This article is aimed at giving a PHP implementation for pattern printing.
Simple Pyramid Pattern
PHP
<?php// Php code to demonstrate// star pattern// Function to demonstrate// printing patternfunction pypart($n){ // Outer loop to handle number // of rows in this case for ($i = 0; $i < $n; $i++) { // inner loop to handle // number of columns // values changing acc. // to outer loop for($j = 0; $j <= $i; $j++ ) { // Printing stars echo "* "; } // ending line after // each row echo "\n"; }} // Driver Code $n = 5; pypart($n);?> |
Output :
* * * * * * * * * * * * * * *
Time Complexity: The time complexity of this algorithm is O(N^2) where N is the number of rows.
Space Complexity: The space complexity of this algorithm is O(1) because only a fixed amount of memory is used.
After 180 degree rotation
PHP
<?php// PHP code to demonstrate// star pattern// Function to demonstrate// printing patternfunction pypart2($n){ for ($i = 1; $i <= $n; $i++) { for ($j = 1; $j <= $n; $j++) { if($j<=($n-$i)){ echo " "." "; }else { echo "* "; } } echo PHP_EOL; } } // Driver Code $n = 5; pypart2($n);?> |
Output :
*
* *
* * *
* * * *
* * * * *
Time Complexity: O(N^2) where N is the number of rows.
Space Complexity: O(1) because only a fixed amount of memory is used.
Printing Triangle
PHP
<?php// PHP code to demonstrate// star pattern// Function to demonstrate // printing patternfunction triangle($n){ // number of spaces $k = 2 * $n - 2; // outer loop to handle // number of rows // n in this case for ($i = 0; $i < $n; $i++) { // inner loop to handle // number spaces // values changing acc. // to requirement for ($j = 0; $j < $k; $j++) echo " "; // decrementing k after // each loop $k = $k - 1; // inner loop to handle // number of columns // values changing acc. // to outer loop for ($j = 0; $j <= $i; $j++ ) { // printing stars echo "* "; } // ending line after // each row echo "\n"; }} // Driver Code $n = 5; triangle($n); ?> |
Output :
* * * * * * * * * * * * * * *
Time complexity: O(N^2) where N is given number of rows
Auxiliary Space: O(1)
Star Triangle Pattern 2
PHP
<?php // code// PHP code to demonstrate// star pattern 2// Function to demonstrate // printing pattern 2function triangle_pattern($len){$string="*";$pyramid_str="";$mid_point=ceil($len/2);for($i=1;$i<=$mid_point;$i++){ for($j = 1; $j <= $i; ++$j) { $pyramid_str.=$string." "; } $pyramid_str.="\r\n";}for($i=$mid_point;$i>=1;$i--){ for($j = 1; $j < $i; ++$j) { $pyramid_str.=$string." "; } $pyramid_str.="\r\n"; }return $pyramid_str;}echo triangle_pattern(9);?> |
Output
* * * * * * * * * * * * * * * * * * * * * * * * *
Time Complexity: O(n^2), where n is the input parameter.
Space Complexity: O(n), where n is the input parameter.
Number Pattern
PHP
<?php// PHP code to demonstrate // printing pattern of numbers// Function to demonstrate // printing patternfunction numpat($n){ // initializing starting number $num = 1; // outer loop to handle // number of rows // n in this case for ($i = 0; $i < $n; $i++) { // inner loop to handle // number of columns // values changing acc. // to outer loop for ($j = 0; $j <= $i; $j++ ) { // printing number echo $num." "; } // incrementing number // at each column $num = $num + 1; // ending line after // each row echo "\n"; }} // Driver Code $n = 5; numpat($n);?> |
Output:
1 2 2 3 3 3 4 4 4 4 5 5 5 5 5
Numbers without re assigning
PHP
<?php// PHP code to demonstrate // printing pattern of numbers// Function to demonstrate// printing patternfunction numpat($n){ // initialising starting // number $num = 1; // outer loop to handle // number of rows // n in this case for ($i = 0; $i < $n; $i++) { // inner loop to handle // number of columns // values changing acc. // to outer loop for ($j = 0; $j <= $i; $j++ ) { // printing number echo $num." "; // incrementing number // at each column $num = $num + 1; } // ending line after // each row echo "\n"; }} // Driver Code $n = 5; numpat($n);?> |
Output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Character Pattern
PHP
<?php// PHP code to demonstrate printing// pattern of alphabets// Function to demonstrate // printing patternfunction alphapat($n){ // initializing value // corresponding to 'A' // ASCII value $num = 65; // outer loop to handle // number of rows // n in this case for ($i = 0; $i < $n; $i++) { // inner loop to handle // number of columns // values changing acc. // to outer loop for ($j = 0; $j <= $i; $j++ ) { // explicitly converting // to char $ch = chr($num); // printing char value echo $ch." "; } // incrementing number $num = $num + 1; // ending line after // each row echo "\n"; }} // Driver Code $n = 5; alphapat($n); ?> |
Output:
A B B C C C D D D D E E E E E
Continuous Character pattern
PHP
<?php// PHP code to demonstrate printing// pattern of alphabets// Function to demonstrate// printing patternfunction contalpha($n){ // initializing value // corresponding to 'A' // ASCII value $num = 65; // outer loop to handle // number of rows // n in this case for ($i = 0; $i < $n; $i++) { // inner loop to handle // number of columns // values changing acc. // to outer loop for ($j = 0; $j <= $i; $j++ ) { // explicitly converting // to char $ch = chr($num); // printing char value echo $ch." "; // incrementing number // at each column $num = $num + 1; } // ending line after each row echo "\n"; }} // Driver Code $n = 5; contalpha($n); ?> |
Output:
A B C D E F G H I J K L M N O
Time complexity: O(n^2) where N is given input no of rows
Auxiliary Space: O(1)
Related Article: Programs for printing pyramid patterns in C++ Programs for printing pyramid patterns in Java Programs for printing pyramid patterns in Python
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