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function get_extension_funcs (module_name) {
    // Returns an array with the names of functions belonging to the named extension  
    // 
    // version: 1109.2015
    // discuss at: http://phpjs.org/functions/get_extension_funcs    // +   original by: Brett Zamir (http://brett-zamir.me)
    // *     example 1: get_extension_funcs('json');
    // *     returns 1: ['json_decode', 'json_encode', 'json_last_error']
    this.php_js = this.php_js || {};
    // We put this on the global in order to avoid rebuilding and reuse this object by itself    this.php_js.exts = this.php_js.exts || { // This only includes those extensions for which we have or are working on at least some functions
        array: ['array_change_key_case', 'array_chunk', 'array_combine', 'array_count_values', 'array_diff_assoc', 'array_diff_key', 'array_diff_uassoc', 'array_diff_ukey', 'array_diff', 'array_fill_keys', 'array_fill', 'array_filter', 'array_flip', 'array_intersect_assoc', 'array_intersect_key', 'array_intersect_uassoc', 'array_intersect_ukey', 'array_intersect', 'array_key_exists', 'array_keys', 'array_map', 'array_merge_recursive', 'array_merge', 'array_multisort', 'array_pad', 'array_pop', 'array_product', 'array_push', 'array_rand', 'array_reduce', 'array_replace_recursive', 'array_replace', 'array_reverse', 'array_search', 'array_shift', 'array_slice', 'array_splice', 'array_sum', 'array_udiff_assoc', 'array_udiff_uassoc', 'array_udiff', 'array_uintersect_assoc', 'array_uintersect_uassoc', 'array_uintersect', 'array_unique', 'array_unshift', 'array_values', 'array_walk_recursive', 'array_walk', 'array', 'arsort', 'asort', 'compact', 'count', 'current', 'each', 'end', 'extract', 'in_array', 'key', 'krsort', 'ksort', 'list', 'natcasesort', 'natsort', 'next', 'pos', 'prev', 'range', 'reset', 'rsort', 'shuffle', 'sizeof', 'sort', 'uasort', 'uksort', 'usort'],
        bc: ['bcadd', 'bccomp', 'bcdiv', 'bcmod', 'bcmul', 'bcpow', 'bcpowmod', 'bcscale', 'bcsqrt', 'bcsub'],
        classkit: ['classkit_import', 'classkit_method_add', 'classkit_method_copy', 'classkit_method_redefine', 'classkit_method_remove', 'classkit_method_rename'],
        classobj: ['call_user_method_array', 'call_user_method', 'class_alias', 'class_exists', 'get_called_class', 'get_class_methods', 'get_class_vars', 'get_class', 'get_declared_classes', 'get_declared_interfaces', 'get_object_vars', 'get_parent_class', 'interface_exists', 'is_a', 'is_subclass_of', 'method_exists', 'property_exists'],        ctype: ['ctype_alnum', 'ctype_alpha', 'ctype_cntrl', 'ctype_digit', 'ctype_graph', 'ctype_lower', 'ctype_print', 'ctype_punct', 'ctype_space', 'ctype_upper', 'ctype_xdigit'],
        datetime: ['checkdate', 'date_add', 'date_create_from_format', 'date_create', 'date_date_set', 'date_default_timezone_get', 'date_default_timezone_set', 'date_diff', 'date_format', 'date_get_last_errors', 'date_interval_create_from_date_string', 'date_interval_format', 'date_isodate_set', 'date_modify', 'date_offset_get', 'date_parse_from_format', 'date_parse', 'date_sub', 'date_sun_info', 'date_sunrise', 'date_sunset', 'date_time_set', 'date_timestamp_get', 'date_timestamp_set', 'date_timezone_get', 'date_timezone_set', 'date', 'getdate', 'gettimeofday', 'gmdate', 'gmmktime', 'gmstrftime', 'idate', 'localtime', 'microtime', 'mktime', 'strftime', 'strptime', 'strtotime', 'time', 'timezone_abbreviations_list', 'timezone_identifiers_list', 'timezone_location_get', 'timezone_name_from_abbr', 'timezone_name_get', 'timezone_offset_get', 'timezone_open', 'timezone_transitions_get', 'timezone_version_get'],
        dir: ['chdir', 'chroot', 'dir', 'closedir', 'getcwd', 'opendir', 'readdir', 'rewinddir', 'scandir'],
