PHP Bugs: Property Problems (Proof 1)

php_bugs_6_1.php

<?php

$bird = new stdClass();
$bird->name = "Mockingbird";

$tail = new stdClass();
$tail->color = "Brown";
$tail->type  = null;

$bird->tail = $tail;

echo "isset:\n";
echo (int)isset($bird->tail) . "\n";
echo (int)isset($bird->tail->color) . "\n";
echo (int)isset($bird->wing) . "\n";
echo (int)isset($bird->tail->type) . "\n";
echo "\nproperty_exists:\n";
echo (int)property_exists($bird, 'tail') . "\n";
echo (int)property_exists($bird->tail, 'color') . "\n";
echo (int)property_exists($bird, 'wing') . "\n";
echo (int)property_exists($bird->tail, 'type') . "\n";

// Output:
// isset:
// 1
// 1
// 0
// 0

// property_exists:
// 1
// 1
// 0
// 1