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Checking string for multiple values

384 Contributor
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??
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  1. if(strstr($string,array("value1","value2","value3")) {
  2.   ...
  3. }
Dec 30 '09 #1
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1,726 Recognized Expert Top Contributor
What do you mean by 'start'?
Dec 30 '09 #2
384 Contributor
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?
Dec 30 '09 #3
8,658 Recognized Expert Moderator Expert
it does. it also makes sense to use Regular Expressions for that.
Dec 30 '09 #4
5,058 Recognized Expert Expert

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:
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  1. if(substr($input, 0, 7) == 'http://') {
  2.     $input = substr($input, 7);
  3. }
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.
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  1. $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.
Dec 30 '09 #5

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