        errorfunc: ['debug_backtrace', 'debug_print_backtrace', 'error_get_last', 'error_log', 'error_reporting', 'restore_error_handler', 'restore_exception_handler', 'set_error_handler', 'set_exception_handler', 'trigger_error', 'user_error'],
        exec: ['escapeshellarg', 'escapeshellcmd', 'exec', 'passthru', 'proc_close', 'proc_get_status', 'proc_nice', 'proc_open', 'proc_terminate', 'shell_exec', 'system'],        filesystem: ['basename', 'chgrp', 'chmod', 'chown', 'clearstatcache', 'copy', 'delete', 'dirname', 'disk_free_space', 'disk_total_space', 'diskfreespace', 'fclose', 'feof', 'fflush', 'fgetc', 'fgetcsv', 'fgets', 'fgetss', 'file_exists', 'file_get_contents', 'file_put_contents', 'file', 'fileatime', 'filectime', 'filegroup', 'fileinode', 'filemtime', 'fileowner', 'fileperms', 'filesize', 'filetype', 'flock', 'fnmatch', 'fopen', 'fpassthru', 'fputcsv', 'fputs', 'fread', 'fscanf', 'fseek', 'fstat', 'ftell', 'ftruncate', 'fwrite', 'glob', 'is_dir', 'is_executable', 'is_file', 'is_link', 'is_readable', 'is_uploaded_file', 'is_writable', 'is_writeable', 'lchgrp', 'lchown', 'link', 'linkinfo', 'lstat', 'mkdir', 'move_uploaded_file', 'parse_ini_file', 'parse_ini_string', 'pathinfo', 'pclose', 'popen', 'readfile', 'readlink', 'realpath', 'rename', 'rewind', 'rmdir', 'set_file_buffer', 'stat', 'symlink', 'tempnam', 'tmpfile', 'touch', 'umask', 'unlink'],
        funchand: ['call_user_func_array', 'call_user_func', 'create_function', 'forward_static_call_array', 'forward_static_call', 'func_get_arg', 'func_get_args', 'func_num_args', 'function_exists', 'get_defined_functions', 'register_shutdown_function', 'register_tick_function', 'unregister_tick_function'],
        // Moving to http://us.php.net/manual/en/class.locale.php ?
        i18n: ['locale_get_default', 'locale_set_default'],
        inclued: ['inclued_get_data'],        info: ['assert_options', 'assert', 'dl', 'extension_loaded', 'gc_collect_cycles', 'gc_disable', 'gc_enable', 'gc_enabled', 'get_cfg_var', 'get_current_user', 'get_defined_constants', 'get_extension_funcs', 'get_include_path', 'get_included_files', 'get_loaded_extensions', 'get_magic_quotes_gpc', 'get_magic_quotes_runtime', 'get_required_files', 'getenv', 'getlastmod', 'getmygid', 'getmyinode', 'getmypid', 'getmyuid', 'getopt', 'getrusage', 'ini_alter', 'ini_get_all', 'ini_get', 'ini_restore', 'ini_set', 'magic_quotes_runtime', 'main', 'memory_get_peak_usage', 'memory_get_usage', 'php_ini_loaded_file', 'php_ini_scanned_files', 'php_logo_guid', 'php_sapi_name', 'php_uname', 'phpcredits', 'phpinfo', 'phpversion', 'putenv', 'restore_include_path', 'set_include_path', 'set_magic_quotes_runtime', 'set_time_limit', 'sys_get_temp_dir', 'version_compare', 'zend_logo_guid', 'zend_thread_id', 'zend_version'],
        json: ['json_decode', 'json_encode', 'json_last_error'],
        // Note that "language" is not a real extension, but part of the PHP language which we implement as JavaScript functions
        language: ['at', 'clone', 'declare', 'foreach', 'goto', 'include', 'include_once', 'php_user_filter', 'require', 'require_once', 'stdClass', 'ErrorException', 'Exception', 'HEREDOC', '$_SESSION', '__CLASS__', '__DIR__', '__FILE__', '__FUNCTION__', '__LINE__', '__METHOD__'],
        math: ['abs', 'acos', 'acosh', 'asin', 'asinh', 'atan2', 'atan', 'atanh', 'base_convert', 'bindec', 'ceil', 'cos', 'cosh', 'decbin', 'dechex', 'decoct', 'deg2rad', 'exp', 'expm1', 'floor', 'fmod', 'getrandmax', 'hexdec', 'hypot', 'is_finite', 'is_infinite', 'is_nan', 'lcg_value', 'log10', 'log1p', 'log', 'max', 'min', 'mt_getrandmax', 'mt_rand', 'mt_srand', 'octdec', 'pi', 'pow', 'rad2deg', 'rand', 'round', 'sin', 'sinh', 'sqrt', 'srand', 'tan', 'tanh'],        misc: ['connection_aborted', 'connection_status', 'connection_timeout', 'constant', 'define', 'defined', 'die', 'eval', 'exit', 'get_browser', '__halt_compiler', 'highlight_file', 'highlight_string', 'ignore_user_abort', 'pack', 'php_check_syntax', 'php_strip_whitespace', 'show_source', 'sleep', 'sys_getloadavg', 'time_nanosleep', 'time_sleep_until', 'uniqid', 'unpack', 'usleep'],
