How Can I Compare Array One Row Value To Another Rows Value In Php

Question

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In this i fetch data from mysql database and store into $row[] array then try to compare array value but it doesn't work:

mytable:

bloodbank_id|date  |time |bloodgroup|quantity
   1        |1-1-12|12:00| A+       | 10
   1        |1-1-12|12:00| B+       | 1
   1        |1-1-12|12:00| O+       | 9
   2        |1-1-12|12:00| A+       | 1
   2        |1-1-12|12:00| B+       | 10

i try to compare bloodbank_id but not work

this is my code with output:
this my code:

PHP

while($row=mysqli_fetch_assoc($select)){
			$toarr[]=$row;
			foreach($row as $value){
			echo $value.'<br>';
		}
		}
		
		$count=count($toarr);
		/*echo 'Array size'.$count;*/
		/*print_r($toarr);*/
		
		
		For($i=0,$j=0;$i<$count;$i++){
			if($toarr[$j]['bloodbank_id']===$toarr[$i+1]['bloodbank_id']){
				echo 'match==>'.$toarr[$j]['bloodbank_id'].'='.$toarr[$i+1]['bloodbank_id'].'<br>';
			}else{
				echo 'not match==>'.$toarr[$j]['bloodbank_id'].'='.$toarr[$i+1]['bloodbank_id'].'<br>';
				$j=$i;
				echo 'j='.$j;
			}
		}

output:

// print data which store in array
1
2014-04-27
14:30:09
A+
10

1
2014-04-27
14:30:24
B+
10

1
2014-04-27
14:46:05
AB+
1

3
2014-04-27
14:32:14
AB+
10

match==>1=1// first row match with next row
match==>1=1
not match==>1=3 //if not match then assign $i value to $j
j=2
Notice: Undefined offset: 4 in C:\xampp\htdocs\AES\blood.php on line 24

Notice: Undefined offset: 4 in C:\xampp\htdocs\AES\blood.php on line 27
not match==>1=
j=3

error in for loop condition not exit after $i=4

Posted 28-Apr-14 17:56pm

priyanshbhaliya

Updated 28-Apr-14 18:38pm

v3

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Comments

Sergey Alexandrovich Kryukov 29-Apr-14 0:11am

In a loop, elements one by one. What have you tried?
—SA

priyanshbhaliya 29-Apr-14 0:39am

here i put my code please check it correct little error.. solve it

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priyanshbhaliya · Accepted Answer · 2014-04-28T19:14:00

i solve it:

PHP

$count=count($toarr);
		/*echo 'Array size'.$count;*/
		/*print_r($toarr);*/
		For($i=1,$j=0;$i<$count;$i++){
			echo 'j='.$j.'  i='.$i.'     ';
			echo $toarr[$j]['bloodbank_id'].' '.$toarr[$i]['bloodbank_id'];
			if($toarr[$j]['bloodbank_id']==$toarr[$i]['bloodbank_id']){
				echo '   match <br>';
			}else{
				echo ' not match  ';
				$j=$i;
				echo 'j='.$j.'<br>';
			}
			
		}
</br></br>