PHP Exercises: Create a new string using the two middle characters of a given string of even length
70. Middle Two Characters from Even-Length String
Write a PHP program to create a new string using the two middle characters of a given string of even length (at least 2).
Sample Solution:
PHP Code :
<?php
// Define a function named 'test' that extracts a substring of two characters from the middle of the input string
function test($s1)
{
// Calculate the starting index to obtain the middle two characters
return substr($s1, strlen($s1)/2 - 1, 2);
}
// Test the 'test' function with different strings and display the results
echo test("Hell")."\n";
echo test("JS")."\n";
echo test(" ")."\n";
?>
Explanation:
- Function Definition:
- A function named test is defined, which takes one parameter, $s1, representing the input string.
- Calculating the Starting Index:
- The function uses the strlen($s1)/2 - 1 expression to calculate the starting index for extracting a substring.
- This calculation determines the middle of the string:
- strlen($s1)/2 finds the midpoint.
- Subtracting 1 adjusts the index to start from one character before the midpoint.
- Extracting the Substring:
- The function then calls substr($s1, strlen($s1)/2 - 1, 2):
- This extracts a substring starting at the calculated index and retrieves 2 characters from that point.
Output:
el JS
Flowchart:

For more Practice: Solve these Related Problems:
- Write a PHP script to extract a new string consisting of the two middle characters of an even-length input.
- Write a PHP function to calculate the midpoint of a string and return the two central characters.
- Write a PHP program to check that a string’s length is even and then slice out the middle two characters.
- Write a PHP script to determine the indices for the middle characters and form a new two-character string from them.
PHP Code Editor:
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