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Notice: Trying to access array offset on value of type null in


Flatronez
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Hello, I have inherited a website, but I can't find the php version, and when I run the website on 7.4 php, I get a lot of errors, maybe you can help?

54 $st="";
55        $stno=0;
56        $cellt = array();
57        $result = sqlsrv_query($conn, "        SELECT C.date, C.station, C.fuel, C.vmm, C.vol,  C.fmm FROM  purchase C  inner JOIN  (SELECT      D.station, D.fuel, MAX(D.DATE) as date   FROM     purchase D   GROUP BY      D.station, D.fuel) S on  C.DATE = S.date  where c.fuel!=''  order by c.station, c.fuel  ");
58       while ($row = sqlsrv_fetch_array($result))
59        {
60            if ($row[1]!=$st)
61            {
62                //$station[$stno]="";
63                if (!empty($st))
64                {
65                    for ($k=1; $k<=count($fuel); $k++)
66                    {
67                        if ($cellt[$k][0]==0)
68                            echo'<td>-</td>';
69                        else 

AND

125        for ($k=1; $k<=count($fuel); $k++)
126        {
127            if ($cellt[$k][0]==0)
128                echo'<td>-</td>';
129            else 
130            if ($cellt[$k][1]==0)
131                echo'<td><a href="levelFuel.php?station=' . $station[$stno] . '&fuel=' .  $fuel[$k] . '&type=all">' . $cellt[$k][0] . '</a></td>';
132                else if ($cellt[$k][1]==1)
133                    echo'<td class = "low"><a href="levelFuel.php?station=' . $station[$stno] . '&fuel=' .  $fuel[$k] . '&type=all">' . $cellt[$k][0] . '</a></td>';
134                        else if ($cellt[$k][1]==2)
135                            echo'<td class = "alert"><a href="levelFuel.php?station=' . $station[$stno] . '&fuel=' .  $fuel[$k] . '&type=all">' . $cellt[$k][0] . '</a></td>';
136                            else if ($cellt[$k][1]==3)
137                                echo'<td class = "water"><a href="levelFuel.php?station=' . $station[$stno] . '&fuel=' .  $fuel[$k] . '&type=all">' . $cellt[$k][0] . '</a></td>';
138        }

 

Notice: Undefined offset: 8 in C:\xampp\htdocs\levelMain.php on line 67

Notice: Trying to access array offset on value of type null in C:\xampp\htdocs\levelMain.php on line 67

Notice: Undefined offset: 8 in C:\xampp\htdocs\levelMain.php on line 67

Notice: Trying to access array offset on value of type null in C:\xampp\htdocs\levelMain.php on line 67

Notice: Undefined offset: 7 in C:\xampp\htdocs\levelMain.php on line 67

Notice: Trying to access array offset on value of type null in C:\xampp\htdocs\levelMain.php on line 67

Notice: Undefined offset: 7 in C:\xampp\htdocs\levelMain.php on line 67

Notice: Trying to access array offset on value of type null in C:\xampp\htdocs\levelMain.php on line 67

Notice: Undefined offset: 8 in C:\xampp\htdocs\levelMain.php on line 67

Notice: Trying to access array offset on value of type null in C:\xampp\htdocs\levelMain.php on line 67

Notice: Undefined offset: 8 in C:\xampp\htdocs\levelMain.php on line 127

Notice: Trying to access array offset on value of type null in C:\xampp\htdocs\levelMain.php on line 127

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Those two lines assume that something exists in $cellt when it, apparently, does not. Hard to tell why or what's going on from just this code...

Is everything behaving the way you expect it to, besides the notices?

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the code is unconditionally looping over some number of $fuel choices and expects there to be corresponding data in $cellt. IF (a big if) the data in $cellt has gaps in the 1st index, then the code should be testing if $cellt[$k] isset() before referencing it.

what does adding the the following, after the point where $cellt is being built, show -

echo '<pre>'; print_r($cellt); echo '</pre>';

this code is apparently (hard to tell without all the actual code, sample data, and desired output) outputting data for each station (starts a new section when the station value changes) and each fuel type. the code is repetitive, because it must complete the previous section when a new section is detected, and it must also complete the last section at the end. you can greatly simplify all of this by pre-fetching the data into an array and indexing/pivoting it by first the station, then the fuel. to produce the output from the pre-fetched data then just takes a couple of loops, without repetition in the code or extra variables to detect when the station changes.

you should also use associative index names for the fetched data, so you are not having to keep track of numbers.

lastly, in the code building the links, the only thing that is different is the class='...' markup. this is the only thing that should be conditional. the rest of the markup is identical and should only exist once in the code - Don't Repeat Yourself (DRY.) build the class='...' markup in a php variable, then use that variable when building the single link. you should also build the query string key/values in an array, then use http_build_query() to produce the query sting for the link.

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1 hour ago, requinix said:

Those two lines assume that something exists in $cellt when it, apparently, does not. Hard to tell why or what's going on from just this code...

Is everything behaving the way you expect it to, besides the notices?

 

everything seems fine, I am attaching the whole code, maybe your eyes will see the bug

levelmain.php.txt

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if you do this -

2 hours ago, mac_gyver said:

by pre-fetching the data into an array and indexing/pivoting it by first the station, then the fuel.

a majority of this code will go away.

assuming i decoded what you are trying to produce as output. the following should be all the code that you need for the data table section  -

// pre-fetch the data, indexing/pivoting it using the station, then fuel as indexes
$data = [];
while ($row = sqlsrv_fetch_array($result))
{
	$data[$row['station']][$row['fuel']] = $row;
}

// produce the output
?>
<table class = "main">
<tr class="main"><td></td>
<?php
// output the heading
foreach($fuel as $fu)
{
	echo "<td class = 'main'>$fu</td>";
}
?>
<td class = "main">Atnaujinta</td></tr>

<?php
// output the data
foreach($station as $st)
{
	echo "<tr><td class='main'><a href='levelStation.php?station=$st'><b>$st</b></a></td>";
	foreach($fuel as $fu)
	{
		if(empty($data[$st][$fu]['vol']))
		{
			echo '<td>-</td>';
		}
		else
		{
			$row = $data[$st][$fu];
			$class = '';
			if ($row['fmm']<=100)
				$class = 'class="low"';
			if ($row['fmm']>100 AND $row['fmm']<250)
				$class = 'class="alert"';
			if ($row['vmm']>=5)
				$class = 'class="water"';
			
			$qs = [];
			$qs['station'] = $st;
			$qs['fuel'] = $fu;
			$qs['type'] = 'all';
			$qs = http_build_query($qs);
			
			echo "<td $class><a href='levelFuel.php?$qs'>{$row['vol']}</a></td>";
		}
	}
	echo "<td>".date_format(date_create($row['date']),"Y-m-d H:i:s")."</td></tr>\n";
}

// output the totals
?>
<tr><td>Iš viso:</td>
<?php
foreach($fuel as $fu)
{
	$sum = 0;
	foreach($station as $st)
	{
		$sum += $data[$st][$fu]['vol']??0;
	}
	echo "<td class = 'main'>$sum</td>";
}
?>
<td></td></tr>
</table>

 

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