in_array() is acting very strange; here is the script I am using:

<?
$a = array('1.10','1.12.4.3','1.13.4.2');
var_dump($a);
if (in_array('1.1',$a)) echo '1.1 found without strict check';
if (in_array('1.1',$a, true)) echo '1.1 found with strict check';
?>

Output:

array(3) {
  [0]=>
  string(4) "1.10"
  [1]=>
  string(8) "1.12.4.3"
  [2]=>
  string(8) "1.13.4.2"
}
1.1 found without strict check

Now, '1.1' should never be found at all, since its not in the input string array, but it is found!

However, looking at the source code reveals an undocumented 'strict' argument, which when set to true, works correctly.

Two issues:

a) Could this extra parameter please be documented?

b) Why on earth does it match them as identical when it's not 'strict'?  Do they revert to being evaluated in an integer context (the only way I can think off that 1.10 and 1.1 would be equivalent)