Plugins, Hooks, & External Modules
Developer methods for
Plugins, Hooks, & External Modules
Hook functions
REDCap Developer Tools:
Documentation for Plugins, Hooks, & External Modules
REDCap Version 16.0.5
redcap_info()
REDCap has a PHP function called redcap_info(), similar to phpinfo(), that can be called from anywhere within a REDCap page, plugin, or hook. Calling the redcap_info() function will automatically render a web page (when viewing the script in a web browser) that will display a table listing all PHP constants and variables that have been pre-defined by REDCap and are thus available for utilization in a hook or plugin. This provides plugin/hook developers with a head start by making known what resources are available that they may utilize in their code. The tables displayed below are the output of the redcap_info() function.
REDCap PHP Constants
| USERID | site_admin |
| SUPER_USER | 1 |
| NOW | 2026-02-01 23:56:21 |
| SERVER_NAME | iihmrdelhi.org |
| PAGE_FULL | /redcap/redcap_v16.0.5/Plugins/index.php |
| APP_PATH_WEBROOT | /redcap/redcap_v16.0.5/ |
| APP_PATH_SURVEY | /redcap/surveys/ |
| APP_PATH_WEBROOT_PARENT | /redcap/ |
| APP_PATH_WEBROOT_FULL | https://iihmrdelhi.org/redcap/ |
| APP_PATH_SURVEY_FULL | https://iihmrdelhi.org/redcap/surveys/ |
| APP_PATH_IMAGES | /redcap/redcap_v16.0.5/Resources/images/ |
| APP_PATH_CSS | /redcap/redcap_v16.0.5/Resources/css/ |
| APP_PATH_JS | /redcap/redcap_v16.0.5/Resources/js/ |
| APP_PATH_DOCROOT | C:\inetpub\wwwroot\redcap\redcap_v16.0.5\ |
| APP_PATH_CLASSES | C:\inetpub\wwwroot\redcap\redcap_v16.0.5\Classes\ |
| APP_PATH_TEMP | C:\inetpub\wwwroot\redcap\temp\ |
| APP_PATH_WEBTOOLS | C:\inetpub\wwwroot\redcap\webtools2\ |
| EDOC_PATH | C:\redcap_edocs\ |
| CONSORTIUM_WEBSITE | https://redcap.vumc.org/consortium/ |
| SHARED_LIB_PATH | https://redcap.vumc.org/consortium/library/ |
REDCap PHP Variables (System-Level)
| The variables below are accessible in the global scope. | |
| config_settings_key | s7-NakN83!%cBqRE*@d8kI7yGrnHY-LEFozgs74L$^dHaGq2Uv&!ucYvyQrbBUAz |
| aafAccessUrl | |
| aafAllowLocalsCreateDB | off |
| aafAud | |
| aafDisplayOnEmailUsers | off |
| aafIss | |
| aafPrimaryField | cn |
| aafScopeTarget | |
| acg_alert_system_custom_text | |
| acg_enabled_global | 0 |
| admin_email_external_user_creation | 0 |
| ai_datasummarization_service_enabled | 0 |
| ai_improvetext_service_enabled | 0 |
| ai_mlmtranslator_service_enabled | 0 |
| ai_services_enabled_global | 0 |
| alerts_allow_email_freeform | 1 |
| alerts_allow_email_variables | 1 |
| alerts_allow_phone_freeform | 1 |
| alerts_allow_phone_variables | 1 |
| alerts_email_freeform_domain_allowlist | |
| allow_auto_variable_naming | 2 |
| allow_create_db_default | 1 |
| allow_kill_mysql_process | 0 |
| allow_outbound_http | 1 |
| amazon_s3_bucket | |
| amazon_s3_endpoint | |
| amazon_s3_endpoint_url | |
| amazon_s3_key | |
| amazon_s3_secret | |
| api_enabled | 1 |
| api_token_request_type | admin_approve |
| auth_meth_global | none |
| auto_prod_changes | 4 |
| auto_prod_changes_check_identifiers | 0 |
| auto_report_stats | 1 |
| auto_report_stats_last_sent | 2026-01-26 |
| autologout_timer | 30 |
| aws_quickstart | 0 |
| azure_app_name | |
| azure_app_secret | |
| azure_comm_api_endpoint | |
| azure_comm_api_key | |
| azure_container | |
| azure_environment | blob.core.windows.net |
| azure_quickstart | 0 |
| bioportal_api_token | |
| bioportal_api_url | https://data.bioontology.org/ |
| bioportal_ontology_list | |
| bioportal_ontology_list_cache_time | |
| bulk_record_delete_enable_global | 1 |
| cache_files_filesystem_path | |
| cache_storage_system | file |
| calendar_feed_enabled_global | 1 |
| certify_text_create | |
| certify_text_prod | |
| clickjacking_prevention | 0 |
| contact_admin_button_url | |
| create_project_custom_text | |
| cron_job_php_ini_file | C:\php\php.ini |
