How to use php common custom methods

1. Month display

/** 月份顯示
*   @param  int    $m       1-12
*   @param  int    $type    0:long 1:short(default) 2:chinese
*   @return String
*/
function format_month($m, $type=0){
    $month = array(
                array('', 'January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'),
                array('', 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'June', 'July', 'Aug', 'Sept', 'Oct', 'Nov', 'Dec'),
                array('', '一月', '二月', '三月', '四月', '五月', '六月', '七月', '八月', '九月', '十月', '十一月', '十二月')
            );
    return $month[$type][$m];
}

2. Filter strings and retain UTF8 alphanumeric Chinese and some symbols

/** 過濾字符串,保留UTF8字母數字中文及部份符號
*   @param  String  $ostr
*   @return String
*/
function filter_utf8_char($ostr){
    preg_match_all('/[\x{FF00}-\x{FFEF}|\x{0000}-\x{00ff}|\x{4e00}-\x{9fff}]+/u', $ostr, $matches);
    $str = join('', $matches[0]);
    if($str==''){   //含有特殊字符需要逐個處理
        $returnstr = '';
        $i = 0;
        $str_length = strlen($ostr);
        while ($i<=$str_length){
            $temp_str = substr($ostr, $i, 1);
            $ascnum = Ord($temp_str);
            if ($ascnum>=224){
                $returnstr = $returnstr.substr($ostr, $i, 3);
                $i = $i + 3;
            }elseif ($ascnum>=192){
                $returnstr = $returnstr.substr($ostr, $i, 2);
                $i = $i + 2;
            }elseif ($ascnum>=65 && $ascnum<=90){
                $returnstr = $returnstr.substr($ostr, $i, 1);
                $i = $i + 1;
            }elseif ($ascnum>=128 && $ascnum<=191){ // 特殊字符
                $i = $i + 1;
            }else{
                $returnstr = $returnstr.substr($ostr, $i, 1);
                $i = $i + 1;
            }
        }
        $str = $returnstr;
        preg_match_all(&#39;/[\x{FF00}-\x{FFEF}|\x{0000}-\x{00ff}|\x{4e00}-\x{9fff}]+/u&#39;, $str, $matches);
        $str = join(&#39;&#39;, $matches[0]);
    }
    return $str;
}

3. Binary stream generation file

/** 二进制流生成文件
*   $_POST 无法解释二进制流，需要用到 $GLOBALS['HTTP_RAW_POST_DATA'] 或 php://input
*   $GLOBALS['HTTP_RAW_POST_DATA'] 和 php://input 都不能用于 enctype=multipart/form-data
*   @param    String    $file   要生成的文件路径
*   @return   boolean
*/
function binary_to_file($file){
    $content = $GLOBALS['HTTP_RAW_POST_DATA'];  // 需要php.ini设置
    if(empty($content)){
        $content = file_get_contents('php://input');    // 不需要php.ini设置，内存压力小
    }
    $ret = file_put_contents($file, $content, true);
    return $ret;
}

4. Forced update of image cache

/** 強制更新圖片緩存
*   @param Array $files 要更新的圖片
*   @param int $version 版本
*/
function force_reload_file($files=array(), $version=0){
    $html = '';
    if(!isset($_COOKIE['force_reload_page_'.$version])){ // 判斷是否已更新過
        setcookie('force_reload_page_'.$version, true, time()+2592000);
        $html .= &#39;<script type="text/javascript">&#39;."\r\n";
        $html .= &#39;window.onload = function(){&#39;."\r\n";
        $html .= &#39;setTimeout(function(){window.location.reload(true); },1000);&#39;."\r\n";
        $html .= &#39;}&#39;."\r\n";
        $html .= &#39;</script>&#39;;
        echo $html;
        exit();
    }else{  // 讀取圖片一次,針對chrome優化
        if($files){
            $html .= &#39;<script type="text/javascript">&#39;."\r\n";
            $html .= "<!--\r\n";
            for($i=0,$max=count($files); $i<$max; $i++){
                $html .= &#39;var force_reload_file_&#39;.$i.&#39; =new Image()&#39;."\r\n";
                $html .= &#39;force_reload_file_&#39;.$i.&#39;.src="&#39;.$files[$i].&#39;"&#39;."\r\n";
            }
            $html .= "-->\r\n";
            $html .= &#39;</script>&#39;;
        }
    }
    return $html;
}

5. Convert files to base64 and convert files with base64

/** 文件转base64输出
* @param  String $file 文件路径
* @return String base64 string
*/
function fileToBase64($file){
    $base64_file = '';
    if(file_exists($file)){
        $mime_type = mime_content_type($file);
        $base64_data = base64_encode(file_get_contents($file));
        $base64_file = 'data:'.$mime_type.';base64,'.$base64_data;
    }
    return $base64_file;
}
/** base64转文件输出
* @param  String $base64_data base64数据
* @param  String $file        要保存的文件路径
* @return boolean
*/
function base64ToFile($base64_data, $file){
    if(!$base64_data || !$file){
        return false;
    }
    return file_put_contents($file, base64_decode($base64_data), true);
}

