Sai A Sai A
Updated date Aug 15, 2023
In this blog, we will learn how to convert ASCII to strings in PHP. Learn multiple methods to achieve the conversion.


Converting ASCII codes to their corresponding string representations is a fundamental task in many programming scenarios. In this blog, we will explore various methods to achieve this conversion using PHP.

Method 1: Using the chr() Function

The chr() function in PHP takes an ASCII code as an argument and returns the corresponding character. This method is straightforward and convenient for converting individual ASCII codes to strings. Let's take a look at an example:

$asciiCode = 65;
$character = chr($asciiCode);
echo "Character: " . $character; // Output: Character: A

Method 2: Utilizing implode() with an Array of ASCII Codes

For converting a sequence of ASCII codes to a string, we can create an array of codes and then use the implode() function to join them into a string. This approach is useful when dealing with multiple ASCII codes at once:

$asciiCodes = [72, 101, 108, 108, 111];
$characters = array_map('chr', $asciiCodes);
$resultString = implode('', $characters);
echo "Result: " . $resultString; // Output: Result: Hello

Method 3: Using a Loop

When dealing with a range of ASCII codes, such as generating a string from a specific starting code to an ending code, a loop can be an effective solution. This method provides greater flexibility and control:

$start = 97; // ASCII code for 'a'
$end = 122;  // ASCII code for 'z'
$result = '';

for ($i = $start; $i <= $end; $i++) {
    $result .= chr($i);

echo "Alphabet: " . $result; // Output: Alphabet: abcdefghijklmnopqrstuvwxyz

Method 4: Using array_reduce() for Concatenation

The array_reduce() function can be used to iteratively concatenate characters while converting ASCII codes to a string. This method offers a different perspective on solving the problem:

$asciiCodes = [72, 101, 108, 108, 111];
$resultString = array_reduce($asciiCodes, function ($carry, $code) {
    return $carry . chr($code);
}, '');

echo "Result: " . $resultString; // Output: Result: Hello


In this blog, we have learned how to convert ASCII codes to strings in PHP. We explored four distinct methods, each with its strengths and use cases. The chr() function proved to be a simple and direct approach for individual conversions, while the array-based methods (using implode(), loops, and array_reduce()).

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