Best way to remove this string from another string?

[Jakez]

I'm trying to find the simplest (no big function) solution to this, probably could do some kind of regex, but I'm a regex noob.

 

Ok let's say I have a string of ID's like:

 

$string="1,2,3,4,5,6,7,8,9,89,87,83";

 

Then I want to remove ID 8. So I do this:

 

$string=str_replace(",8","",$string);

 

Simple enough right? BUT it's going to remove the ,8 from ID's 89 and 87 also! And if it's at the beginning or end of the string I think that could pose another problem as well..

[premiso]

$string=str_replace(",8,", ",", $string);

 

Should do the trick.

[Jakez]

$string=str_replace(",8,", ",", $string);

 

Should do the trick.

 

Ah I forgot to give that example, yeah that's was one of the solutions I thought of, but if the ID is at the beginning or end then it's not going to work:

 

$string="1,2,3,4,5,6,7,8";

 

I seem to run into this type of string replace problem quite often, surely there's got to be some PHP function I don't know about that deals with exactly this.

[premiso]

There is by using regular expressions:

 

preg_replace I am just too lazy right now to figure out the regex needed.

[Jakez]

Found a solution, although I'm sure there's a regex that could do this in one line

 

$string = ",8,1,2,3,4,5,6,7,8,9,89,87,83,8";

$patterns = array();

$patterns[0] = '/(,8,)/';

$patterns[1] = '/(,$/';

$replacements = array();

$replacements[1] = ',';

$replacements[0] = '';

echo preg_replace($patterns, $replacements, $string);

 

[kenrbnsn]

Here's a solution using a function:

<?php
function remove_value($str,$val) {
$ary = explode(',',$str);
$keys = array_keys($ary,$val);
if ($keys !== false) {
	foreach ($keys as $k) {
		unset($ary[$k]);
	}
}
return (implode(',',$ary));
}
$str = ",8,1,2,3,4,5,6,7,8,9,89,87,83,8";
echo remove_value($str,'8');
?>

 

Ken