PHP Trim Function Tutorial

Trim Function

Syntax:
trim(string,charlist)

The trim() function takes two parameters.
The trim() function strips whitespaces or other characters from the both sides i.e. beginning and end of a string.
If the second argument, charlist is not specified, trim() function strips all whitespace (" "), new line "\n", tab ("\t"), carriage return ("\r") by default. 

Example: 1

        <?php
       $str = '&nbsp;This is a test.&nbsp;';
       $str_trimed = trim($str);
       echo $str_trimed;
       echo $str;
        ?>

Output

 This is a test.  This is a test. 

Example: 2

       <?php
       $str = '?My workload is increasing. I am learning to prioritize.?';
       $str_trimed = trim($str, "?");
       echo $str;
       echo "<br>";
       echo $str_trimed;
       ?>

Output

?My workload is increasing. I am learning to prioritize.?
My workload is increasing. I am learning to prioritize.

Notice that '?' is trimmed both sides from string.