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<?php $mbstringFunctions = array( 'mb_check_encoding', 'mb_convert_encoding', 'mb_substitute_char', ); do { foreach ( $mbstringFunctions as $func ) { if ( !function_exists( $func ) ) { break 2; } } return 1; } while ( false ); return 0;
Output for 4.3.0 - 7.1.0