PHP常用函数汇总

function p($var)
{
    if (is_bool($var)) {
        var_dump($var);
    } else if (is_null($var)) {
        var_dump(NULL);
    } else {
        echo "<pre style='position:relative;z-index:1000;padding:10px;border-radius:5px;background:#F5F5F5;border:1px solid #aaa;font-size:14px;line-height:18px;opacity:0.9;'>" . print_r($var, true) . "</pre>";
    }
}

function fn_formatdate($time){     
    $rtime = date("Y-m-d H:i",$time);     
    $htime = date("H:i",$time);           
    $time  = time() - $time;       
    if ($time < 60){         
            $formatime = '刚才';     
    }elseif($time < 60 * 60){         
            $min = floor($time/60);         
            $formatime = $min.'分钟前';     
    }elseif($time < 60 * 60 * 24){         
            $h = floor($time/(60*60));         
            $formatime = $h.'小时前';     
    }elseif($time < 60 * 60 * 24 * 3){         
            $d = floor($time/(60*60*24));         
            if($d==1){
                    $formatime = '昨天 '.$htime;
            }else{
                    $formatime = '前天 '.$htime;     
            }
    }else{         
            $formatime = $rtime;     
    }     
    return $formatime; 
}

function fn_curl_post($uri,$data){
    // 参数数组
    $ch = curl_init ();
    // print_r($ch);
    curl_setopt ( $ch, CURLOPT_URL, $uri );
    curl_setopt ( $ch, CURLOPT_POST, 1 );
    curl_setopt ( $ch, CURLOPT_HEADER, 0 );
    curl_setopt ( $ch, CURLOPT_RETURNTRANSFER, 1 );
    curl_setopt ( $ch, CURLOPT_POSTFIELDS, $data );
    $return = curl_exec ( $ch );
    curl_close ( $ch );
    return $return;
}

function format_str1($str){
    $str = str_replace("\r\n","",$str);
    $str = str_replace("\n","",$str);
    $str = str_replace("\r","",$str);
    $str = str_replace("'","'",$str);
    $str = str_replace("\"","б▒",$str);
    $str = str_replace("<","г╝",$str);
    $str = str_replace(">","г╛",$str);
    $str = str_replace("php","",$str);
  //$str = str_replace("?","г┐",$str);
    $str = str_replace("eval","",$str);
    $str = str_replace("%","ге",$str);
    $str = str_replace("$","",$str);
    $str = str_replace("script"," ",$str);
  //$str = str_replace("="," ",$str);
    $str = str_replace("and"," ",$str);
    $str = str_replace("select"," ",$str);
    $str = str_replace("delete"," ",$str);
    $str = str_replace("update"," ",$str);
    return $str;
}

function getIP(){
    static $realip;
    if (isset($_SERVER)){
        if (isset($_SERVER["HTTP_X_FORWARDED_FOR"])){
            $realip = $_SERVER["HTTP_X_FORWARDED_FOR"];
        } else if (isset($_SERVER["HTTP_CLIENT_IP"])) {
            $realip = $_SERVER["HTTP_CLIENT_IP"];
        } else {
            $realip = $_SERVER["REMOTE_ADDR"];
        }
    } else {
        if (getenv("HTTP_X_FORWARDED_FOR")){
            $realip = getenv("HTTP_X_FORWARDED_FOR");
        } else if (getenv("HTTP_CLIENT_IP")) {
            $realip = getenv("HTTP_CLIENT_IP");
        } else {
            $realip = getenv("REMOTE_ADDR");
        }
    }
    return $realip;
}

function CheckUserID($uid, $msgtitle='用户名'){
    //系统字符限制
    $cfg_mb_notallow = 'www,bbs,ftp,mail,user,users,admin,administrator';
    $nas = explode(',', $cfg_mb_notallow);
    if(in_array($uid, $nas))
    {
        return $msgtitle.'为系统禁止的标识！';
    }

    $ck_uid = $uid;
    for($i=0; isset($ck_uid[$i]); $i++){
        if(ord($ck_uid[$i]) > 0x80){
            if(isset($ck_uid[$i+1]) && ord($ck_uid[$i+1])>0x40){
                $i++;
            }else{
                return $msgtitle.'可能含有乱码，建议你改用英文字母和数字组合！';
            }
        }else{
            if(preg_match("/[^0-9a-z@\.-_]/i",$ck_uid[$i])){
                return $msgtitle.'不能含有 [@]、[.]、[-]以外的特殊符号！';
            }
        }
    }
    return 'ok';
}

//sql注入
function inject_check($sql_str) { 
    return eregi('select|insert|and|or|update|delete|\'|\/\*|\*|\.\.\/|\.\/|union|into|load_file|outfile', $sql_str);
} 
//sql注入
function verify_id($id=null) { 
    if(!$id) {
        exit('没有提交参数！'); 
    } elseif(inject_check($id)) { 
        exit('提交的参数非法！');
    } elseif(!is_numeric($id)) { 
        exit('提交的参数非法！'); 
    } 
    $id = intval($id); 
    return $id; 
}
//替换(移除)sql接受参数的特殊字符
function removeSQL($val){
    $val=mysql_escape_string(trim($val));
    $arr=array("'",";","=","*","delete","alter","select","and ","or ","update","unique","show","set ");
    foreach ($arr as $v) {
        $val=str_ireplace($v,"",$val); 
    }
    return $val;
}