Remove new lines from a string and replace with one empty space PHP?

In PHP, you can remove newlines from a string and replace them with spaces using several methods. The most common approaches are using preg_replace(), str_replace(), or trim() combined with regular expressions.

Problem Example

Consider this string with newlines ?

$sentence = "
My name is John Smith
My Favorite subject is PHP.
";

We need to remove the newlines and replace them with single spaces to get ?

My name is John Smith My Favorite subject is PHP.

Method 1: Using preg_replace() with trim()

This method uses regular expressions to replace multiple whitespace characters (including newlines) with a single space ?

<?php
$sentence = "
My name is John Smith
My Favorite subject is PHP.
";
$sentence = trim(preg_replace('/\s\s+/', ' ', $sentence));
echo $sentence;
?>

My name is John Smith My Favorite subject is PHP.

Method 2: Using str_replace()

A simpler approach using str_replace() to target specific newline characters ?

<?php
$sentence = "
My name is John Smith
My Favorite subject is PHP.
";
$sentence = trim(str_replace(["\r<br>", "\r", "<br>"], ' ', $sentence));
echo $sentence;
?>

My name is John Smith My Favorite subject is PHP.

Method 3: Using preg_replace() for All Whitespace

This method replaces any whitespace sequence (newlines, tabs, multiple spaces) with a single space ?

<?php
$sentence = "
My name is John Smith
My Favorite subject is PHP.
";
$sentence = trim(preg_replace('/\s+/', ' ', $sentence));
echo $sentence;
?>

My name is John Smith My Favorite subject is PHP.

Comparison

Conclusion

Use str_replace() for simple newline removal or preg_replace() when you need to handle multiple whitespace characters. Always use trim() to remove leading and trailing spaces.