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<?php $a = sprintf('%.1f', round(-5, 1)); var_dump($a); var_dump(sprintf('%.1f', round(abs($a), 1))); ?>
based on s4eXC
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0rc2
string(4) "-5.0" string(3) "5.0"