comparing two associative array

Hello friends,
Say i am having two array : ex1 and ex2 (both are associative array)
Can i compare array ex1 's value with array ex2 's key ?
Here is the example code i am trying to implement but ..

Code:

<?php 

$marks=array('Odiy'=>'52' , 'Urdu'=>'69');



$postt=array ( 0=> array('id'=>'6', 'class_ref'=>'2nd' , 'subject_name'=>'Odiy') , 1=> array('id'=>'7', 'class_ref'=>'2nd' , 'subject_name'=>'Urdu') );

foreach($postt as $foo)
{
foreach($marks as $s)
{
if($foo['subject_name']==$s)
{
	echo "Hello";	
}
else 
echo "NOT right";
}
}
var_dump($postt);
var_dump($marks);
?>

Show it in example ?
Thanks for the reply friends.
Take Care !

 

Lets me thanks http://php.net for giving me the base for R&D.
And the most importantly to @Shabbir sir ; for letting me know that above stated query is possible.

Coming to the solution part;
U cannot compare the Key of one array with the value of another array.
If u want to then u have to first make array whose values will the key of the array u are wanting to compare.
Then compare the two values of the array (one array's value are the key for another value ).

PHP:

<?php 

$marks=array('Odiy'=>'52' , 'Urdu'=>'69');

$postt=array ( 0=> array('id'=>'6', 'class_ref'=>'2nd' , 'subject_name'=>'Odiy') , 1=> array('id'=>'7', 'class_ref'=>'2nd' , 'subject_name'=>'Urdu') );

$keys=array_keys($marks);  // Here u are changing the keys to values of another array.

foreach($postt as $foo)
{
foreach($keys as $s)
{
if($foo['subject_name']==$s)
{
    echo "Hello"."<br>";    
}
else 
continue;
}
}

?>

The above prints:
Hello
Hello
..................................................................
This is what i got if u have any please share.
Thanking you.
Good day.

 

Found another way of bypassing it.

PHP:

<?php 

$marks=array('Odiy'=>'52' , 'Urdu'=>'69');

$postt=array ( 0=> array('id'=>'6', 'class_ref'=>'2nd' , 'subject_name'=>'Odiy') , 1=> array('id'=>'7', 'class_ref'=>'2nd' , 'subject_name'=>'Urdu') );

$keys=array_keys($marks);

for($i=0;$i<count($postt);$i++)
{
for($j=0;$j<count($keys); $j++)
{
    if($j==$i)
    {
echo $postt[$i]['subject_name'];
echo $keys[$j];
    echo "<br>";    
}
else 
continue;
}
}


var_dump($marks);
var_dump($postt);
var_dump($keys);
?>

We can compare the index of the array using 'for' loop .
Did a small change that to make the the index of the marks turn to integer.
LoVe playing !
Take care !

 

Hey, try this :

Code:

<?php
  $a = array(
    "who" => "you", 
    "what" => "thing", 
    "where" => "place",
    "when" => "hour"
  );
  // the haystack array
  $b = array(
    "when" => "time", 
    "where" => "place", 
    "who" => "you",
    "what" => "thing"
  );
  $c = count(array_intersect($a, $b));
  echo $c;
?>