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<?php $test = 'call_user_func_array' echo ${test}('strtoupper', ('test'));
Output for 5.5.24 - 5.5.30, 5.6.8 - 5.6.15
Parse error: syntax error, unexpected 'echo' (T_ECHO) in /in/iIVpY on line 3
Process exited with code 255.
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