string has prefix PHP

Question

Possible Duplicate:
PHP startsWith() and endsWith() functions
Check if variable starts with ‘http’

How make an if-statement that if $mystring has the prefix "http://" then {do something}.

I've done this in objective-c like this:

if([mynsstring hasPrefix:@"http://"])
{
//Do something...
}

I don't know how to do this in PHP. Thanks for your help in advance.

Answer 1

Simplest would be using substring to compare

if (substr($mystring, 0, 7) === 'http://') {
     // do something
}

Remember of course to take the exact number of characters.