CODEWITHSUNDEEP
phpwhile-loop
user40037
user40037

Reputation: 35

Nested while-loops php

I am breaking my neck over this problem. So I have a text file "$file" that I am reading line by line with the first while-loop. This is working; when I echo the "$usertext" in there, it prints nicely all the lines that are in the file.

So I want to use the $usertext as a condition for my DB query and then loop through all the rows of the DB that meet that condition. Somehow only the last line of $usertext gets in the while-loop (it is the only one that gets printed when I echo $usertext in the second while-loop).

Why do not all lines of my text file go through the second while-loop?

if ($file) {
 while (($line = fgets($file)) !== false) {
  $usertext = $line;
  echo $usertext."\n";

  $result = $db->query("SELECT user, artist, artist_mbid, track, track_mbid, COUNT(*) as playcount FROM users WHERE user='$usertext' GROUP BY artist, track, user");

  while($row=$result->fetchArray()){
   echo $usertext."\n"; 
     //I also used $row["user"]; does not make any difference
  }
 } 
}

Upvotes: 0

Views: 215

Answers (2)

komodosp
komodosp

Reputation: 3658

More likely to be data not found than an SQL error as an SQL error would stop the processing.

The output of fgets(), AFAIK, includes the line break. This would mean that the contents of $usertext might contain a line break on every record except the last, so only the last call to $result->fetchArray() would give an output record and so enter the while loop.

My advice is to try changing this line:

$usertext = $line;

To 

$usertext = trim($line);

which would remove any unwanted line breaks / white space.

Upvotes: 1

Cobra_Fast
Cobra_Fast

Reputation: 16111

$result->fetchArray() might return a falsey value for some of your result sets.

Make sure $usertext is getting inserted into the query correctly and does not break it, as well as making sure there actually are rows to be returned.

Upvotes: 0

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