strip

Replaces all spaces, newlines and tabs with a single space, or with the supplied string.

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Note:- If you want to strip blocks of template text, use the built-in {strip} function.

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Parameter Position	Type	Required	Default	Description
1	string	No	one space	This value is replace when srtiping space, new line and tabs.

Template:

{$articleTitle = "Grandmother of\neight makes\t    hole in one."}

{$articleTitle}

{$articleTitle|strip}

{$articleTitle|strip:' '}

output:

Grandmother of
eight makes        hole in one.

Grandmother of eight makes hole in one.

Grandmother of eight makes hole in one.

see also strip in PHP Smarty documentation.