PHP arrays - Exercises, Practice, Solution

<?php
$color = array(4 => 'white', 6 => 'green', 11=> 'red');
echo reset($color);
?>

<?php
function w3rfunction($value,$key) 
{  
	echo "$key : $value<br />";  
}  
$a = '{"Title": "The Cuckoos Calling",
      "Author": "Robert Galbraith",
	  "Detail": 
	  {
	    "Publisher": "Little Brown"
       }
	   }';
  $j1 = json_decode($a,true);
  array_walk_recursive($j1,"w3rfunction");
?>

<?php
$original = array( '1','2','3','4','5' );
echo 'Original array : <br />';
foreach ($original as $x) 
{echo "$x ";}
$inserted = '$';
array_splice( $original, 3, 0, $inserted ); 
echo " <br /> After inserting '$' the array is :<br />";
foreach ($original as $x) 
{echo "$x ";}
?>

<?php
echo "
 Associative array : Ascending order sort by value
";
$array2=array("Sophia"=>"31","Jacob"=>"41","William"=>"39","Ramesh"=>"40");
asort($array2);
foreach($array2 as $y=>$y_value)
{
	echo "Age of ".$y." is : ".$y_value."
";	
}
echo "
 Associative array : Ascending order sort by Key
";

$array3=array("Sophia"=>"31","Jacob"=>"41","William"=>"39","Ramesh"=>"40");
ksort($array3);
foreach($array3 as $y=>$y_value)
{
	echo "Age of ".$y." is : ".$y_value."
";	
}
echo "
Associative array : Descending order sorting by Value 
";

$age=array("Sophia"=>"31","Jacob"=>"41","William"=>"39","Ramesh"=>"40");
arsort($age);
foreach($age as $y=>$y_value)
{
	echo "Age of ".$y." is : ".$y_value."
";	
}
echo "
Associative array : Descending order sorting by Key 
";

$array4=array("Sophia"=>"31","Jacob"=>"41","William"=>"39","Ramesh"=>"40");
krsort($array4);
foreach($array4 as $y=>$y_value){
	echo "Age of ".$y." is : ".$y_value."
";	
}
?>

<?php
$month_temp = "78, 60, 62, 68, 71, 68, 73, 85, 66, 64, 76, 63, 81, 76, 73,
68, 72, 73, 75, 65, 74, 63, 67, 65, 64, 68, 73, 75, 79, 73";
$temp_array = explode(',', $month_temp);
$tot_temp = 0;
$temp_array_length = count($temp_array);
foreach($temp_array as $temp)
{
	$tot_temp += $temp;
}
$avg_high_temp = $tot_temp/$temp_array_length;
echo "Average Temperature is : ".$avg_high_temp."
";

sort($temp_array);
echo "<br> List of seven lowest temperatures : ";
for ($i=0; $i<5; $i++)
{
	echo $temp_array[$i].", ";
}

echo "<br>List of seven highest temperatures : ";
for ($i=($temp_array_length-5); $i<($temp_array_length); $i++)
{
	echo $temp_array[$i].", ";
}
?>

<?php
function columns($uarr)
{
	$n=$uarr;
    if (count($n) == 0)
		return array();
    else if (count($n) == 1)
        return array_chunk($n[0], 1);
    array_unshift($uarr, NULL);
    $transpose = call_user_func_array('array_map', $uarr);
    return array_map('array_filter', $transpose);
}
 
function bead_sort($uarr) {
    foreach ($uarr as $e)
        $poles []= array_fill(0, $e, 1);
    return array_map('count', columns(columns($poles)));
}
echo 'Original Array : '.'
';
print_r(array(5,3,1,3,8,7,4,1,1,3));
echo '
'.'After Bead sort : '.'
';
print_r(bead_sort(array(5,3,1,3,8,7,4,1,1,3)));
?>

<?php
$array1 = array(array(77, 87), array(23, 45));
$array2 = array("w3resource", "com");
function merge_arrays_by_index($x, $y)
{
$temp = array();
$temp[] = $x;
if(is_scalar($y))
{
$temp[] = $y;
} 
else 
{
foreach($y as $k => $v)
{
$temp[] = $v;
}
}
return $temp;
}
echo '<pre>'; print_r(array_map('merge_arrays_by_index',$array2, $array1));
?>

<?php
function array_change_value_case($input, $ucase)
{
 $case = $ucase;
 $narray = array();
  if (!is_array($input))
      {
	   return $narray;
	  }
  foreach ($input as $key => $value)
      {
  if (is_array($value))
	  {
	   $narray[$key] = array_change_value_case($value, $case);
	    continue;
      }
   $narray[$key] = ($case == CASE_UPPER ? strtoupper($value) : strtolower($value));
      }
	  return $narray;
	  }
 $Color = array('A' => 'Blue', 'B' => 'Green', 'c' => 'Red');
 echo 'Actual array </br>';
 print_r($Color);
 echo '</br>Values are in lower case.</br>';
 $myColor = array_change_value_case($Color,CASE_LOWER);
 print_r($myColor);
 echo '</br>Values are in upper case.</br>';
 $myColor = array_change_value_case($Color,CASE_UPPER);
 print_r($myColor);
?>

<?php
echo implode(",",range(200,250,4));
?>

<?php
$my_array = array("abcd","abc","de","hjjj","g","wer");
$new_array = array_map('strlen', $my_array);
// Show maximum and minimum string length using max() function and min() function
echo "The shortest array length  is " . min($new_array) .
 ". The longest array length is " . max($new_array).'.';
?>

<?php
$n=range(11,20);
shuffle($n);
  for ($x=0; $x<10; $x++)
   {    
     echo $n[$x].' ';     
   } 
?>