Undefined offset error in PHP

[heshan]

Hi All,

 

When i try to run following PHP page, an error message displayed like this. According to my knowledge an undefined offset means the index does not exist. what could have been the possible reason in case of below code?

 

Undefined offset: 0 in C:\wamp\www\student payments reports\studentsPaymentForm.php on line 171.

Undefined offset: 0 in C:\wamp\www\student payments reports\studentsPaymentForm.php on line 172.

Undefined offset: 0 in C:\wamp\www\student payments reports\studentsPaymentForm.php on line 173.

 

<?PHP
	  //get class id
	  
	  $class_id='';
	if($stream!=null){

 $query1="select class_id from class where class_name='$class' and grade_id='$grade' and stream='$stream'";
}else{

	 $query1="select class_id from class where class_name='$class' and grade_id='$grade'";
	}
	$result1=mysql_query($query1) or die (mysql_error());
 while($row1=mysql_fetch_array($result1)){
	 $class_id=$row1['class_id'];
	 }
	 //accoding to the class id gets admission numbers

  $query1="select admission_no from student_class where class_id='$class_id' and year='$year'";
	$result1=mysql_query($query1) or die (mysql_error());
	$x=0;
 while($row1=mysql_fetch_array($result1)){
	 $x++;
	 $admission_id[$x]=$row1['admission_no'];
	 }


			//according to the admission number gets amount id

	 	for ($i=1;$i<=$x;$i++)
		{
			$query1 = "select amount_id from payment where admisssion_no='".$admission_id[$i]."'";
			$result1=mysql_query($query1) or die (mysql_error());

 			while($row1=mysql_fetch_array($result1)){

			 $amount_i[$i]=$row1['amount_id'];
			 }
		}
       
	 			//according to the amount id gets payment values

	 		for ($j=1;$j<=$x;$j++)
			{
				$query1 = "select payment_value from payment_amount where amount_id='".$amount_i[$j]."' AND date LIKE '$year-%'";
			$result1=mysql_query($query1) or die (mysql_error());

 			while($row1=mysql_fetch_array($result1)){

			 $payment_values[$j]=$row1['payment_value'];
			 }
					}

               //according to the payment values gets name with initials


				for ($l=1;$l<=$x;$l++)

		{
					$query1 = "select name_with_initial from student_info where admission_no='".$admission_id[$l]."'";
			$result1=mysql_query($query1) or die (mysql_error());

 			while($row1=mysql_fetch_array($result1)){

			 $name_with_initials[$l]=$row1['name_with_initial'];

			 }

			}








for($y=0;$y<=$x;$y++){
echo "<tr>";

// Lines showing errors

echo "<td>".$admission_id[$y]."</td>";
echo "<td>".$name_with_initials[$y]."</td>";
echo "<td>".$payment_values[$y]."</td>";
echo "</tr>";
}

       ?>

[Jessica]

You start the loops at 1 when assigning, then start at 0 when reading. So, clearly, nothing is set at the index of 0.

[heshan]

Thanks a lot jesirose for pointing me out the error...now i have fixed it..