Description:
------------
Type casting a value on an if doesn't work!

If i compare a string value with the same value type casted to an int and this string doesn't contains a numeric value i recive a true from the boolean expression!

I've tried many combinations but all return the same result

Thanks for the help

Reproduce code:
---------------
<?php

$valore = 'qwerty';

if ($valore == (int)$valore)
{
    echo "variable contains a valid numeric value!";
}
else
{
    echo "variable doesn't contains a valid numeric value!";
}

?>

Expected result:
----------------
$valore == (int)$valore  --> FALSE

variable doesn't contains a valid numeric value!

Actual result:
--------------
$valore == (int)$valore  --> TRUE

variable contains a valid numeric value!