        'net-gopher': ['gopher_parsedir'],
        network: ['checkdnsrr', 'closelog', 'define_syslog_variables', 'dns_check_record', 'dns_get_mx', 'dns_get_record', 'fsockopen', 'gethostbyaddr', 'gethostbyname', 'gethostbynamel', 'gethostname', 'getmxrr', 'getprotobyname', 'getprotobynumber', 'getservbyname', 'getservbyport', 'header_remove', 'header', 'headers_list', 'headers_sent', 'inet_ntop', 'inet_pton', 'ip2long', 'long2ip', 'openlog', 'pfsockopen', 'setcookie', 'setrawcookie', 'socket_get_status', 'socket_set_blocking', 'socket_set_timeout', 'syslog'],
        objaggregation: ['aggregate_info', 'aggregate_methods_by_list', 'aggregate_methods_by_regexp', 'aggregate_methods', 'aggregate_properties_by_list', 'aggregate_properties_by_regexp', 'aggregate_properties', 'aggregate', 'aggregation_info', 'deaggregate'],
        outcontrol: ['flush', 'ob_clean', 'ob_end_clean', 'ob_end_flush', 'ob_flush', 'ob_get_clean', 'ob_get_contents', 'ob_get_flush', 'ob_get_length', 'ob_get_level', 'ob_get_status', 'ob_gzhandler', 'ob_implicit_flush', 'ob_list_handlers', 'ob_start', 'output_add_rewrite_var', 'output_reset_rewrite_vars'],        overload: ['overload'],
        pcre: ['preg_filter', 'preg_grep', 'preg_last_error', 'preg_match_all', 'preg_match', 'preg_quote', 'preg_replace_callback', 'preg_replace', 'preg_split'],
        runkit: ['Runkit_Sandbox', 'Runkit_Sandbox_Parent', 'runkit_class_adopt', 'runkit_class_emancipate', 'runkit_constant_add', 'runkit_constant_redefine', 'runkit_constant_remove', 'runkit_function_add', 'runkit_function_copy', 'runkit_function_redefine', 'runkit_function_remove', 'runkit_function_rename', 'runkit_import', 'runkit_lint_file', 'runkit_lint', 'runkit_method_add', 'runkit_method_copy', 'runkit_method_redefine', 'runkit_method_remove', 'runkit_method_rename', 'runkit_return_value_used', 'runkit_sandbox_output_handler', 'runkit_superglobals'],
        session: ['session_cache_expire', 'session_cache_limiter', 'session_commit', 'session_decode', 'session_destroy', 'session_encode', 'session_get_cookie_params', 'session_id', 'session_is_registered', 'session_module_name', 'session_name', 'session_regenerate_id', 'session_register', 'session_save_path', 'session_set_cookie_params', 'session_set_save_handler', 'session_start', 'session_unregister', 'session_unset', 'session_write_close'],
        stream: ['set_socket_blocking', 'stream_bucket_append', 'stream_bucket_make_writeable', 'stream_bucket_new', 'stream_bucket_prepend', 'stream_context_create', 'stream_context_get_default', 'stream_context_get_options', 'stream_context_get_params', 'stream_context_set_default', 'stream_context_set_option', 'stream_context_set_params', 'stream_copy_to_stream', 'stream_encoding', 'stream_filter_append', 'stream_filter_prepend', 'stream_filter_register', 'stream_filter_remove', 'stream_get_contents', 'stream_get_filters', 'stream_get_line', 'stream_get_meta_data', 'stream_get_transports', 'stream_get_wrappers', 'stream_is_local', 'stream_notification_callback', 'stream_register_wrapper', 'stream_resolve_include_path', 'stream_select', 'stream_set_blocking', 'stream_set_timeout', 'stream_set_write_buffer', 'stream_socket_accept', 'stream_socket_client', 'stream_socket_enable_crypto', 'stream_socket_get_name', 'stream_socket_pair', 'stream_socket_recvfrom', 'stream_socket_sendto', 'stream_socket_server', 'stream_socket_shutdown', 'stream_supports_lock', 'stream_wrapper_register', 'stream_wrapper_restore', 'stream_wrapper_unregister'],        strings: ['addcslashes', 'addslashes', 'bin2hex', 'chop', 'chr', 'chunk_split', 'convert_cyr_string', 'convert_uudecode', 'convert_uuencode', 'count_chars', 'crc32', 