| cross_domain_access_control | |
| data_entry_trigger_enabled | 1 |
| database_query_tool_enabled | 1 |
| db_binlog_format | |
| db_character_set | utf8mb4 |
| db_collation | utf8mb4_unicode_ci |
| default_csv_delimiter | , |
| default_datetime_format | M/D/Y_12 |
| default_number_format_decimal | . |
| default_number_format_thousands_sep | , |
| delete_project_day_lag | 30 |
| disable_strict_transport_security_header | 0 |
| display_inline_pdf_in_pdf | 1 |
| display_project_xml_backup_option | 1 |
| dkim_private_key | |
| do_not_reply_email | |
| drw_upload_option_enabled | 1 |
| dts_enabled_global | 0 |
| edoc_field_option_enabled | 1 |
| edoc_storage_option | 0 |
| email_domain_allowlist | |
| email_logging_enable_global | 1 |
| email_logging_install_time | 2025-02-13 12:18:55 |
| enable_edit_prod_events | 1 |
| enable_edit_prod_repeating_setup | 1 |
| enable_edit_survey_response | 1 |
| enable_field_attachment_video_url | 1 |
| enable_http_compression | 1 |
| enable_ontology_auto_suggest | 1 |
| enable_plotting | 2 |
| enable_plotting_survey_results | 1 |
| enable_projecttype_forms | 1 |
| enable_projecttype_singlesurvey | 1 |
| enable_projecttype_singlesurveyforms | 1 |
| enable_survey_text_to_speech | 1 |
| enable_url_shortener | 1 |
| enable_url_shortener_redcap | 1 |
| enable_user_allowlist | 0 |
| esignature_enabled_global | 1 |
| external_module_alt_paths | |
| external_modules_allow_activation_user_request | 1 |
| external_modules_project_custom_text | |
| external_modules_unsafe_edoc_references_checked | 1 |
| external_modules_updates_available | [] |
| external_modules_updates_available_last_check | 2026-02-01 22:08:00 |
| fhir_break_the_glass_department_type | |
| fhir_break_the_glass_ehr_usertype | SystemLogin |
| fhir_break_the_glass_enabled | |
| fhir_break_the_glass_patient_type | |
| fhir_break_the_glass_token_password | |
| fhir_break_the_glass_token_username | |
| fhir_break_the_glass_token_usertype | EMP |
| fhir_break_the_glass_username_token_base_url | |
| fhir_cdp_allow_auto_adjudication | 1 |
| fhir_convert_timestamp_from_gmt | 0 |
| fhir_custom_mapping_file_id | |
| fhir_custom_text | |
| fhir_data_fetch_interval | 24 |
| fhir_data_mart_create_project | 0 |
| fhir_ddp_enabled | 0 |
| fhir_display_info_project_setup | 1 |
| fhir_include_email_address | 0 |
| fhir_standalone_authentication_flow | standalone_launch |
| fhir_stop_fetch_inactivity_days | 7 |
| fhir_url_user_access | |
| fhir_user_rights_super_users_only | 1 |
| field_bank_enabled | 1 |
| field_comment_log_enabled_default | 1 |
| fieldbank_nih_cde_key | 1801e2fb-f235-4eb3-b71c-345063c6c91e |
| file_repository_allow_public_link | 1 |
| file_repository_enabled | 1 |
| file_repository_upload_max | |
| file_upload_vault_filesystem_authtype | AUTH_DIGEST |
| file_upload_vault_filesystem_container | |
| file_upload_vault_filesystem_host | |
| file_upload_vault_filesystem_password | |
| file_upload_vault_filesystem_path | |
| file_upload_vault_filesystem_private_key_path | |
| file_upload_vault_filesystem_type | |
| file_upload_vault_filesystem_username | |
| file_upload_versioning_global_enabled | 1 |
| footer_links | |
| footer_text | |
| from_email | |
| from_email_domain_exclude | |
| geminiai_api_key | |
| geminiai_api_model | |
| geminiai_api_version | |
| google_cloud_storage_api_bucket_name | |
| google_cloud_storage_api_project_id | |
| google_cloud_storage_api_service_account | |
| google_cloud_storage_api_use_project_subfolder | 1 |
| google_cloud_storage_edocs_bucket | |
| google_cloud_storage_temp_bucket | |
| google_oauth2_client_id | |
| google_oauth2_client_secret | |
| google_recaptcha_default | 0 |
| google_recaptcha_secret_key | |
| google_recaptcha_site_key | |
| google_translate_enabled | 0 |
| googlemap_key | |
| helpfaq_custom_text | |
| homepage_announcement | |
