<?php

// Incorrect call. Ignore.
assert();

// OK in all versions.
assert(false);
assert(true);

// Undetermined. Ignore.
assert($assertion);

// Expression, PHP 7+, not our concern.
assert(true == false);
assert((bool) ($input));

// Deprecated as of PHP 7.2.
assert('mysql_query("")');
assert("2 < 1" /* just a demo */, 'Two is less than one');
assert(<<<'EOT'
    is_string($result) &&
    (strlen($result) > 0);
EOT
);
assert(
    'is_int($int)'
    . '&& $int > 10'
);