Question

I m writing in PHP!

There s a user string input, and I want to cut off all newlines,1 chars that are more than 1 in a row (avoid <br /><br />...).

example:

I am a




SPaMmEr!

would become:

I am a
SPaMmEr!

or

I am a
.
.
.
.
SPaMmEr!

likewise

Answer 1

Getting all lines is done this way (if you want to catch dos, mac and unix line feeds):

$lines = explode("
", str_replace(array("
", "
"), "
", $string));

Filtering lines with more than one character can be done with preg_grep():

$lines = preg_grep( /^.{2}/ , $lines);

Or using regular expressions for the complete process:

preg_match_all( /^.{2}.*$/ , $string, $matches);
$lines = $matches[0];

Or if you don t need an array containing all remaining lines, you can remove the unwanted strings with a single call:

$string = preg_replace( /^.?$
/m ,   , $string);

Answer 2

How about this:

$str = str_replace(array("
", "
"),   , $str);

Where $str is your user input.

EDIT:

Sorry, this code will remove all lines regardless, still might come in handy.

Answer 3

is a valid input for a newline, as well as and . Run a Regex or str_replace to replace all combinations of and with and you can use use explode(" ", $string), and check all items of the array for one char or empty one. You can remove those, or replace it by a single instance of the repeated char, e.g. I use a single newline for a new paragraph, so it would destroy such.

Answer 4

Why not use regexp for this:

## replace 1 or more new line symbols with single new line symbol
$empty_lines_trimmed = preg_replace( "(
?
)+" , "
", $empty_lines);

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