Step by Step solution about How to resolve the algorithm 99 bottles of beer step by step in the PHP programming language

First Source Code:

The first source code is a simple PHP program that prints the lyrics to the song "99 Bottles of Beer on the Wall". The program uses a foreach loop to iterate over the numbers from 99 to 1, and for each number, it prints the corresponding verse of the song. The program uses the $plural variable to keep track of whether the word "bottle" should be singular or plural, and it uses the if statement to change the value of $plural when the number of bottles changes.

Second Source Code:
The second source code is another PHP program that prints the lyrics to the song "99 Bottles of Beer on the Wall". This program uses a foreach loop to iterate over the numbers from 99 to 1, and for each number, it prints the corresponding verse of the song using a <<<EOV heredoc. The program uses the $p variable to keep track of whether the word "bottle" should be singular or plural, and it uses the if statement to change the value of $p when the number of bottles changes.

Third Source Code:
The third source code is a PHP program that prints the lyrics to the song "99 Bottles of Beer on the Wall" using a foreach loop and a <?=$i?> echo statement for each number from 99 to 1. The program uses a ternary operator to determine whether the word "bottle" should be singular or plural, and it uses the if statement to change the value of $i when the number of bottles changes.

Fourth Source Code:
The fourth source code is a PHP program that prints the lyrics to the song "99 Bottles of Beer on the Wall" using a foreach loop and a $verse variable to store the lyrics. The program uses a preg_replace function to replace the numbers in the $verse variable with the numbers from 1 to 99. The program also uses the $verse variable to store the lyrics for the final verse of the song.

Fifth Source Code:
The fifth source code is a PHP program that prints the lyrics to the song "99 Bottles of Beer on the Wall" using a for loop and a $p2 variable to store the lyrics for each verse. The program uses the $p1 variable to store the lyrics for the first line of each verse, and the $p3 variable to store the lyrics for the third line of each verse. The program uses the if statement to change the value of $p1 when the number of bottles changes.

Sixth Source Code:
The sixth source code is a PHP program that prints the lyrics to the song "99 Bottles of Beer on the Wall" using a while loop and a $bottles variable to store the number of bottles. The program uses the printf function to print the lyrics for each verse of the song, and it uses the ngettext function to determine whether the word "bottle" should be singular or plural. The program also uses the if statement to change the value of $bottles when the number of bottles changes.

Seventh Source Code:
The seventh source code is a PHP program that prints the lyrics to the song "99 Bottles of Beer on the Wall" using a while loop and a $lyrics variable to store the lyrics. The program uses the printf function to print the lyrics for each verse of the song, and it uses the sprintf function to format the lyrics for the final verse of the song. The program also uses the $x variable to store the number of bottles, and it uses the if statement to change the value of $x when the number of bottles changes.

<?php
$plural = 's';
foreach (range(99, 1) as $i) {
    echo "$i bottle$plural of beer on the wall,\n";
    echo "$i bottle$plural of beer!\n";
    echo "Take one down, pass it around!\n";
    if ($i - 1 == 1)
        $plural = '';
    
    if ($i > 1)
        echo ($i - 1) . " bottle$plural of beer on the wall!\n\n";
    else
        echo "No more bottles of beer on the wall!\n";
}
?>

<?php
foreach(range(99,1) as $i) {
    $p = ($i>1)?"s":"";
    echo <<< EOV
$i bottle$p of beer on the wall
$i bottle$p of beer
Take one down, pass it around


EOV;
}
echo "No more Bottles of beer on the wall";
?>

<?php foreach(range(99,1) as $i):?>
<?=$i?> bottle<?=$i==1 ? '' : 's'?> of beer on the wall,
<?=$i?> bottle<?=$i==1 ? '' : 's'?> of beer!
Take one down, pass it around...
<?php if($i > 1):?>
<?=$i-1?> bottle<?=$i==1 ? '' : 's'?> of beer on the wall!
<?php else:?>
No more bottles of beer on the wall!
<?php endif?>
<?php endforeach?>

<?php
$verse = <<<VERSE
100 bottles of beer on the wall,
100 bottles of beer!
Take one down, pass it around!
99 bottles of beer on the wall!


VERSE;

foreach (range(1,99) as $i) { // loop 99 times
    $verse = preg_replace('/\d+/e', '$0 - 1', $verse);
    $verse = preg_replace('/\b1 bottles/', '1 bottle', $verse);
    $verse = preg_replace('/\b0 bottle/', 'No bottles', $verse);

    echo $verse;
}
?>

<?php
  for($i=100;$i>0;$i--){
    $p2=$i." bottle".(($i>1)?"s":"")." of beer";
    $p1=$p2." on the wall\n";
    $p3="Take one down, pass it around\n";
    echo (($i<100)?$p1."\n":"").$p1.$p2."\n".$p3.(($i<2)?($i-1).substr($p1,1,28):"");
  }

<?php

$bottles = 99;

while ($bottles > 0) {
	printf(ngettext('%d bottle', '%d bottles', $bottles) . " of beer on the wall\n", $bottles);		//X bottles of beer on the wall
	printf(ngettext('%d bottle', '%d bottles', $bottles) . " of beer\n", $bottles);				//X bottles of beer
	printf("Take one down, pass it around\n");										//Take one down, pass it around

	$bottles--;

	if ($bottles > 0) {
		printf(ngettext('%d bottle', '%d bottles', $bottles) . " of beer on the wall\n\n", $bottles);	//X bottles of beer on the wall
	}
}
printf('No more bottles of beer on the wall');											//No more bottles of beer on the wall

<?php

$lyrics = <<<ENDVERSE
%2\$d bottle%1\$s of beer on the wall
%2\$d bottle%1\$s of beer
Take one down, pass it around
%4\$s bottle%3\$s of beer on the wall


ENDVERSE;

$x = 99;
while ( $x > 0 ) {
   printf( $lyrics, $x != 1 ? 's' : '', $x--, $x != 1 ? 's' : '', $x > 0 ? $x : 'No more' );
}