program to sort a list of contacts with Bubble sort

bubble_sort.php

<?php
$contact_info = array(
	'Zeeshan '  => ' 03332490820',
	'Bilal '    => ' 03332490895',
	' Danish  ' => ' 03332490673',
	'Sami'      => ' 03332490165',
	'Ahmed'     => ' 03332490090',
	' Batool '  => ' 03332490554',
	'Owais  '   => ' 03332490967',
	'Ahsan '    => ' 03332490534',
	'Ehsan'     => ' 03332490899',
	' Imtiaz '  => '03332490678',
);

$sorted_array = array();
function sort_contact_info( $contact_info ) {

	$no_of_contacts = count( $contact_info ) - 1;

	for ( $step = 0; $step < $no_of_contacts; $step++ ) {
		for ( $position = 0; $position < $no_of_contacts - $step; $position++ ) {

			if ( $contact_info[ $position ] > $contact_info[ $position + 1 ] ) {
				$tmp                           = $contact_info[ $position + 1 ];
				$contact_info[ $position + 1 ] = $contact_info[ $position ];
				$contact_info[ $position ]     = $tmp;
			}
		}
	}

	return $contact_info;
}

// Remove whitespace from array keys and values
foreach ( $contact_info as $name => $contact_no ) {
	$name                            = trim( $name );
	$contact_no                      = trim( $contact_no );
	$formatted_contact_info[ $name ] = $contact_no;
}

$contact_names = array_keys( $formatted_contact_info );

$sorted_contact_names = sort_contact_info( $contact_names );

foreach ( $sorted_contact_names as $key => $name ) {
	unset( $sorted_contact_names[ $key ] );
	$sorted_contact_names[ $name ] = $formatted_contact_info[ $name ];
}
?>
<h3> Sorted Contact List </h3>
<?php foreach ( $sorted_contact_names as $name => $contact_no ) : ?>
	<p>
		<?php echo $name . ' : ' . $contact_no; ?>
	</p>
	<?php
endforeach;

function sort_contacts_by_name( $contact_names ) {
				$number_of_contacts = count( $contact_names );

	for ( $pass_number = 0; $pass_number < $number_of_contacts - 1; $pass_number++ ) {
		for ( $position = 0; $position < $number_of_contacts - $pass_number - 1; $position++ ) {
			// Use strcasecmp for case-insensitive comparison
			$name_1 = $contact_names[ $position ];
			$name_2 = $contact_names[ $position + 1 ];

			if ( strcasecmp( $name_1, $name_2 ) > 0 ) {
				//if ( $name_1 > $name_2 ) {
				// Swap values at position $position and $position + 1
				$temp_name                      = $contact_names[ $position ];
				$contact_names[ $position ]     = $contact_names[ $position + 1 ];
				$contact_names[ $position + 1 ] = $temp_name;
			}
		}
	}

	return $contact_names;
}

// Dummy contact list
$contacts = array(
	'Zeeshan '  => ' 03332490820',
	'Bilal '    => ' 03332490895',
	' Danish  ' => ' 03332490673',
	'Sami'      => ' 03332490165',
	'Ahmed'     => ' 03332490090',
	' Batool '  => ' 03332490554',
	'Owais  '   => ' 03332490967',
	'Ahsan '    => ' 03332490534',
	'Ehsan'     => ' 03332490899',
	' Imtiaz '  => '03332490678',

	'aziz'      => '03332490671',
);

// Format contacts and remove extra spaces
foreach ( $contacts as $contact_name => $contact_no ) {
	$contacts_formatted[ trim( $contact_name ) ] = trim( $contact_no );
}

$contacts = $contacts_formatted;

// Sort the contact list using bubble sort
$sorted_names = sort_contacts_by_name( array_keys( $contacts ) );

// Create a new array with sorted keys and corresponding values
$sorted_contacts = array();
foreach ( $sorted_names as $name ) {
	$sorted_contacts[ $name ] = $contacts[ $name ];
}

?>
<h3>Sorted Contact List:</h3>
<br />
<?php foreach ( $sorted_contacts as $name => $contact_no ) : ?>
	<?php
		// Print the sorted list
		echo $name . " => $contact_no <br />";
	?>
<?php endforeach ?>