$text = " sample text \r\n"; echo trim($text); // 'sample text'
When handling user input, it may be necessary to clean the input data. Part of this process involves removing invisible characters from the beginning and end of the text, which may be accidental or intentional. For example, a user may type only a few space characters in place of a required field.
In PHP, you can do this cleanup using the
trim function, like this:
trim(' username\r\n'); // 'username'
By default, the trim function removes all normal space
characters from the beginning and end of the text. Besides this, it also removes the following whitespace characters:
- "\t" - tab.
- "\n" - new line
- "\r" - carriage return
- "\0" - the
- "\v" - vertical tab.
It's good to know that you can specify a list of characters as the second parameter of the
trim function, and the function will remove these characters as well.
echo trim('apple','ae'); // ppl
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