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How to use php trim function

藏色散人Original: 2019-05-29 11:35:522846browse

php trim function is used to remove blank characters or other predefined characters on both sides of a string. Its syntax is trim(string,charlist), and the parameter string is required. Specifies the string to check.

#How to use the php trim function?

Definition and usage

#trim() function removes whitespace characters or other predefined characters on both sides of a string.

Related functions:

ltrim() - Removes whitespace characters or other predefined characters on the left side of a string.

rtrim() - Removes whitespace characters or other predefined characters on the right side of a string.

Syntax

trim(string,charlist)

Parameters

string Required. Specifies the string to check.

charlist Optional. Specifies which characters are removed from a string.

If this parameter is omitted, all the following characters are removed:

"\0" - NULL

"\t" - Tab character

"\n" - line feed

"\x0B" - vertical tab character

"\r" - carriage return

" " - space

Return value: Returns the modified string.

PHP version: 4

Change log:

In PHP 4.1, the charlist parameter is added.

Example 1

Remove spaces on both sides of the string:

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

The HTML output of the above code is as follows (view source code):

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

The browser output of the above code is as follows:

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

Example 2

Remove the newline characters (\n) on both sides of the string:

<?php
$str = "nnnHello World!nnn";
echo "Without trim: " . $str;
echo "<br>";
echo "With trim: " . trim($str);
?>

The HTML output of the above code is as follows (view source code):

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

The browser output of the above code is as follows:

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

Example 3

Remove characters on the left side of the string ("He" in "Hello" and "d!" in "World"):

<?php
$str = "Hello World!";
echo $str . "<br>";
echo trim($str,"Hed!");
?>

Output:

Hello World!
llo Worl

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