Question

Can someone explain what is happening in each line?:

function HW1a($array1 )
{
do
{
$sw = false;
for( $i = 0, $c = count( $array1 ) - 1; $i < $c; $i++ )
{
if( $array1[$i] > $array1[$i + 1] )
{
list( $array1[$i + 1], $array1[$i] ) =
array( $array1[$i], $array1[$i + 1] );
$sw = true;
}
}
}
while( $sw );
return $array1;
}
$array2 = array(3, 0, 2, 5, -1, 4, 1);
echo "Original Array :\n";
echo implode(', ',$array2 );
echo "\nOther Array\n:";
echo implode(', ',HW1a($array2)). PHP_EOL;

Answer 1

<?php
// in this method we are soring the array from lowest to highest
function HW1a($array1 )
{
do
{
$sw = false;
for( $i = 0, $c = count( $array1 ) - 1; $i < $c; $i++ )
{
// if current element is greater than next element than swapping

// using bubble sort to sort the values
if( $array1[$i] > $array1[$i + 1] )
{
list( $array1[$i + 1], $array1[$i] ) =
array( $array1[$i], $array1[$i + 1] );

// making a flue to ensure swapping is occured
$sw = true;
}
}
}
while( $sw );
return $array1;
}
// delcared the array with elements
$array2 = array(3, 0, 2, 5, -1, 4, 1);
// printing the original array
echo "Original Array :";
echo implode(', ',$array2 );
// calling HW1a method to sort the array and printing the values
echo "\nanOther Arrayn:";
echo implode(', ',HW1a($array2)). PHP_EOL;
?>