Understanding PHP Type Coercion

Question

I saw this small piece of code that is evading my understanding:

Answer 1

PHP attempts to convert to type float because the string begins with a 0. It stops after 0 because the next character is not a number. The same thing happens when you use type coercion to convert scientific notation to integer:

$x = (float)"12E-1x";  // $x == 1.2
$x = (int)"12E-1x";  // $x == 12 (stops at E because it's not an integer)