PHP Exercises: Concat two given strings. If the given strings have different length remove the characters from the longer string

Last update on May 28 2025 13:04:32 (UTC/GMT +8 hours)

81. Concat with Removal for Different Lengths

Write a PHP program to concat two given strings. If the given strings have different length remove the characters from the longer string.

Sample Solution:

PHP Code :

<?php
// Define a function named 'test' that concatenates two strings in a specific way
// The resulting string will have the length of the longer input string
function test($s1, $s2)
{ 
    // Check if the length of $s1 is less than the length of $s2
    if (strlen($s1) < strlen($s2))
    {
        // Concatenate $s1 with the end portion of $s2 to make their lengths equal
        return $s1 . substr($s2, strlen($s2) - strlen($s1));
    }
    // Check if the length of $s1 is greater than the length of $s2
    else if (strlen($s1) > strlen($s2))
    {
        // Concatenate the end portion of $s1 with $s2 to make their lengths equal
        return substr($s1, strlen($s1) - strlen($s2)) . $s2;
    }
    // If lengths are equal, simply concatenate the two strings
    else
    {
        return $s1 . $s2;
    }
}

// Test the 'test' function with different pairs of strings, then display the results
echo test("abc", "abcd") . "\n";
echo test("Python", "Python") . "\n";
echo test("JS", "Python") . "\n";
?>

Explanation:

Function Definition:

The function test is defined with two parameters:

$s1: the first input string.
$s2: the second input string.

Length Comparison:

The function checks the lengths of the two strings to determine how to concatenate them.

Concatenation Logic:

Case 1: If the length of $s1 is less than the length of $s2:

The function concatenates $s1 with the end portion of $s2 to make their lengths equal:
return $s1 . substr($s2, strlen($s2) - strlen($s1));

Case 2: If the length of $s1 is greater than the length of $s2:

The function concatenates the end portion of $s1 with $s2 to make their lengths equal:
return substr($s1, strlen($s1) - strlen($s2)) . $s2;

Case 3: If the lengths of $s1 and $s2 are equal:

The function simply concatenates the two strings:
return $s1 . $s2;

Output:

abcbcd
PythonPython
JSon

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to concatenate two strings after removing excess characters from the longer one until both have equal lengths.
Write a PHP function to compare two input strings and trim the longer string so that both have matching lengths before joining them.
Write a PHP program to remove characters from the end of the longer string to match the shorter string's length and then concatenate the two.
Write a PHP script to implement logic that balances two strings by truncating the longer one and then merging them.

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