直接可以拿来用的PHP惯用功能代码片段(6~10)

文章来源：jquery教程?-?http://www.jq-school.com/Show.aspx?id=324

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前面已经分享了PHP常用功能代码片段(1~5)，今天是第二篇，也就是第六到十这5个实现代码片段，希望可以帮到jquery学堂群里面的成员和广大对PHP开发的网友们提高开发效率，以下是第二篇文章。

6、PHP实现zip压缩解压通用函数

function ezip($zip, $hedef = ''){
    $dirname=preg_replace('/.zip/', '', $zip);
    $root = $_SERVER['DOCUMENT_ROOT'].'/zip/';
    // echo $root. $zip;
    $zip = zip_open($root . $zip);
    // var_dump($zip);
    @mkdir($root . $hedef . $dirname.'/'.$zip_dosya);
    while($zip_icerik = zip_read($zip)){

        $zip_dosya = zip_entry_name($zip_icerik);
        if(strpos($zip_dosya, '.')){
            $hedef_yol = $root . $hedef . $dirname.'/'.$zip_dosya;
            @touch($hedef_yol);
            // echo $hedef_yol;
            $yeni_dosya = @fopen($hedef_yol, 'w+');
            @fwrite($yeni_dosya, zip_entry_read($zip_icerik));
            @fclose($yeni_dosya); 
            // $yeni_dosya;

        }else{
            @mkdir($root . $hedef . $dirname.'/'.$zip_dosya);
            // echo $root . $hedef . 'x/'.$zip_dosya;
        };
    };
}
// ezip('yuol.zip','./tr/');

function zip($path) {
    $path=preg_replace('/\/$/', '', $path);
    preg_match('/\/([\d\D][^\/]*)$/', $path, $matches, PREG_OFFSET_CAPTURE);
    $filename=$matches[1][0].".zip";
    // var_dump($filename);
    // set_time_limit(0);
    $zip = new ZipArchive();
    $zip->open($filename,ZIPARCHIVE::OVERWRITE);//return ;
    // var_dump($path);
    if (is_file($path)) {
        $path=preg_replace('/\/\//', '/', $path);
        $base_dir=preg_replace('/\/[\d\D][^\/]*$/', '/', $path);
        $base_dir=addcslashes($base_dir, '/:');

        $localname=preg_replace('/'.$base_dir.'/', '', $path);
        // var_dump($localname);
        $zip->addFile($path,$localname);
        // var_dump($path);
        $zip->close();
        return;
    }elseif (is_dir($path)) {
        $path=preg_replace('/\/[\d\D][^\/]*$/', '', $path);
        $base_dir=$path.'/';//基目录
        $base_dir=addcslashes($base_dir, '/:');
        // var_dump($base_dir);
    }
    $path=preg_replace('/\/\//', '/', $path);
    // var_dump($path);
    function addItem($path,&$zip,&$base_dir){
        // var_dump($path);
        $handle = opendir($path);
        // var_dump($path);
        while (false !== ($file = readdir($handle))) {
            if (($file!='.')&&($file!='..')){
                // var_dump($file);
                $ipath=$path.'/'.$file;
                if (is_file($ipath)){//条目是文件
                    $localname=preg_replace('/'.$base_dir.'/', '', $ipath);
                    var_dump($localname);
                    $zip->addFile($ipath,$localname);
                    // var_dump($r);
                } else if (is_dir($ipath)){
                    addItem($ipath,$zip,$base_dir);
                    $localname=preg_replace('/'.$base_dir.'/', '', $ipath);
                    var_dump($localname);
                    $zip->addEmptyDir($localname);
                }
                // var_dump($path);
            }
        }
    }
    // var_dump($base_dir);
    addItem($path,$zip,$base_dir);
    $zip->close();
}
//调用方法
zip('解压的目录');

7、php实用获取远程图片的通用方法

function auto_save_image($body){
	$img_array = explode('&',$body);
	/*$img_array = array();
	preg_match_all("/(src)=[\"|\'| ]{0,}(http:\/\/(.*)\.(gif|jpg|jpeg|bmp|png))[\"|\'| ]{0,}/isU", $body, $img_array);
	$img_array = array_unique($img_array[2]);*/ //也可以自动匹配
	set_time_limit(0);
	$imgPath = "uploads/allimg/".date("Ymd")."/";
	$milliSecond = strftime("%H%M%S",time());
	if(!is_dir($imgPath)) @mkdir($imgPath,0777);
	foreach($img_array as $key =>$value)
	{
			$value = trim($value);
			$get_file = @file_get_contents($value);
			$rndFileName = $imgPath."/".$milliSecond.$key.".".substr($value,-3,3);
			if($get_file)
			{
					$fp = @fopen($rndFileName,"w");
					@fwrite($fp,$get_file);
					@fclose($fp);
			}
			$body = @ereg_replace($value, $rndFileName, $body);
	} 
	return $body;
}

8、PHP实现简单的文件下载通用方法

function download_file($file){
	if(is_file($file)){
		$length = filesize($file);
		$type = mime_content_type($file);
		$showname =  ltrim(strrchr($file,'/'),'/');
		header("Content-Description: File Transfer");
		header('Content-type: ' . $type);
		header('Content-Length:' . $length);
		if (preg_match('/MSIE/', $_SERVER['HTTP_USER_AGENT'])) { //for IE
		 header('Content-Disposition: attachment; filename="' . rawurlencode($showname) . '"');
		} else {
		 header('Content-Disposition: attachment; filename="' . $showname . '"');
		}
		readfile($file);
		exit;
	} else {
	 exit('文件已被删除！');
	}
}

9、PHP实现导出Excel文件通用方法

/**
    * 导出数据为excel表格
    *@param $data    一个二维数组,结构如同从数据库查出来的数组
    *@param $title   excel的第一行标题,一个数组,如果为空则没有标题
    *@param $filename 下载的文件名
    *@examlpe 
    $stu = M ('User');
    $arr = $stu -> select();
    exportexcel($arr,array('id','账户','密码','昵称'),'文件名!');
*/
function exportexcel($data=array(),$title=array(),$filename='report'){
    header("Content-type:application/octet-stream");
    header("Accept-Ranges:bytes");
    header("Content-type:application/vnd.ms-excel");  
    header("Content-Disposition:attachment;filename=".$filename.".xls");
    header("Pragma: no-cache");
    header("Expires: 0");
    //导出xls 开始
    if (!empty($title)){
        foreach ($title as $k => $v) {
            $title[$k]=iconv("UTF-8", "GB2312",$v);
        }
        $title= implode("\t", $title);
        echo "$title\n";
    }
    if (!empty($data)){
        foreach($data as $key=>$val){
            foreach ($val as $ck => $cv) {
                $data[$key][$ck]=iconv("UTF-8", "GB2312", $cv);
            }
            $data[$key]=implode("\t", $data[$key]);
            
        }
        echo implode("\n",$data);
    }
}

10、PHP实现如何清除TP的文件缓存

public function cache_clear() {
	$this->deldir(TEMP_PATH);
}
function deldir($dir) {
	$dh = opendir($dir);
	while ($file = readdir($dh)) {
		if ($file != "." && $file != "..") {
			$fullpath = $dir . "/" . $file;
			if (!is_dir($fullpath)) {
				unlink($fullpath);
			} else {
				deldir($fullpath);
			}
		}
	}
}

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