php Replacing multiple spaces with a single space

问题:

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.

回答1:

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.

回答2:

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

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

回答3:

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