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I know this comment PHP.net. I would like to have a similar tool like tr for PHP such that I can run simply
tr -d " " "" I run unsuccessfully the function php_strip_whitespace by
$tags_trimmed = php_strip_whitespace($tags); I run the regex function also unsuccessfully
$tags_trimmed = preg_replace(" ", "", $tags); 
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strip(): The strip() method is the most commonly accepted method to remove whitespaces in Python. It is a Python built-in function that trims a string by removing all leading and trailing whitespaces.
The trim() function in PHP removes whitespace or any other predefined character from both the left and right sides of a string. ltrim() and rtrim() are used to remove these whitespaces or other characters from the left and right sides of the string.
trim() method removes the leading and trailing spaces present in the string. strip method removes the leading and trailing spaces present in the string. Also, it is Uniset/Unicode character aware.
The trim() method removes whitespace from both ends of a string and returns a new string, without modifying the original string. Whitespace in this context is all the whitespace characters (space, tab, no-break space, etc.) and all the line terminator characters (LF, CR, etc.).
To strip any whitespace, you can use a regular expression
$str=preg_replace('/\s+/', '', $str); See also this answer for something which can handle whitespace in UTF-8 strings.
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