PHP trim() function: Remove characters from string
In this tutorial, we look at the PHP trim function. We look at how you can remove whitespaces and characters from a string using the trim function in PHP.
Table of Contents - PHP Trim:
- What does trim do?
- Code and Explanation
- Closing thoughts
What does the PHP trim() function do?
trim() function in PHP removes whitespace or any other predefined character from both the left and right sides of a string.
rtrim() are used to remove these whitespaces or other characters from the left and right sides of the string. However, making use of just the
trim() function without specifying
‘r’ removes characters from both sides.
Code & Explanation:
In this section, we look at the various syntax, parameters, and return values used in the
trim() function. Post that we look at a code snippet using the
- $string - Required. This is the string or the variable containing the string from which you want to remove whitespaces or characters.
- $charlist - Optional. This parameter specifies the character that needs to be removed from the string. If left empty, all the characters mentioned below would be removed.
“\x0B”– vertical tab
“\r”– carriage return
” ”– ordinary white space
A modified string with whitespaces or the specified characters removed from both sides is returned.
Code using PHP Trim:
<?php // PHP program using trim() $str = " Hire freelance developer "; // Since a second parameter was not passed // leading and trailing whitespaces are removed echo trim($str); ?>
The output for the above code snippet would be as follows:
Hire freelance developer
Now let’s look at a case where we pass a second argument.
<?php // removing the predefined character $str = "Hire freelance developer"; echo trim($str, "Hir"); ?>
The output for this code snippet would be the following:
e freelance develope
As you can see the “hir” from “Hire” and the “r” from “developer” were removed.
Closing thoughts - PHP trim():
There are no caveats as such while using the PHP trim() function. I would recommend practicing the
trim() method as it can get tricky at times. Also, try using the
rtrim() both these functions have very specific use cases.