How can we remove the white spaces from string in PHP?

There are three functions in PHP to remove the white spaces from the string.
trim()-It removes whitespaces from the left and right side of the string.
ltrim()-It removes whitespaces from the left side of the string.
rtrim()-It removes whitespaces from the right side of the string.

Example:

<?php
$string="  Interview  Question   and Answers for your help   ";
$var1=trim($string);
echo $var1;
$var2=ltrim($string);
echo $var2;
$var3=rtrim($string);
echo $var3;
?>

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