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

Last update on December 20 2024 10:20:28 (UTC/GMT +8 hours)

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:

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

Flowchart:

PHP Code Editor:

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