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<?php $str = ' Cent sign: '.pack('H*','c2a9'); echo "str is: $str"; echo "\n"; var_dump( $str ); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
str is: Cent sign: © string(14) " Cent sign: ©"