| homepage_announcement_login | 1 |
| homepage_contact | Ranjeet (+917021867928) |
| homepage_contact_email | ranjeet@iihmrdelhi.edu.in |
| homepage_contact_url | |
| homepage_custom_text | |
| homepage_grant_cite | |
| hook_functions_file | C:\inetpub\wwwroot\redcap\hook_functions.php |
| identifier_keywords | name, street, address, city, county, precinct, zip, postal, date, phone, fax, mail, ssn, social security, mrn, dob, dod, medical, record, id, age |
| is_development_server | 0 |
| language_global | English |
| local_storage_use_project_subfolder | 1 |
| login_autocomplete_disable | 0 |
| login_custom_text | |
| login_logo | |
| logout_fail_limit | 5 |
| logout_fail_window | 15 |
| mailgun_api_endpoint | |
| mailgun_api_key | |
| mailgun_domain_name | |
| mandrill_api_key | |
| max_records_development_global | 0 |
| mobile_app_enabled | 1 |
| mosio_display_info_project_setup | 0 |
| mosio_enabled_by_super_users_only | 0 |
| mosio_enabled_global | 1 |
| mtb_enabled | 1 |
| mtb_experimental_enabled | 0 |
| my_profile_enable_edit | 1 |
| my_profile_enable_primary_email_edit | 1 |
| mycap_enable_type | admin |
| mycap_enabled_global | 1 |
| new_form_default_prod_user_access | 1 |
| oauth2_azure_ad_client_id | sarthak.mohapatra |
| oauth2_azure_ad_client_secret | Sarthak@32 |
| oauth2_azure_ad_endpoint_version | V1 |
| oauth2_azure_ad_name | |
| oauth2_azure_ad_primary_admin | |
| oauth2_azure_ad_secondary_admin | |
| oauth2_azure_ad_tenant | common |
| oauth2_azure_ad_username_attribute | userPrincipalName |
| openai_api_key | |
| openai_api_version | |
| openai_endpoint_url | |
| openid_connect_additional_scope | |
| openid_connect_client_id | |
| openid_connect_client_secret | |
| openid_connect_logout | |
| openid_connect_metadata_url | |
| openid_connect_name | |
| openid_connect_override_scope | |
| openid_connect_primary_admin | |
| openid_connect_provider_url | |
| openid_connect_response_type | query |
| openid_connect_secondary_admin | |
| openid_connect_username_attribute | username |
| openid_provider_name | |
| openid_provider_url | |
| override_system_bundle_ca | 1 |
| page_hit_threshold_per_minute | 600 |
| password_algo | sha512 |
| password_complexity | 1 |
| password_history_limit | 0 |
| password_length | 9 |
| password_recovery_custom_text | |
| password_reset_duration | 0 |
| pdf_econsent_filesystem_authtype | AUTH_DIGEST |
| pdf_econsent_filesystem_container | |
| pdf_econsent_filesystem_host | |
| pdf_econsent_filesystem_password | |
| pdf_econsent_filesystem_path | |
| pdf_econsent_filesystem_private_key_path | |
| pdf_econsent_filesystem_type | |
| pdf_econsent_filesystem_username | |
| pdf_econsent_system_custom_text | |
| pdf_econsent_system_enabled | 1 |
| pdf_econsent_system_ip | 1 |
| project_dashboard_allow_public | 1 |
| promis_api_base_url | https://www.redcap-cats.org/promis_api/ |
| promis_enabled | 1 |
| promis_registration_id | |
| promis_token | |
| protected_email_mode_global | 1 |
| proxy_hostname | |
| proxy_username_password | |
| pub_matching_email_days | 7 |
| pub_matching_email_limit | 3 |
| pub_matching_email_subject | |
| pub_matching_email_text | |
| pub_matching_emails | 0 |
| pub_matching_enabled | 0 |
| pub_matching_institution | Vanderbilt Meharry |
| randomization_global | 1 |
| rate_limiter_ip_range | |
| read_replica_enable | 0 |
| realtime_webservice_convert_timestamp_from_gmt | 0 |
| realtime_webservice_custom_text | |
| realtime_webservice_data_fetch_interval | 24 |
| realtime_webservice_display_info_project_setup | 1 |
| realtime_webservice_global_enabled | 0 |
| realtime_webservice_source_system_custom_name | |
| realtime_webservice_stop_fetch_inactivity_days | 7 |
| realtime_webservice_url_data | |
| realtime_webservice_url_metadata | |
| realtime_webservice_url_user_access | |
| realtime_webservice_user_rights_super_users_only | 1 |
