How to trim charachter DEL(ASCII code 127) in PHP

Question

I trim post value after form submitted, like this:

$value=trim($_POST['submit_value']);

So if I submit ' some_value ', then it will become 'some_value'

PHP trim() works fine so far.

But recently, there is an DEL(ASCII code 127) character submitted and I don't know how to trim it.

$asd=DEL(ASCII code 127) character;
    // I cannot copy, because stackoverflow remove it.
    // it looks like space but it's not. trim() doesn't work. 

echo ord($asd); //return 127

any ideas? many thanks!

btw, here is a way to type this character:

Unicode Character 'DELETE' (U+007F)

How to type in Microsoft Windows

I don't know under what condition will a user need to type this character when register his name

it's the code 127 DEL in [ASCii table](http://www.ascii-code.com/) — Autodesk, Aug 01 '17 at 08:16

score 0 · Answer 1 · answered Aug 01 '17 at 08:03

0

I assume you need only alphanumeric data in this field. than you can do some thing like below code.

trim(preg_replace('/[^da-z0-9A-Z]/i', '', $_POST['submit_value']));

answered Aug 01 '17 at 08:03

vijaybir singh

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thank you,but it works only on English,not on other languages – Autodesk Aug 01 '17 at 08:26

score 0 · Accepted Answer · answered Sep 10 '17 at 14:59

$string = preg_replace('/[\x00-\x1F\x7F-\xFF]/', '', $string);

It matches anything in range 0-31, 127-255 and removes it.

The answer is from: PHP: How to remove all non printable characters in a string?

BTW, one may replace multiple spaces with a single space:

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

php Replacing multiple spaces with a single space

How to trim charachter DEL(ASCII code 127) in PHP

2 Answers2