In PHP, ltrim and rtrim are used to remove left and right spaces and special characters.

This article mainly introduces the use of ltrim and rtrim in PHP to remove left and right spaces and special characters. The definition of ltrim and rtrim is described in detail in the form of examples, the function of parameters and tips for removing left and right spaces and special characters. For more information about how to use ltrim and rtrim to remove left and right spaces and special characters in PHP, see the examples in this article. We will share this with you for your reference. The details are as follows:

I. Definitions of ltrim in PHP are as follows:

Ltrim (string, charlist)

Parameter description:

String is required. Specifies the string to be checked.

Charlist
Optional. Specifies which characters are deleted from the string. If this parameter is omitted, all the following characters are removed:
"\ 0"-NULL
"\ T"-tab
"\ N"-line feed
"\ X0B"-vertical tab
"\ R"-Press enter
""-Space

2. rtrim in PHP is defined as follows:

Rtrim (string, charlist)

Parameters are described as follows:

String is required. Specifies the string to be checked.

Charlist
Optional. Specifies which characters are deleted from the string. If omitted, all the following characters are removed:
"\ 0"-NULL
"\ T"-tab
"\ N"-line feed
"\ X0B"-vertical tab
"\ R"-Press enter
""-Space

III. Usage example:

<? Php $ str = "(: @ _ @ provides a large number of excellent scripts and materials for readers to download \ n @ _ @:)"; echo ltrim ($ str); echo"
"; Echo ltrim ($ str," (: @ _ @ "); echo"
"; Echo rtrim ($ str); echo"
"; Echo rtrim ($ str," @ _ @:) ");?>

The running result is as follows:

(: @ _ @ 文 provides a large number of excellent scripts and materials for readers to download. @ _ @:) 文 provides a large number of excellent scripts and materials for readers to download @_@:)(: @ _ @ script home provides a large number of excellent scripts and materials for readers to download @ _ @:) (: @ _ @ script home provides a large number of excellent scripts and materials for readers to download

I hope this article will help you with PHP programming.