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29) Write a menu driven program in PHP to perform the following operations on associative arrays:
1. Sort the array by values (changing the keys) in ascending, descending order.
2. Also sort the array by values without changing the keys.
3. Filter the odd elements from an array.
4. Sort the different arrays at a glance using single function.
5. Merge the given arrays.
6. Find the intersection of two arrays.
7. Find the union of two arrays.
8. Find set difference of two arrays.


                       <html>

<body>

<form method="POST" action="<?php echo $_SERVER['PHP_SELF']; ?>">

Select options:


<input type="radio" value="Sort the keys" name="d1">Sorting of Keys</input>


<input type="radio" value="Sort the values" name="d1">Sorting of values</input>


<input type="radio" value="Odd elements" name="d1">Filter the odd elements</input>


<input type="radio" value="Multisort" name="d1">Sort the different arrays at a glance using single function</input>


<input type="radio" value="Merge" name="d1">Merge the Arrays</input>


<input type="radio" value="Intersection" name="d1">Intersection of two Arrays</input>


<input type="radio" value="Union" name="d1">Union of two Arrays</input>


<input type="radio" value="Difference" name="d1">Difference of two Arrays</input>


<input type="submit">


</form>


<?php

echo "
Associative ARRAY.1......";

$a = array("one"=>"1","two"=>"2","three"=>"3");

echo "
Associative ARRAY.2......
";

$a1 = array("four"=>"4","two"=>"2","six"=>"6");

if($_SERVER["REQUEST_METHOD"] == "POST")

{

$op=$_POST['d1'];


if($op == 'Sort the keys')

{

echo"Ascending order
";

sort($a);

foreach($a as $k => $v)

{

echo "Key $k Value $v 
";

}

echo"Descending order
";

rsort($a);

foreach($a as $k => $v)

{

echo "Key $k Value $v 
";

}

}

else if($op == 'Sort the values')

{

echo"Ascending order
";

asort($a);

foreach($a as $k => $v)

{

echo "Key $k Value $v 
";

}

echo"Descending order
";

arsort($a);

foreach($a as $k => $v)

{

echo "Key $k Value $v 
";

}

}

else if($op == 'Odd elements')

{

echo "Odd elements";

function test_odd($var)

{

return ($var &1);

}

print_r(array_filter($a,"test_odd"));

}

else if($op =='Multisort')

{

$b1=array_multisort($a,$a1);

print_r($b1);

}

else if($op =='Merge')

{

print_r(array_merge($a,$a1));

}

else if($op =='Intersection')

{

$r = array_intersect($a1,$a);

print_r($r);

}

else if($op =='Union')

{

$b=array_unique(array_merge($a,$a1));

print_r($b);

}

else if($op =='Difference')

{

$b1=array_diff($a,$a1);

print_r($b1);

}

}        

?>

</body>

</html>

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