PHP Exercises: Remove the character in a given position of a given string

Last update on April 16 2025 12:52:46 (UTC/GMT +8 hours)

6. Remove Character at Given Position

Write a PHP program to remove the character in a given position of a given string. The given position will be in the range 0..string length -1 inclusive.

Sample Solution:

PHP Code :

<?php
// Define a function named "test" that takes two parameters, $s and $n
function test($s, $n) 
{
    // Use the substr function to concatenate the substring of $s from index 0 to $n-1
    // with the substring of $s from index $n+1 to the end of the string
    return substr($s, 0, $n) . substr($s, $n + 1, strlen($s) - $n);
}

// Call the test function with arguments "Python" and 1, then echo the result
echo test("Python", 1) . "\n";

// Call the test function with arguments "Python" and 0, then echo the result
echo test("Python", 0) . "\n";

// Call the test function with arguments "Python" and 4, then echo the result
echo test("Python", 4) . "\n";
?>

Explanation:

• Function Definition:
• The function test takes two parameters: a string $s and an integer $n.
• Substrings and Concatenation:
• The function uses substr to:
• Extract the part of $s from the start (index 0) up to (but not including) the character at index $n.
• Concatenate this with the part of $s from index $n + 1 to the end, effectively skipping the character at index $n.
• Function Purpose:
• This function removes the character at index $n from the string $s.
• Function Calls and Output:
• First Call: test("Python", 1)
• Removes the character at index 1 ("y"), resulting in "Pthon".
• Second Call: test("Python", 0)
• Removes the character at index 0 ("P"), resulting in "ython".
• Third Call: test("Python", 4)
• Removes the character at index 4 ("o"), resulting in " Pythn".

Output:

Pthon
ython
Pythn

Visual Presentation:




Flowchart:





For more Practice: Solve these Related Problems:

• Write a PHP function to remove the character at a specified index from a string, ensuring the solution works for multi-byte characters.
• Write a PHP script to delete the character at a given position in a string without using substr_replace().
• Write a PHP program to remove a character at a specified index and rebuild the string using array manipulation functions.
• Write a PHP script to simulate character removal by splitting a string at the target index and recombining the segments.



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