php Replacing multiple spaces with a single space [duplicate]

This question already has answers here: 开发者_JAVA百科 How can I convert ereg expressions to preg in PHP? (4 answers) Closed 3 years ago.

I'm trying to replace multiple spaces with a single space. When I use ereg_replace, I get an error about it being deprecated.

ereg_replace("[ \t\n\r]+", " ", $string);

Is there an identical replacement for it. I need to replace multiple " " white spaces and multiple nbsp white spaces with a single white space.

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Use preg_replace() and instead of [ \t\n\r] use \s:

$output = preg_replace('!\s+!', ' ', $input);

From Regular Expression Basic Syntax Reference:

\d, \w and \s

Shorthand character classes matching digits, word characters (letters, digits, and underscores), and whitespace (spaces, tabs, and line breaks). Can be used inside and outside character classes.

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$output = preg_replace('/\s+/', ' ',$input);

\s is shorthand for [ \t\n\r]. Multiple spaces will be replaced with single space.

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preg_replace("/[[:blank:]]+/"," ",$input)