6. Convert hexadecimal color to decimal System color

/** 16进制颜色转10进制颜色,例#FF0000转rgb(255, 0, 0);
* @param  String $hexcolor
* @return Array
*/
function hex2rgb($hexcolor){
    $color = str_replace('#', '', $hexcolor);
    if (strlen($color) > 3) {
        $rgb = array(
            'r' => hexdec(substr($color, 0, 2)),
            'g' => hexdec(substr($color, 2, 2)),
            'b' => hexdec(substr($color, 4, 2))
        );
    } else {
        $r = substr($color, 0, 1) . substr($color, 0, 1);
        $g = substr($color, 1, 1) . substr($color, 1, 1);
        $b = substr($color, 2, 1) . substr($color, 2, 1);
        $rgb = array(
            'r' => hexdec($r),
            'g' => hexdec($g),
            'b' => hexdec($b)
        );
    }
    return $rgb;
}

7. Get the difference time between two time periods

/** 获取两时间段相差时间
* @param datetime $starttime
* @param datetime $endtime
* @return String
*/
function diff_time($starttime, $endtime){
    $diff = abs(strtotime($starttime) - strtotime($endtime));
    $days = (int)($diff/86400);
    $hours = (int)($diff/3600);
    if($days>0){
        $ret = $days.' 天';
    }elseif($hours>0){
        $ret = $hours.' 小时';
    }else{
        $ret = '不足1小时';
    }
    return $ret;
}

8. Delayed output content

/** 延时输出内容
* @param int $sec 秒数，可以是小数例如 0.3
*/
function cache_flush($sec=2){
    ob_flush();
    flush();
    usleep($sec*1000000);
}

9. Use XOR (xor) key to encrypt and decrypt files

/** 文件加密,使用key与原文异或(XOR)生成密文,解密则再执行一次异或即可
* @param String $source 要加密或解密的文件
* @param String $dest   加密或解密后的文件
* @param String $key    密钥
*/
function file_encrypt($source, $dest, $key){
	if(file_exists($source)){
		
		$content = '';          // 处理后的字符串
		$keylen = strlen($key); // 密钥长度
		$index = 0;
		$fp = fopen($source, 'rb');
		while(!feof($fp)){
			$tmp = fread($fp, 1);
			$content .= $tmp ^ substr($key,$index%$keylen,1);
			$index++;
		}
		fclose($fp);
		return file_put_contents($dest, $content, true);
	}else{
		return false;
	}
}

10. Get the owner, group user, and permissions of the file or folder

/** 获取文件或文件夹的拥有者,组用户,及权限
* @param  String $filename
* @return Array
*/
function file_attribute($filename){
    if(!file_exists($filename)){
        return false;
    }
    $owner = posix_getpwuid(fileowner($filename));
    $group = posix_getpwuid(filegroup($filename));
    $perms = substr(sprintf('%o',fileperms($filename)),-4);
    $ret = array(
        'owner' => $owner['name'],
        'group' => $group['name'],
        'perms' => $perms
    );
    return $ret;
}

11. Delete empty directories and empty subdirectories

/** 删除所有空目录
* @param String $path 目录路径
*/
function rm_empty_dir($path){
    if($handle = opendir($path)){
        while(($file=readdir($handle))!==false){     // 遍历文件夹
            if($file!='.' && $file!='..'){
                $curfile = $path.'/'.$file;          // 当前目录
                if(is_dir($curfile)){                // 目录
                    rm_empty_dir($curfile);          // 如果是目录则继续遍历
                    if(count(scandir($curfile))==2){ // 目录为空,=2是因为. 和 ..存在
                        rmdir($curfile);             // 删除空目录
                    }
                }
            }
        }
        closedir($handle);
    }
}

12. Unicode to Chinese

/* unicode 转 中文
* @param  String $str unicode 字符串
* @return String
*/
function unescape($str) {
    $str = rawurldecode($str);
    preg_match_all("/(?:%u.{4})|&#x.{4};|&#\d+;|.+/U",$str,$r);
    $ar = $r[0];
    foreach($ar as $k=>$v) {
        if(substr($v,0,2) == "%u"){
            $ar[$k] = iconv("UCS-2BE","UTF-8",pack("H4",substr($v,-4)));
        }elseif(substr($v,0,3) == "&#x"){
            $ar[$k] = iconv("UCS-2BE","UTF-8",pack("H4",substr($v,3,-1)));
        }elseif(substr($v,0,2) == "&#") {
            $ar[$k] = iconv("UCS-2BE","UTF-8",pack("n",substr($v,2,-1)));
        }
    }
    return join("",$ar);
}

This article introduces common customization methods using php. For more related content, please Follow php Chinese website.

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