Description:
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The $description argument of assert() is not binary-safe.
When the description is displayed, it will get truncated at the first null (\0) byte.

Test script:
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<?php

// run with: php -d zend.assertions=1 -f /tmp/test.php

error_reporting(E_ALL);
ini_set("display_errors", 1);
assert_options(ASSERT_ACTIVE, true);
assert_options(ASSERT_WARNING, true);

assert(false, "foo\000bar");

Expected result:
----------------
Warning: assert(): foobar failed in /tmp/test.php on line 10

Actual result:
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Warning: assert(): foo failed in /tmp/test.php on line 10