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<?php $a = array(); $a["foo"] = "bar"; $a["baz"] = "quux"; $a["100"] = "zimbabwe"; echo "\$a is an associative map with some things in it: "; var_export($a); echo "\n\n"; $keys = array_keys($a); echo "It has these keys: "; var_export($keys); echo "\n\n"; echo "But there was a silent string-int coercion when we added an object to the container using a string key that looked like an int\n\n"; var_dump( is_string($keys[0]) );
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
$a is an associative map with some things in it: array ( 'foo' => 'bar', 'baz' => 'quux', 100 => 'zimbabwe', ) It has these keys: array ( 0 => 'foo', 1 => 'baz', 2 => 100, ) But there was a silent string-int coercion when we added an object to the container using a string key that looked like an int bool(true)