How php removes specified characters from both sides of a string

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Php to remove the specified characters on both sides of the string: 1, use the trim () function, syntax "trim (string,' specified character')"; 2, use ltrim () and rtrim () function, syntax "rtrim (string,' left specified character'), 'right specified character')".

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Php removes the specified characters from both sides of the string

1. Use the trim () function

Example: remove commas from both sides of a string

The trim () function removes white space characters or other predefined characters from both sides of the string.

Syntax:

The trim (string,charlist) parameter is required to describe string. Specifies the string to check. Charlist is optional. Specifies which characters are removed from the string. If this parameter is omitted, all the following characters are removed:

"\ 0"-NULL

"\ t"-Tab character

"\ n"-Line break

"\ x0B"-Vertical Tab

"\ r"-enter

""-Spac

Return value: returns the modified string.

2. Use the ltrim () and rtrim () functions

Ltrim ()-removes white space characters or other predefined characters on the left side of the string.

Rtrim ()-removes white space characters or other predefined characters to the right of the string.

Example:

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