Checking string for multiple values

[ziycon]

I have a string passed in and I want to check validate it to make sure that multiple values don't exist at the start, the below would only check the entire string for the value??

if(strstr($string,array("value1","value2","value3")) {
  ...
}

[code green]

What do you mean by 'start'?

[ziycon]

Say a link is entered like bytes.com I want to check it to see if it has www. before it and if not to add it or another example would be say http://www.bytes.com was entered I want to check and remove the http://.

I'm looking to validate the input so only www.bytes.com is kept.

Does this make sense?

[Dormilich]

it does. it also makes sense to use Regular Expressions for that.

[Atli]

Hey.

You could use the substr function to fetch parts of the string and see if they are, or are not, what you expect them to be.

Like, to remove http:// from the start of a string:

if(substr($input, 0, 7) == 'http://') {
    $input = substr($input, 7);
}

Or, as Dormilich suggested, you could use a regular expression. It's a lot more complex, and may be overkill if this is as simple as removing http:// from URLS, but may be better if you are doing something more complex.

For example, this could be used with the preg_match function to split an URL into individual parts, which can then be verified and assembled into the format you want.

$regexp = '#(https?://)?(([^\.]+\.)+)?([^\.]+)\.([^/]{2,4})#i';

But, like I say, this is a bit more complex, so it may be a bit much for simple tasks that substr can take care of.