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<?php $var = FALSE; var_dump($var); echo print_r(trim($var), TRUE); echo "\n"; echo $var; $var2 = trim($var); var_dump($var2) ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
bool(false) string(0) ""