mysql - undefined variable and index in PHP -


i'm getting undefined variable , undefined index notices thought isset() should have done away with. in example i'm reading through db consisting of individuals names , companies. want separate out unique companies, know how many times represented. here's i'm expecting do:

  1. open database, count entries, load first row table.
  2. the first 'if' inside 'for' loop looks see if $comp variable hash value of company name exists. if does, increment count
  3. if $comp variable not set, first time i've seen company go 'else'.

however, isset() not seem working because php still throwing me notices line of code , variable , indexes aren't defined.

   $r1q   = mysql_query("select * totals", $db);    $r1c   = mysql_num_rows($r1q);    $r1    = mysql_fetch_array($r1q);      $title = "companies represented in db";      printf("     <div class=\"content\">     <h2>%s</h2>     <center>     <table border=1 bgcolor=#ffffff>     <tr bgcolor=#cc9933>         <th width=150>company</th>         <th width=50>times</th>     </tr>     ", $title);     // loop through 1 time each entry in db    for($j=0;$j<$r1c;$j++) {         $company = $r1[4];          // have seen company before?         if(isset($comp[$company])) {             $cnt[$company]++;             $cnt1[$company]++;         }         else {             $comp[$company] = $r1[4];             $cnt[$company]  = 1;             $cnt1[$company] = 1;         }

you should initialize arrays either:

add before loop:

 $comp = array();  $cnt = array();  $cnt1 = array();

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