Pattern Display Problems in PHP

The following post provides several Pattern Display Problems in PHP with their solutions.

1. Print a pattern of stars in a pyramid shape:

<?php
for($i=1; $i<=5; $i++){
  for($j=1; $j<=5-$i; $j++){
    echo "&nbsp;";
  }
  for($k=1; $k<=$i; $k++){
    echo "*&nbsp;";
  }
  echo "<br/>";
}
?>

Output:

    *
   * *
  * * *
 * * * *
* * * * *

2. Print a pattern of numbers in a pyramid shape:

<?php
for($i=1; $i<=5; $i++){
  for($j=1; $j<=5-$i; $j++){
    echo "&nbsp;";
  }
  for($k=1; $k<=$i; $k++){
    echo $k."&nbsp;";
  }
  echo "<br/>";
}
?>

Output:

    1
   1 2
  1 2 3
 1 2 3 4
1 2 3 4 5

3. Print a pattern of alphabets in a pyramid shape:

<?php
$start = ord('A');
$end = ord('E');

for($i=$start; $i<=$end; $i++){
  for($j=$start; $j<=$end-$i+$start-1; $j++){
    echo "&nbsp;";
  }
  for($k=$start; $k<=$i; $k++){
    echo chr($k)."&nbsp;";
  }
  echo "<br/>";
}
?>

Output:

    A
   A B
  A B C
 A B C D
A B C D E

4. Print a pattern of stars in a right-angled triangle shape:

<?php
for($i=1; $i<=5; $i++){
  for($j=1; $j<=$i; $j++){
    echo "*&nbsp;";
  }
  echo "<br/>";
}
?>

Output:

*
* *
* * *
* * * *
* * * * *

5. Print a pattern of numbers in a right-angled triangle shape:

<?php
for($i=1; $i<=5; $i++){
  for($j=1; $j<=$i; $j++){
    echo $j."&nbsp;";
  }
  echo "<br/>";
}
?>

Output:

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5

6. Print a pattern of alphabets in a right-angled triangle shape:

<?php
$start = ord('A');
$end = ord('E');

for($i=$start; $i<=$end; $i++){
  for($j=$start; $j<=$i; $j++){
    echo chr($j)."&nbsp;";
  }
  echo "<br/>";
}
?>

Output:

A
A B
A B C
A B C D
A B C D E

7. Print a pattern of stars in an inverted pyramid shape:

<?php
for($i=5; $i>=1; $i--){
  for($j=1; $j<=5-$i; $j++){
    echo "&nbsp;";
  }
  for($k=1; $k<=$i; $k++){
   

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Further Reading

10+ File Handling Problems in PHP

Examples of Array Functions in PHP

Exploring PHP Arrays: Tips and Tricks

Basic Programs in PHP

Exploring Arrays in PHP

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