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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[2]) );

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