PHP Exercises: Count a substring of length 2 appears in a given string and also as the last 2 characters of the string
PHP Basic Algorithm: Exercise-31 with Solution
Write a PHP program to count a substring of length 2 appears in a given string and also as the last 2 characters of the string. Do not count the end substring.
Sample Solution:
PHP Code :
<?php
// Define a function that counts the occurrences of the last two characters in substrings of the input string
function test($s)
{
// Extract the last two characters of the input string
$last_two_char = substr($s, strlen($s)-2, 2);
// Initialize a counter variable
$ctr = 0;
// Iterate through the string (excluding the last two characters)
for ($i = 0; $i < strlen($s)-2; $i++) {
// Check if the current substring matches the last two characters
if (substr($s, $i, 2) == $last_two_char) {
// Increment the counter
$ctr = $ctr + 1;
}
}
// Return the final count
return $ctr;
}
// Test the function with different input strings
echo test("abcdsab")."\n";
echo test("abcdabab")."\n";
echo test("abcabdabab")."\n";
echo test("abcabd")."\n";
?>
Sample Output:
1 2 3 0
Visual Presentation:
Flowchart:
PHP Code Editor:
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