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PHP trim() Function

PHP String Reference Complete PHP String Reference

Definition and Usage

The trim() function removes whitespaces and other predefined characters from both sides of a string.

Syntax

trim(string,charlist)

Parameter Description
string Required. Specifies the string to check
charlist Optional. Specifies which characters to remove from the string. If omitted, all of the following characters are removed:
  • "\0" - NULL
  • "\t" - tab
  • "\n" - new line
  • "\x0B" - vertical tab
  • "\r" - carriage return
  • " " - ordinary white space

Example 1

<html>
<body>
<?php
$str = " Hello World! ";
echo "Without trim: " . $str;
echo "<br />";
echo "With trim: " . trim($str);
?>
<body>
<html>

The browser output of the code above will be:

Without trim: Hello World!
With trim: Hello World!

If you select "View source" in the browser window, you will see the following HTML:

<html>
<body>
Without trim:    Hello World!   <br />
With trim: Hello World!
</body>
</html>

Example 2

<?php
$str = "\r\nHello World!\r\n";
echo "Without trim: " . $str;
echo "<br />";
echo "With trim: " . trim($str);
?>

The browser output of the code above will be:

Without trim: Hello World!
With trim: Hello World!

If you select "View source" in the browser window, you will see the following HTML:

<html>
<body>
Without trim:
Hello World!
<br />With trim: Hello World!
</body>
</html>

PHP String Reference Complete PHP String Reference
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