.strip_tags($title[0][0]).'<br><br>';
for($i=0;$i<count($meta[0]);$i++){
 if(preg_match("/keywords/i",$meta[0][$i])){
  preg_match_all("/content="(.*?)"/is",$meta[0][$i],$keywords);

 }
 if(preg_match("/description/i",$meta[0][$i])){
  preg_match_all("/content="(.*?)"/is",$meta[0][$i],$description);

 }
}
echo 'keywords：'.strip_tags($keywords[1][0]).'<br><br>';
echo 'description：'.strip_tags($description[1][0]).'<br><br>';
echo 'body：'.strip_tags($body[0][0]);
?>

百度收录查询代码

function baidu(){
 global $day,$message,$num,$page,$content;
 $url="http://www.baidu.com/s?q1=&q2=&q3=&q4=&rn=10&lm=$day&ct=0&tn=downreg&ft=&q5=&q6=$message";
 
 $contents=@file_get_contents($url);
 preg_match_all("/百度一下，找到相关网页(.*?)篇/is",$contents,$num);
 preg_match_all("/<table border="0" cellpadding="0" cellspacing="0">(.*?)</table>/is",$contents,$content);
 preg_match_all("/<div class="p">(.*?)</div>/is",$contents,$page);
}