Number Pattern 32 in PHP

Beginner
⏱️ 5 min read
📚 Updated: Aug 2025
🎯 2 Code Examples
Nested Loops
PHP Number Pattern 32 output (starts from 11 and increases each row)

What You’ll Learn

How to print Number Pattern 32 in PHP using nested loops. Each row prints a growing sequence that starts at 11 and increases based on the row ($i) and column ($j) positions.

You’ll also learn how to generalize the same logic for a user-defined row count in a CLI version.

⭐ Pattern Output

For $rows = 5, the pattern looks like this:

Output
11
12 13
13 14 15
14 15 16 17
15 16 17 18 19
1

Complete PHP Program

The outer loop controls rows. The inner loop prints $i numbers in row $i, using the value formula 9 + $i + $j.

PHP
<?php
$rows = 5;

for ($i = 1; $i <= $rows; $i++) {
    for ($j = 1; $j <= $i; $j++) {
        echo (9 + $i + $j) . " ";
    }
    echo PHP_EOL;
}

🧠 How It Works

1

Choose the row count

$rows = 5; sets how many lines will be printed.

Setup
2

Outer loop (row control)

for ($i = 1; $i <= $rows; $i++) iterates from row 1 to the last row, so each next row prints one extra number.

Row control
3

Inner loop (columns 1..$i)

for ($j = 1; $j <= $i; $j++) prints exactly $i values for the current row.

Column control
4

Compute and print the number

echo (9 + $i + $j) . " "; generates the sequence starting at 11 and increasing across the row.

Number printing
=

Growing number triangle

Total printed values are 1+2+…+n = n(n+1)/2, so time complexity is O(n²) for n rows.

2

Variation — User Input (CLI) Version

Let the user decide the number of rows at runtime using standard input (run from terminal with php):

PHP
<?php
echo "Enter the number of rows: ";
$rows = (int) trim(fgets(STDIN));

if ($rows < 1) {
    exit("Rows must be at least 1." . PHP_EOL);
}

for ($i = 1; $i <= $rows; $i++) {
    for ($j = 1; $j <= $i; $j++) {
        echo (9 + $i + $j) . " ";
    }
    echo PHP_EOL;
}

💡 Tips for Enhancement

Try These

  • Validate input (reject $rows < 1) before printing the pattern
  • Change the base value 9 to shift the starting number (for example, start at 21)
  • Align the triangle by adding leading spaces before each row
  • Remove the trailing space by building each row as a string and trimming it
  • Replace numbers with characters to create alphabet patterns

Avoid

  • Forgetting to move to the next line after each row (PHP_EOL)
  • Using negative or zero rows without validation
  • Mixing row/column logic (keep the outer loop for rows)
  • Assuming user input is always valid in CLI programs

Key Takeaways

1

The outer loop controls rows from 1 to $rows.

2

The inner loop prints exactly $i numbers on row $i.

3

The printed value uses the formula 9 + i + j, which makes the first number 11.

4

Total printed values are n(n+1)/2 for n rows, so runtime is O(n²).

❓ Frequently Asked Questions

Because the value is computed as 9 + $i + $j. For $i=1 and $j=1, it becomes 9+1+1 = 11.
The inner loop runs from $j = 1 to $j = $i, so row $i prints exactly $i numbers.
Update the base in the formula. For example, replace (9 + $i + $j) with (19 + $i + $j) to start at 21.
O(n²) for n rows because the program prints 1+2+…+n values, which equals n(n+1)/2.

Explore More PHP Number Patterns!

Practice nested loops with progressively richer number patterns and variations.

All Number Patterns →
Did you know?

Since each row prints one more number than the previous, the total count after n rows is a triangular number: 1+2+…+n = n(n+1)/2.

About the author

Mari Selvan M P
Mari Selvan M P 🔗

Developer, cloud engineer, and technical writer

  • Experience 12 years building web and cloud systems
  • Focus Full Stack Development, AWS, and Developer Education

I write practical tutorials so students and working developers can learn by doing—from databases and APIs to deployment on AWS.

AWS Certified Developer – Associate (Credly)

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PHP Number Pattern 31 PHP Number Pattern 33