PHP Exercises: Insert a given string into middle of the another given string of length 4

Last update on May 28 2025 13:05:06 (UTC/GMT +8 hours)

60. Insert String into Middle

Write a PHP program to insert a given string into middle of the another given string of length 4.

Sample Solution:

PHP Code :

<?php
// Define a function named 'test' that inserts a word into a string at a specific position
function test($s1, $word)
{
    // Use substr to concatenate the first two characters of s1, followed by the 'word', and then the rest of s1
    return substr($s1, 0, 2) . $word . substr($s1, 2);
}

// Test the 'test' function with different input strings and display the results
echo test("[[]]", "Hello")."\n";
echo test("(())", "Hi");
?>

Explanation:

Function Purpose:

The test function takes two parameters, $s1 (a string) and $word (a string to insert), and inserts $word into $s1 at the third position (after the first two characters).

Insertion Logic:

The function uses substr to split $s1 into two parts:

The first two characters of $s1 (substr($s1, 0, 2)).
The rest of $s1 from the third character onward (substr($s1, 2)).

It then concatenates the parts: the first two characters of $s1, followed by $word, followed by the rest of $s1.

Output:

[[Hello]]
((Hi))

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to insert a given string into the center of another string that has a fixed length of 4 characters.
Write a PHP function to splice one string into the middle of a four-character string and output the result.
Write a PHP program to combine two strings by embedding the longer string into the exact middle of a four-character pattern.
Write a PHP script to calculate the midpoint of a fixed-length string and insert an input substring at that position.

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