function fn_safe($str_string) {
    //直接剔除
    $_arr_dangerChars = array(
        "|", ";", "$", "@", "+", "\t", "\r", "\n", ",", "(", ")", PHP_EOL //特殊字符
    );
 
    //正則剔除
    $_arr_dangerRegs = array(
        /* -------- 跨站 --------*/
 
        //html 標(biāo)簽
        "/<(script|frame|iframe|bgsound|link|object|applet|embed|blink|style|layer|ilayer|base|meta)\s+\S*>/i",
 
        //html 屬性
        "/on(afterprint|beforeprint|beforeunload|error|haschange|load|message|offline|online|pagehide|pageshow|popstate|redo|resize|storage|undo|unload|blur|change|contextmenu|focus|formchange|forminput|input|invalid|reset|select|submit|keydown|keypress|keyup|click|dblclick|drag|dragend|dragenter|dragleave|dragover|dragstart|drop|mousedown|mousemove|mouseout|mouseover|mouseup|mousewheel|scroll|abort|canplay|canplaythrough|durationchange|emptied|ended|error|loadeddata|loadedmetadata|loadstart|pause|play|playing|progress|ratechange|readystatechange|seeked|seeking|stalled|suspend|timeupdate|volumechange|waiting)\s*=\s*(\"|&#39;)?\S*(\"|&#39;)?/i",
 
        //html 屬性包含腳本
        "/\w+\s*=\s*(\"|&#39;)?(java|vb)script:\S*(\"|&#39;)?/i",
 
        //js 對象
        "/(document|location)\s*\.\s*\S*/i",
 
        //js 函數(shù)
        "/(eval|alert|prompt|msgbox)\s*\(.*\)/i",
 
        //css
        "/expression\s*:\s*\S*/i",
 
        /* -------- sql 注入 --------*/
 
        //顯示 數(shù)據(jù)庫 | 表 | 索引 | 字段
        "/show\s+(databases|tables|index|columns)/i",
 
        //創(chuàng)建 數(shù)據(jù)庫 | 表 | 索引 | 視圖 | 存儲過程 | 存儲過程
        "/create\s+(database|table|(unique\s+)?index|view|procedure|proc)/i",
 
        //更新 數(shù)據(jù)庫 | 表
        "/alter\s+(database|table)/i",
 
        //丟棄 數(shù)據(jù)庫 | 表 | 索引 | 視圖 | 字段
        "/drop\s+(database|table|index|view|column)/i",
 
        //備份 數(shù)據(jù)庫 | 日志
        "/backup\s+(database|log)/i",
 
        //初始化 表
        "/truncate\s+table/i",
 
        //替換 視圖
        "/replace\s+view/i",
 
        //創(chuàng)建 | 更改 字段
        "/(add|change)\s+column/i",
 
        //選擇 | 更新 | 刪除 記錄
        "/(select|update|delete)\s+\S*\s+from/i",
 
        //插入 記錄 | 選擇到文件
        "/insert\s+into/i",
 
        //sql 函數(shù)
        "/load_file\s*\(.*\)/i",
 
        //sql 其他
        "/(outfile|infile)\s+(\"|&#39;)?\S*(\"|&#39;)/i",
    );
 
    $_str_return = $str_string;
    //$_str_return = urlencode($_str_return);
 
    foreach ($_arr_dangerChars as $_key=>$_value) {
        $_str_return = str_ireplace($_value, "", $_str_return);
    }
 
    foreach ($_arr_dangerRegs as $_key=>$_value) {
        $_str_return = preg_replace($_value, "", $_str_return);
    }
 
    $_str_return = htmlentities($_str_return, ENT_QUOTES, "UTF-8", true);
 
    return $_str_return;
}