php中日期时间比较三个函数

function compare_date_time( $DATE_TIME1, $DATE_TIME2 )
{
        if ( $DATE_TIME1 == NULL || strlen( $DATE_TIME1 ) == 0 || $DATE_TIME2 == NULL || strlen( $DATE_TIME2 ) == 0 )
        {
                return -1;
        }
        $DATE_TIME1_ARRY = explode( " ", $DATE_TIME1 );
        $DATE_TIME2_ARRY = explode( " ", $DATE_TIME2 );
        if ( compare_date( $DATE_TIME1_ARRY[0], $DATE_TIME2_ARRY[0] ) == 1 )
        {
                return 1;
        }
        if ( compare_date( $DATE_TIME1_ARRY[0], $DATE_TIME2_ARRY[0] ) == 0 )
        {
                if ( compare_time( $DATE_TIME1_ARRY[1], $DATE_TIME2_ARRY[1] ) == 1 )
                {
                        return 1;
                }
                if ( compare_time( $DATE_TIME1_ARRY[1], $DATE_TIME2_ARRY[1] ) == 0 )
                {
                        return 0;
                }
                return -1;
        }
        return -1;
}

function get_client_ip( )
{
        if ( getenv( "REMOTE_ADDR" ) && strcasecmp( getenv( "REMOTE_ADDR" ), "unknown" ) )
        {
                $onlineip = getenv( "REMOTE_ADDR" );
                return $onlineip;
        }
        if ( isset( $_SERVER['REMOTE_ADDR'] ) && $_SERVER['REMOTE_ADDR'] && strcasecmp( $_SERVER['REMOTE_ADDR'], "unknown" ) )
        {
                $onlineip = $_SERVER['REMOTE_ADDR'];
                return $onlineip;
        }
        if ( getenv( "HTTP_CLIENT_IP" ) && strcasecmp( getenv( "HTTP_CLIENT_IP" ), "unknown" ) )
        {
                $onlineip = getenv( "HTTP_CLIENT_IP" );
                return $onlineip;
        }
        if ( getenv( "HTTP_X_FORWARDED_FOR" ) && strcasecmp( getenv( "HTTP_X_FORWARDED_FOR" ), "unknown" ) )
        {
                $onlineip = getenv( "HTTP_X_FORWARDED_FOR" );
        }
        return $onlineip;
}

function is_ip( $IP )
{
        $IP_ARRAY = explode( ".", $IP );
        $IP_ARRAY_NUM = sizeof( $IP_ARRAY );
        if ( $IP_ARRAY_NUM != 4 )
        {
                return FALSE;
        }
        $I = 0;
        for ( ;    $I < $IP_ARRAY_NUM;    ++$I    )
        {
                if ( !is_numeric( $IP_ARRAY[$I] ) && $IP_ARRAY[$I] < 0 || 255 < $IP_ARRAY[$I] )
                {
                        return FALSE;
                }
                if ( !( $I == 3 ) && !( $IP_ARRAY[$I] == 255 ) )
                {
                        continue;
                }
                return FALSE;
        }
        return TRUE;
}

function format_money( $STR )
{
        if ( $STR == "" )
        {
                return "";
        }
        if ( $STR == ".00" )
        {
                return "0.00";
        }
        $TOK = strtok( $STR, "." );
        if ( strcmp( $STR, $TOK ) == "0" )
        {
                $STR .= ".00";
        }
        else
        {
                $TOK = strtok( "." );
                $I = 1;
                for ( ;    $I <= 2 - strlen( $TOK );    ++$I    )
                {
                        $STR .= "0";
                }
        }
        if ( substr( $STR, 0, 1 ) == "." )
        {
                $STR = "0".$STR;
        }
        return $STR;
}

// 函数名：CheckEmailAddr($C_mailaddr)

// 作 用：判断是否为有效邮件地址

// 参 数：$C_mailaddr（待检测的邮件地址）

// 返回值：布尔值

// 备 注：无

function CheckEmailAddr($C_mailaddr)

{

if (!eregi("^[_a-z0-9-]+(.[_a-z0-9-]+)*@[a-z0-9-]+(.[a-z0-9-]+)*$",

$C_mailaddr))

//(!ereg("^[_a-zA-Z0-9-]+(.[_a-zA-Z0-9-]+)*@[_a-zA-Z0-9-]+(.[_a-zA-Z0-9-]+)*$",

$c_mailaddr))

{

return false;

}

return true;

}

// 函数名：CheckWebAddr($C_weburl)

// 作 用：判断是否为有效网址

// 参 数：$C_weburl（待检测的网址）

// 返回值：布尔值

// 备 注：无

//-----------------------------------------------------------------------------------

function CheckWebAddr($C_weburl)

{

if (!ereg("^http://[_a-zA-Z0-9-]+(.[_a-zA-Z0-9-]+)*$", $C_weburl))

{

return false;

}

return true;

}