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

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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

الأجوبة

<?php
function test($s)
{
    $last_two_char = substr($s, strlen($s)-2, 2);
    $ctr = 0;

    for ($i = 0; $i < strlen($s)-2; $i++)
        {
           if (substr($s, $i, 2) == $last_two_char) 
           $ctr = $ctr +1;
        }
    return $ctr;
 }

echo test("abcdsab")."\n";
echo test("abcdabab")."\n";
echo test("abcabdabab")."\n";
echo test("abcabd")."\n";

Sample Output:

1
2
3
0
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أسئلة مشابهة

Write a PHP program to create a new string taking the first 3 characters of a given string and return the string with the 3 characters added at both the front and back. If the given string length is less than 3, use whatever characters are there
Write a PHP program to create a new string from a given string. If the two characters of the given string from its beginning and end are same return the given string without the first two characters otherwise return the original string
Write a PHP program to create a new string of length 2, using first two characters of a given string. If the given string length is less than 2 use '#' as missing characters
Write a PHP program to check if a string 'yt' appears at index 1 in a given string. If it appears return a string without 'yt' otherwise return the original string

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