确定while循环中有多少个项目

Question

How can I determine how many items there are in a while Loop?

Example :

while ($row = mysql_fetch_array($query)){


echo "<strong>name:</strong> ".$row['name']."<br>";
echo "<strong>country:</strong> ".$row['country']."<br>";
echo "<strong>house:</strong> ".$row['house']."<br>";
}

Output :

Name: Example Name

Country: Germany

House : Example street 1

House 2 : Example street 3

House 3 : Example street 5

I need to know this because I want to add the number behind house 2/3 as a variable. Should I place the while loop in a for loop so I can add:

$housenumber++;

echo "<strong>house ".$housenumber.":</strong> ".$row['house']."<br>";

Answer 1

You can use

$total = mysql_num_rows($query);

To find out the total number of rows in the while loop.

Declare this before your while loop and after $query is defined.

However, I should point out that mysql_query and mysql_num_rows are deprecated and you should use MySQLi or PDO. See here for more information.

Answer 2

Wrapping a loop inside a loop won't accomplish what you're getting at (or it might, but it's just needless overkill). Incrementing a variable works in any kind of loop, so you could just write:

$housenumber = 0;
while ($row = mysql_fetch_array($query)){
  echo "<strong>name:</strong> ".$row['name']."<br>";
  echo "<strong>country:</strong> ".$row['country']."<br>";
  echo "<strong>house ".$housenumber.":</strong> ".$row['house']."<br>";
  $housenumber++;
}

As Tom is saying you're using deprecated functions to retrieve MySQL data, so your code will cease to work in future versions of PHP.