PHP项目开发中最常用的自定义函数整理

冷不防 2022-05-28 12:51 184阅读 0赞

<?php 
        //alert提示 
        function alert($msg){  
            echo "<script>alert('$msg');</script>"; 
        } 
        //把一些预定义的字符转换为 HTML 实体 
        function d_htmlspecialchars($string) {  
        if(is_array($string)) { 
            foreach($string as $key => $val) { 
                $string[$key] = d_htmlspecialchars($val); 
            } 
        } else { 
            $string = str_replace('&', '&', $string); 
            $string = str_replace('"', '"', $string); 
            $string = str_replace(''', ''', $string); 
            $string = str_replace('<', '<', $string); 
            $string = str_replace('>', '>', $string); 
            $string = preg_replace('/&(#\d;)/', '&\1', $string); 
        } 
            return $string; 
        } 
        //在预定义字符前加上反斜杠，包括 单引号、双引号、反斜杠、NULL，以保护数据库安全 
        function d_addslashes($string, $force = 0) {  
            if(!$GLOBALS['magic_quotes_gpc'] || $force) { 
            if(is_array($string)) { 
                foreach($string as $key => $val) $string[$key] = d_addslashes($val, $force); 
            } 
            else $string = addslashes($string); 
            } 
            return $string; 
        } 
        //生成随机字符串，包含大写、小写字母、数字 
        function randstr($length) {  
            $hash = ''; 
            $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz'; 
            $max = strlen($chars) - 1; 
            mt_srand((double)microtime() * 1000000); 
            for($i = 0; $i < $length; $i++) { 
                $hash .= $chars[mt_rand(0, $max)]; 
            } 
            return $hash; 
        } 
        //转换时间戳为常用的日期格式 
        function trans_time($timestamp){  
            if($timestamp < 1) echo '无效的Unix时间戳'; 
            else return date("Y-m-d H:i:s",$timestamp); 
            } 
        //获取IP 
        function get_ip() {  
            if ($_SERVER["HTTP_X_FORWARDED_FOR"]) 
                $ip = $_SERVER["HTTP_X_FORWARDED_FOR"]; 
                else if ($_SERVER["HTTP_CLIENT_IP"]) 
                $ip = $_SERVER["HTTP_CLIENT_IP"]; 
                else if ($_SERVER["REMOTE_ADDR"]) 
                $ip = $_SERVER["REMOTE_ADDR"]; 
                else if (getenv("HTTP_X_FORWARDED_FOR")) 
                $ip = getenv("HTTP_X_FORWARDED_FOR"); 
                else if (getenv("HTTP_CLIENT_IP")) 
                $ip = getenv("HTTP_CLIENT_IP"); 
                else if (getenv("REMOTE_ADDR")) 
                $ip = getenv("REMOTE_ADDR"); 
            else 
                $ip = "Unknown"; 
            return $ip; 
        } 
        //计算时间差：默认返回类型为“分钟” 
        //$old_time 只能是时间戳，$return_type 为 h 是小时，为 s 是秒 
        function timelag($old_time,$return_type='m'){  
            if($old_time < 1){ 
                echo '无效的Unix时间戳'; 
            }else{ 
                switch($return_type){ 
                case 'h': 
                $type = 3600; break; 
                case 'm': 
                $type = 60; break; 
                case 's': 
                $type = 1; break; 
                case '': 
                $type = 60; break; 
                } 
            $dif = round( (time()-$old_time)/$type ) ; 
            return $dif; 
            } 
        } 
        //获取当前页面的URL地址 
        function url_this(){  
            $url = "http://".$_SERVER ["HTTP_HOST"].$_SERVER["REQUEST_URI"]; 
            $return_url = "<a href='$url'>$url</a>"; 
            return $return_url; 
        } 
        //跳转函数 
        function url_redirect($url,$delay=''){  
            if($delay == ''){ 
                echo "<script>window.location.href='$url'</script>"; 
            }else{ 
                echo "<meta http-equiv='refresh' content='$delay;URL=$url' />"; 
            } 
        } 
    } 
    //end func 
    
    ?>