'crypt', 'echo', 'explode', 'fprintf', 'get_html_translation_table', 'hebrev', 'hebrevc', 'html_entity_decode', 'htmlentities', 'htmlspecialchars_decode', 'htmlspecialchars', 'implode', 'join', 'lcfirst', 'levenshtein', 'localeconv', 'ltrim', 'md5_file', 'md5', 'metaphone', 'money_format', 'nl_langinfo', 'nl2br', 'number_format', 'ord', 'parse_str', 'print', 'printf', 'quoted_printable_decode', 'quoted_printable_encode', 'quotemeta', 'rtrim', 'setlocale', 'sha1_file', 'sha1', 'similar_text', 'soundex', 'sprintf', 'sscanf', 'str_getcsv', 'str_ireplace', 'str_pad', 'str_repeat', 'str_replace', 'str_rot13', 'str_shuffle', 'str_split', 'str_word_count', 'strcasecmp', 'strchr', 'strcmp', 'strcoll', 'strcspn', 'strip_tags', 'stripcslashes', 'stripos', 'stripslashes', 'stristr', 'strlen', 'strnatcasecmp', 'strnatcmp', 'strncasecmp', 'strncmp', 'strpbrk', 'strpos', 'strrchr', 'strrev', 'strripos', 'strrpos', 'strspn', 'strstr', 'strtok', 'strtolower', 'strtoupper', 'strtr', 'substr_compare', 'substr_count', 'substr_replace', 'substr', 'trim', 'ucfirst', 'ucwords', 'vfprintf', 'vprintf', 'vsprintf', 'wordwrap'],
        tokenizer: ['token_get_all', 'token_name'],
        url: ['base64_decode', 'base64_encode', 'get_headers', 'get_meta_tags', 'http_build_query', 'parse_url', 'rawurldecode', 'rawurlencode', 'urldecode', 'urlencode'],
        'var': ['debug_zval_dump', 'doubleval', 'empty', 'floatval', 'get_defined_vars', 'get_resource_type', 'gettype', 'import_request_variables', 'intval', 'is_array', 'is_binary', 'is_bool', 'is_buffer', 'is_callable', 'is_double', 'is_float', 'is_int', 'is_integer', 'is_long', 'is_null', 'is_numeric', 'is_object', 'is_real', 'is_resource', 'is_scalar', 'is_string', 'is_unicode', 'isset', 'print_r', 'serialize', 'settype', 'strval', 'unserialize', 'unset', 'var_dump', 'var_export'],
        xml: ['utf8_decode', 'utf8_encode', 'xml_error_string', 'xml_get_current_byte_index', 'xml_get_current_column_number', 'xml_get_current_line_number', 'xml_get_error_code', 'xml_parse_into_struct', 'xml_parse', 'xml_parser_create_ns', 'xml_parser_create', 'xml_parser_free', 'xml_parser_get_option', 'xml_parser_set_option', 'xml_set_character_data_handler', 'xml_set_default_handler', 'xml_set_element_handler', 'xml_set_end_namespace_decl_handler', 'xml_set_external_entity_ref_handler', 'xml_set_notation_decl_handler', 'xml_set_object', 'xml_set_processing_instruction_handler', 'xml_set_start_namespace_decl_handler', 'xml_set_unparsed_entity_decl_handler'],        xmlreader: ['XMLReader'],
        // only in class form
        xmlwriter: ['xmlwriter_end_attribute', 'xmlwriter_end_cdata', 'xmlwriter_end_comment', 'xmlwriter_end_document', 'xmlwriter_end_dtd_attlist', 'xmlwriter_end_dtd_element', 'xmlwriter_end_dtd_entity', 'xmlwriter_end_dtd', 'xmlwriter_end_element', 'xmlwriter_end_pi', 'xmlwriter_flush', 'xmlwriter_full_end_element', 'xmlwriter_open_memory', 'xmlwriter_open_uri', 'xmlwriter_output_memory', 'xmlwriter_set_indent_string', 'xmlwriter_set_indent', 'xmlwriter_start_attribute_ns', 'xmlwriter_start_attribute', 'xmlwriter_start_cdata', 'xmlwriter_start_comment', 'xmlwriter_start_document', 'xmlwriter_start_dtd_attlist', 'xmlwriter_start_dtd_element', 'xmlwriter_start_dtd_entity', 'xmlwriter_start_dtd', 'xmlwriter_start_element_ns', 'xmlwriter_start_element', 'xmlwriter_start_pi', 'xmlwriter_text', 'xmlwriter_write_attribute_ns', 'xmlwriter_write_attribute', 'xmlwriter_write_cdata', 'xmlwriter_write_comment', 'xmlwriter_write_dtd_attlist', 'xmlwriter_write_dtd_element', 'xmlwriter_write_dtd_entity', 'xmlwriter_write_dtd', 'xmlwriter_write_element_ns', 'xmlwriter_write_element', 'xmlwriter_write_pi', 'xmlwriter_write_raw']
    };
    return this.php_js.exts[module_name] || false;}

1

get_extension_funcs('json');

1

['json_decode', 'json_encode', 'json_last_error']