function trim () for PHP to remove whitespace characters or other predefined characters on either side of a string

Instance

Remove the character to the left of the string ("He" in "Hello" and "d!" in "World") ）：

<?php$str = "Hello world!"; Echo $str. "<br>"; echo Trim ($str, "hed!"); >

Definition and usage

The trim () function removes white space characters or other predefined characters on either side of the string.

Related functions:

• LTrim ()-removes white space characters or other predefined characters to the left of the string.

• RTrim ()-Removes the white space character or other predefined character to the right of the string.

Grammar

Trim (string,charlist)

parameters	description
string	required. Specifies the string to check.
charlist	optional. Specifies which characters are removed from the string. If this argument is omitted, all of the following characters are removed: " \ "-NULL "\ T"-Tabs "\ n"-line break "\x0b"-vertical tab "\ r"-Enter ""-Space

Technical details

return value:	Returns the modified string.
PHP version:	4 +
Update log:	In PHP 4.1, the charlist parameter has been added.

More examples

Example 1

To remove spaces on either side of a 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 (see source code):

<! DOCTYPE html>
The browser output of the above code is as follows:

Without Trim:hello world! With Trim:hello world!
Example 2

Remove 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 (see source code):

<! DOCTYPE html>
The browser output of the above code is as follows:

Without Trim:hello world! With Trim:hello world!
Example

<?php $str = "# #使用函数trim去掉字符串两端特定字符 # # #; $str 1 = Trim ($str, "#"); When you pass in the second parameter for function trim, Trim removes the # character Echo $str at both ends of the string $str. " <br> "; echo $str 1;?>
Output:

# #使用PHP函数trim () remove specific characters at both ends of a string # # # # Use function trim to remove specific characters at both ends