[RESOLVED] how to check for allowed chars and if not allowed - delete chars

[wtg21_org]

$allowed = array("1", "2","3","4","5","6","7","8","9","0")

$info = array (
"354624375427257",
"43545fdg45435435",
432546265265,,",
.....
"35454365243643245",
);

now i need array $info to check if there are only allowed chars and if there are other chars just delete them...

thanks

[laserlight]

Could you use regular expression instead? If so [man]preg_replace/man would do the job.

[wtg21_org]

i dont think so

i just know allowed characters but ... what i dont know is other characters that might be written in tat textarea ...

[bretticus]

it is very simple to negate a regular expression:

<?php 
$text = "now is the time for <all> men to come to the aid of their country.*$%$#!";

echo preg_replace("/[^a-z0-9\.\? ]/i", "", $text);

// renders: now is the time for all men to come to the aid of their country.
?>

[laserlight]

wtg21.org wrote:

i dont think so

Are you sure? If you can it could simplify things.

wtg21.org wrote:

i just know allowed characters but ... what i dont know is other characters that might be written in tat textarea ...

That is okay, since we can replace everything that is not among the allowed characters with an empty string. For example:

<?php

$info = array (
    '354624375427257',
    '43545fdg45435435',
    '432546265265,,',
    '35454365243643245');

$allowed = array("1", "2", "3", "4", "5", "6", "7", "8", "9", "0");

$disallowed_pattern = '/[^' . preg_quote(implode('', $allowed)) . ']/';
$info = preg_replace($disallowed_pattern, '', $info);

print_r($info);

[nrg_alpha]

bretticus;10898597 wrote:

it is very simple to negate a regular expression:

<?php 
$text = "now is the time for <all> men to come to the aid of their country.*$%$#!";

echo preg_replace("/[^a-z0-9\.\? ]/i", "", $text);

// renders: now is the time for all men to come to the aid of their country.
?>

Hey Brett.. just to let you know, in this case you, you don't need to escape the dot or the question mark, as most meta characters (besides characters like ^, or - [depending on their location]) within a character class are automatically stripped of their special meaning and translated as literals.

echo preg_replace("/[^a-z0-9.? ]/i", "", $text);

[wtg21_org]

laserlight - thank you ... in fact THANK ALL OF YOU!!!

I LOVE phpbuilder.com

[laserlight]

You're welcome, though I hope that you come to understand my example and adapt it to your own code.
Remember to mark this thread as resolved using the thread tools.

[bradgrafelman]

Don't forget to mark this thread resolved (using the option under Thread Tools).

Note that if by "allowed chars" you simply mean "numbers", laserlight's code can be condensed (as hinted above) to:

$info = preg_replace('/[^0-9]/', '', $info);

[wtg21_org]

laserlight;10898628 wrote:

You're welcome, though I hope that you come to understand my example and adapt it to your own code.
Remember to mark this thread as resolved using the thread tools.

I ALLREADY ADAPTED IT and modified it for my own needs ... thanks again