You can remove all whitespace from a string in PHP using various methods. Here’s one way to do it using the `preg_replace()` function with a regular expression:
<?php
$string = " Hello World ";
// Remove all whitespace using regular expression
$cleanString = preg_replace('/\s+/', '', $string);
echo "Original String: '" . $string . "'<br>";
echo "Cleaned String: '" . $cleanString . "'";
?>
This code will output:
Original String: ' Hello World ' Cleaned String: 'HelloWorld'
Explanation:
1. `’/\s+/’`: This regular expression matches one or more whitespace characters (including spaces, tabs, and newlines).
2. `preg_replace(‘/\s+/’, ”, $string)`: This function replaces all occurrences of whitespace characters with an empty string, effectively removing them from the original string.
3. `$cleanString`: This variable holds the cleaned string without any whitespace.