php - 从时间戳中获取 Graph lib php 的 SQL 当前日期

Question

所以我已经设置了代码来显示来自 php sql 的图形。但我似乎无法在今天之前从我表中的时间戳订购它。这是我的代码：

<?php
include("phpgraphlib.php");
$graph=new PHPGraphLib(550,450);

$link = mysql_connect('xxx', 'xxx', 'xxx')
or die('Could not connect: ' . mysql_error());

mysql_select_db('test') or die('Could not select database');

$dataArray=array();

//get data from database
// $sql="SELECT rating, COUNT(*) AS 'datentry' FROM main_table GROUP BY rating";

$sql="SELECT rating, COUNT(*) AS 'datentry' FROM main_table GROUP BY rating";


$result = mysql_query($sql) or die('Query failed: ' . mysql_error());
if ($result) {
while ($row = mysql_fetch_assoc($result)) {
  $salesgroup=$row["rating"];
  $count=$row["datentry"];
  //add to data areray
  $dataArray[$salesgroup]=$count;
 }
}


//configure graph
$graph->addData($dataArray);
$graph->setTitle("Daily");
$graph->setGradient("lime", "green");
$graph->setBarOutlineColor("black");
$graph->createGraph();
?>

我想要实现的是能够只显示今天的数据。此特定代码显示我的表中的所有数据。