How to remove line breaks (no characters!) from the string?

There are a few different ways to remove line breaks from a string in PHP. Here are two options:

1. Use the str_replace function:

How to remove line breaks from a string in PHP?

<?php

$string = "This is a string\nwith line breaks.";
$string = str_replace(["\r\n", "\r", "\n"], ' ', $string);
echo $string; // Outputs: "This is a string with line breaks."

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2. Use the preg_replace function with a regular expression that matches line breaks:

How to remove line breaks from a string in PHP with a regular expression?

<?php

$string = "This is a string\nwith line breaks.";
$string = preg_replace('/[\r\n]+/', ' ', $string);
echo $string; // Outputs: "This is a string with line breaks."

Note that the regular expression /[\r\n]+/ matches both Windows-style (\r\n) and Unix-style (\n) line breaks. These examples replace line breaks with a space. To remove them entirely, replace ' ' with ''.