place a value

[guest]

ok i am trying to make it if "$_POST['url']" doesnt have "http://" in it to insert it before the text submited

ex if i submit www.google.com that code snipet puts "http://" in front of it and if i submit http://www.google.com to leave it alone

[planetsim]

You could probably do this many other ways but this is probably the best way as your not searching through the entire string but rather that first x characters

if (substr($string,0,7)=='http://')
{
  //leave alone
} 
else
{
  $string = "http://".$string;
}