How to debug php/MySQL COUNT(id) returning 1 inste

问题:

I need the total number of entries in my database.

Question: Why does the line "print_r($rows)" return "Array ( [COUNT(id)] => 79 )" but then the line "$recordCount = Count($row); echo "
record count = " . $recordCount;" returns "record count = 1".

I've tried a massive amount of different versions of this code, but I cant type them all here or it would take forever to read. Here is the current version of the code, which is giving me the unexpected results I mention above:

// create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// check connection
if ($conn->connect_error) {
die("connection failed: " . $conn->connect_error);
}


$sql = "SELECT * FROM games ORDER BY id DESC LIMIT $startRow, $rowsPerPage";
$result = $conn->query($sql);

$sql = "SELECT COUNT(id) FROM games";
$results = $conn->query($sql);
$row = $results->fetch_assoc();
print_r($row);
$recordCount = Count($row);
echo "<br/> record count = " . $recordCount;



$totalPages = ceil($recordCount / $rowsPerPage);
$pagination = "<div class='pagination'>";

for ($i = 0; $i <= $totalPages; $i++) {
  $pagination .= "<a href='index.php?page=" . $i . "'>" . $i . "</a>";
  echo 'wtf!';
}

$pagination .= "</div>";
echo ' <br/> pagination = ' . $pagination;

THANKS TO YOU HEROES I NOW HAVE IT CORRECT: Here incase someone else in 2018 is reading online and finding lots of incorrect implementations of it:

 $sql = "SELECT COUNT(id) as countid FROM games";
$results = $conn->query($sql);
$row = $results->fetch_assoc();

$recordCount = $row["countid"]; // the countid gives me the total i expected :DDDD
echo "<br/> record count = " . $recordCount;

回答1:

row is an associative array with an entry for every column in the result set. Since there's only one column there, count($row) returns 1. Instead, you should just access the only column there:

$row = $results->fetch_assoc();
$recordCount = $row["COUNT(id)"];

回答2:

Yes, you could either aliase the column so that you can then use it as a key in associative array or since you already know that this statement:

1.$results = $conn->query($sql); looks something like this:
+-----------+
| count(id) |
+-----------+
|        13 |
+-----------+
1 row in set (0.01 sec)

2.$row = $results->fetch_assoc();returns an array with 1 element

So, you can just write $recordCount = $row[0]; to fetch that count.

The above answer is correct as well, but wanted to let you know about this direct, alternate approach in case you forget to aliase for whatever reason!