How to remove all non printable characters in a string?

To remove all non-printable characters in a string in PHP, you can use the preg_replace function with a regular expression pattern that matches non-printable characters.

Here's an example of how you can use preg_replace to remove all non-printable characters from a string:

How to remove all non-printable characters in a string in PHP?

<?php

$string = "This is a \r\nstring with\tnon-printable\x0Bcharacters.";

$string = preg_replace('/[\x00-\x1F\x7F]/u', '', $string);

echo $string; // Outputs: "This is a string with non-printable characters."

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The regular expression pattern /[\x00-\x1F\x7F]/u matches control characters (ASCII 0–31 and 127). The u modifier ensures the pattern works correctly with UTF-8 encoded strings, preventing corruption of multi-byte characters.

The preg_replace function replaces all matches with an empty string, effectively removing the non-printable characters from the string.