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<?php class Foo { public function __toString() { return 'string_representation'; } } mb_check_encoding(new Foo, 'UTF-8');
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.24 - 7.2.33, 7.3.11 - 7.3.33, 7.4.0 - 7.4.26, 8.0.0 - 8.0.13, 8.1rc1 - rc3
Output for 7.2.0 - 7.2.23, 7.3.0 - 7.3.10
Warning: mb_check_encoding(): Input is something other than scalar or array in /in/tRJm3 on line 11
Output for 5.1.3 - 5.1.6
Warning: mb_check_encoding() expects parameter 1 to be string, object given in /in/tRJm3 on line 11
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.2
Fatal error: Call to undefined function mb_check_encoding() in /in/tRJm3 on line 11
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/tRJm3 on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/tRJm3 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/tRJm3 on line 5
Process exited with code 255.

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