PHP Replacing Multiple Spaces With a Single Space

php Replacing multiple spaces with a single space

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.

replace multiple spaces in a string with a single space

Your regex replaces any number of spaces (including zero) with a space. You should only replace two or more (after all, replacing a single space with itself is pointless):

$s = preg_replace("/ {2,}/", " ", $x);

How to correctly replace multiple white spaces with a single white space in PHP?

When passing u modifier, \s becomes Unicode-aware. So, a simple solution is to use

$new_str = preg_replace("/\s+/u", " ", $str);
                             ^^

See the PHP online demo.

How to replace multiple   and whitespace with one   and shrink whitespace only chunks to a space?

You may use

$find = ['/^((?: |\s)+)|(?1)$/', '/\s* (?:\s* )*\s*/', '/\s+/'];
$replace = ['', ' ',' '];
$text = preg_replace($find, $replace, trim($text));

See the PHP demo.

Details

• '/^((?: |\s)+)|(?1)$/' => '' removes   and whitespaces at the start/end of string ((?1) here just recurses (?: |\s)+ and is here to make the pattern a bit shorter)
• '/\s* (?:\s* )*\s*/' => ' ' replaces all sequences of whitespace and   with at least one   with one  
• '/\s+/' => ' ' replaces 1+ whitespaces with 1 regular space.

Php replace multiple spaces with single spaces

Using preg_replace()

$name = preg_replace('#\s+#', ' ', $rawName);

php replace multiple spaces with a single space

Try this one. It will display as a single space on browser

$output = str_replace(" ", " ",$input);

replacing spaces with just one _

Probably the cleanest and most readable solution:

preg_replace('/[[:space:]]+/', '_', $name);

This will replace all spaces (no matter how many) with a single underscore.

Replace Multiple Spaces and Newlines with only one space in PHP

I would encourage you to use preg_replace:

# string(45) "This is a dummy text . I need to format this."
$str = preg_replace( "/\s+/", " ", $str );

Demo: http://codepad.org/no6zs3oo

You may have noted in the " . " portion of the first example. Spaces that are immediately followed by punctuation should probably be removed entirely. A quick modification permits this:

$patterns = array("/\s+/", "/\s([?.!])/");
$replacer = array(" ","$1");

# string(44) "This is a dummy text. I need to format this."
$str = preg_replace( $patterns, $replacer, $str );

Demo: http://codepad.org/ZTX0CAGD

replace multiple spaces by non breaking spaces

It seems all you need is to replace each whitespace that is preceded with another whitespace symbol. Use a lookbehind-based approach:

(?<=\s)\s

See the regex demo.

The (?<=\s) is a positive lookbehind that requires the presence of a whitespace immediately before the current location, but the whitespace is not consumed, and is thus not replaced.

Below is a PHP demo:

$s = "This is     my text.";
echo preg_replace('~(?<=\s)\s~', ' ', $s);
// => This is     my text.

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