remove characters from one string to another php

Question

I have this string with special characters only

 $chars="¢£¤¥¦§¨©ª«¬®¯°±²³´µ¶¸¹º»¼½¾ÀÂÃÄÅÆÈÊËÌÎÏÐÒÔÕÖ×ØÙÛÜÝÞßàâãäåæçèêëìî";

I have this another string with normal text with some of the special characters listed on the '$chars'occurrences.

   $string=" this is a normal text Â with some special ° characters I Þ  want to remove, not replace ê £";

How do I find the ocurrences and remove the chars listed on $chars and remove them from $string?

I was thinking using str_replace() with arrays but it is too much, I would need to make an array from $chars

Here there is the white list

abcdefghijklmnñopqrstuvwxyzñáéíóúABCDEFGHIJKLMNÑOPQRSTUVWXYZÁÉÍÓÚ0123456789[]=+-¿?¡!<>$%^&*'"()/#@*,.:;_|

Couldn't you just turn the logic upside down? Instead of black-listing, you should try to white-list the good chars. A simple regex for anything outside the white-listed chars would be trivial to do. — aefxx, Aug 07 '18 at 21:31
too late I have gathered thousands of them...Is there a way to make that work? — Dan, Aug 07 '18 at 21:36
This one would be my white list. `abcdefghijklmnñopqrstuvwxyzñáéíóúABCDEFGHIJKLMNÑOPQRSTUVWXYZÁÉÍÓÚ0123456789[]=+-¿?¡!<>$%^&*'"()/#@*,./:;_|` — Dan, Aug 07 '18 at 21:42
Sure, there is a way. Throw away those thousands and do it right! Black-listing is by it's very nature a limited beast, at best. — aefxx, Aug 07 '18 at 21:42
wondering if you've tried: preg_replace('/[^{insert white list here}]/', '', $string); ALSO, you could use preg_replace('/[^{same list all lower case}]/i', '', $string); where the "i" modifier allows it to ignore upper/lower case. (oh, and you'd have to quote the square brackets in the white list) — UncaAlby, Aug 07 '18 at 22:12
@UncaAlby could you give it a try please?, The white list is displayed above — Dan, Aug 07 '18 at 22:14
Some of those characters wreak havoc with my PHP 5.6 interpreter. You may need to use their octal codes. I mean, jeez, I get division by zero errors! — UncaAlby, Aug 07 '18 at 22:26

aefxx · Answer 1 · 2018-08-07T22:08:20.697

0

Regarding the OP's comment:

$regex = '[^\w\s\[\]\=\+\-\¿\?\¡\!\<\>\$\%\^\&\*\'\"\(\)\/\#\@\*\,\.\/\:\;\_\|]';
mb_ereg_replace($regex, '', $string);

edited Aug 07 '18 at 22:08

answered Aug 07 '18 at 21:52

aefxx

1

It retrieves ��ª�� – Dan Aug 07 '18 at 22:00
What was in `$string` that gave you this outcome? – aefxx Aug 07 '18 at 22:02
`$string="//abcdefghijklmnñopqrstuvwxyzñáéíóúABCDEFGHIJKLMNÑOPQRSTUVWXYZÁÉÍÓÚ0123456789[]=+-¿?¡!<>$%^&*'()/#@*,.:;_| |||||||||| ] ¢£¤¥¦§¨©ª«¬®¯°±²³´µ¶¸¹º»¼½ mmmmm onload onclick='' [ ? / < ~ # ` ! @ $ % ^ & * ( ) + = } | : ; ' , > { space !#$%&'()*+,-./:;<=>?@[\]^_`{|}~ sdsd ** *`` `` ´´ {} {}[] ````... ;;,,´'¡'!!!!¿?ña ñaña ÑA á é´´ è ´ 8i ó ú à à` à è`ì`ò ù & > < ksks < wksdsd '' \" \' "; ` – Dan Aug 07 '18 at 22:03
Updated the answer but keep in mind that `\w` in the regex might not suite your needs. You would need to replace it with the exact characters you wish to white-space if you need strict control. – aefxx Aug 07 '18 at 22:09
Sry, my test say otherwise, please double check. – aefxx Aug 07 '18 at 22:18

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