--TEST--
Bug #31098 (isset() / empty() incorrectly returns true in dereference of a wrong type)
--FILE--
<?php
$a = '';
var_dump(isset($a->b));
$a = 'a';
var_dump(isset($a->b));
$a = '0';
var_dump(isset($a->b));
$a = '';
var_dump(isset($a['b']));
$a = 'a';
var_dump(isset($a['b']));
$a = '0';
var_dump(isset($a['b']));

$simpleString = "Bogus String Text";
echo isset($simpleString->wrong)?"bug\n":"ok\n";
try {
    echo isset($simpleString["wrong"])?"bug\n":"ok\n";
} catch (\TypeError $e) {
    echo $e->getMessage() . \PHP_EOL;
}
echo isset($simpleString[-20])?"bug\n":"ok\n";
echo isset($simpleString[0])?"ok\n":"bug\n";
echo isset($simpleString["0"])?"ok\n":"bug\n";
echo isset($simpleString["16"])?"ok\n":"bug\n";
echo isset($simpleString["17"])?"bug\n":"ok\n";
echo $simpleString->wrong === null?"ok\n":"bug\n";
try {
    echo $simpleString["wrong"] === "B"?"ok\n":"bug\n";
} catch (\TypeError $e) {
    echo $e->getMessage() . \PHP_EOL;
}
echo $simpleString["0"] === "B"?"ok\n":"bug\n";
try {
    $simpleString["wrong"] = "f";
} catch (\TypeError $e) {
    echo $e->getMessage() . \PHP_EOL;
}
echo $simpleString["0"] === "f"?"ok\n":"bug\n";
?>
--EXPECTF--
bool(false)
bool(false)
bool(false)
bool(false)
bool(false)
bool(false)
ok
ok
ok
ok
ok
ok
ok

Warning: Attempt to read property "wrong" on string in %s on line %d
ok
Cannot access offset of type string on string
ok
Cannot access offset of type string on string
ok