Description:
------------
Neither is_numeric() nor intval() recognize '0b...' strings. 

Test script:
---------------
Code:
$as = array("0x10", "16", "020", "0b10000");
foreach($as as $v) {
	echo "The function is_numeric('" . $v . "') returns ";
	if (is_numeric($v)) { echo("true"); } else { echo("false"); };
	echo ".<br>";
}

Output:
The function is_numeric('0x10') returns true.
The function is_numeric('16') returns true.
The function is_numeric('020') returns true.
The function is_numeric('0b10000') returns false.

Code:
$as = array(["0x10", 16], ["16", 10], ["020", 8], ["0b10000", 2]);
foreach($as as $v) {
	echo "The function intval('" . $v[0] . "', " . $v[1] . ") returns " . intval($v[0], $v[1]) . ".<br>";
		}
Output:
The function intval('0x10', 16) returns 16.
The function intval('16', 10) returns 16.
The function intval('020', 8) returns 16.
The function intval('0b10000', 2) returns 0.