| record_locking_pdf_vault_filesystem_authtype | AUTH_DIGEST |
| record_locking_pdf_vault_filesystem_container | |
| record_locking_pdf_vault_filesystem_host | |
| record_locking_pdf_vault_filesystem_password | |
| record_locking_pdf_vault_filesystem_path | |
| record_locking_pdf_vault_filesystem_private_key_path | |
| record_locking_pdf_vault_filesystem_type | |
| record_locking_pdf_vault_filesystem_username | |
| redcap_base_url | https://iihmrdelhi.org/redcap/ |
| redcap_base_url_display_error_on_mismatch | 1 |
| redcap_last_install_date | 2026-01-11 |
| redcap_survey_base_url | |
| redcap_updates_available | { "lts": [ { "version_number": "16.0.11", "release_date": "2026-01-30", "release_notes": "Major bug fix" }, { "version_number": "16.0.10", "release_date": "2026-01-29", "release_notes": "New LTS branch based off of REDCap 16.0.9 (Standard)." } ], "std": [ { "version_number": "16.0.9", "release_date": "2026-01-29", "release_notes": "Bug fixes, including a major security fix, + minor improvements" }, { "version_number": "16.0.8", "release_date": "2026-01-22", "release_notes": "Bug fixes + minor improvements" }, { "version_number": "16.0.7", "release_date": "2026-01-15", "release_notes": "Bug fixes + minor improvements" }, { "version_number": "16.0.6", "release_date": "2026-01-08", "release_notes": "Bug fixes + minor improvements" } ], "current_branch": "std", "latest_version": "16.0.9" } |
| redcap_updates_available_last_check | 2026-02-01 22:08:00 |
| redcap_updates_community_password | |
| redcap_updates_community_user | |
| redcap_updates_password | |
| redcap_updates_password_encrypted | 1 |
| redcap_updates_user | |
| redcap_version | 16.0.5 |
| report_stats_url | https://redcap.vumc.org/consortium/collect_stats.php?hostname=iihmrdelhi.org&ip=&alt_hostname=&hostkey_hash=dafb421ef3b27612bc70707aeb527887&num_prots=21&num_prods=3&num_archived=0&rnd982g4078393ae839z1_auto&purposes=0,24,0,0&num_inactive=0&num_users=6&auth_meth=none&version=16.0.5&activeusers1m=1&activeusers6m=1&activeuserstotal=1&usersloggedin1m=0&usersloggedin6m=0&usersloggedintotal=1&hostlabel=International+Institute+Of+Health+Management+Research+-+IIHMR&homepage_contact=Ranjeet+%28%2B917021867928%29&homepage_contact_email=ranjeet@iihmrdelhi.edu.in&admin_email=ranjeet@iihmrdelhi.edu.in&dts=0&ddp=0&ddp_records=0&ddp_fhir=&ddp_fhir_records=&ddp_fhir_values_adjud=&data_mart=&data_mart_records=&data_mart_values=&rand=0&rand_count_multi=0&rand_count_blinded=0&rand_count_logic_trigger=0&dde=0&parentchild=0&cats_dev=0&cats_prod=0&mobile_app_users=1&mobile_app_users1m=1&mobile_app_users6m=1&mobile_app_projects_init=12&mobile_app_projects_sync=12&two_factor=GOOGLE_AUTHENTICATOR,EMAIL&twilio_projects=0&mosio_projects=0&sendgrid_projects=0&full_url=https%3A%2F%2Fiihmrdelhi.org%2Fredcap%2F&site_org_type=&econsent_projects=0&econsent_files=0&aws_quickstart=0&azure_quickstart=0&alerts=0&alerts_projects=0&alerts_projects_prod=0&php_version=8.4.3&mysql_version=8.0&fieldbank=%7B%22nlm%22%3A%220%22%2C%22nci%22%3A%220%22%2C%22redcap%22%3A%220%22%7D&mycap_projects=0&mycap_part_joined=0&mycap_tasks=0&mycap_active_tasks=0&mycap_messages=0&mlm_sys_count=0&mlm_sys_ids=&mlm_proj=0&mlm_proj_langs1=0&mlm_proj_langs2=0&mlm_proj_langs3=0&mlm_proj_langs4ormore=0&mlm_avg_langs_per_proj=NAN&mlm_mdn_langs_per_proj=NAN&mlm_max_langs_per_proj=NAN&ai_service=&ai_projects=0&ai_calls=0&ai_projects_datasum=&ai_projects_editor=&ai_projects_mlm=&ai_calls_datasum=&ai_calls_editor=&ai_calls_mlm=&modules=%5B%5D |
| reports_allow_public | 1 |
| restricted_upload_file_types | ade, adp, apk, appx, appxbundle, bat, cab, chm, cmd, com, cpl, diagcab, diagcfg, diagpack, dll, dmg, ex, exe, hta, img, ins, iso, isp, jar, jnlp, js, jse, lib, lnk, mde, msc, msi, msix, msixbundle, msp, mst, nsh, pif, ps1, scr, sct, shb, sys, vb, vbe, vbs, vhd, vxd, wsc, wsf, wsh, xll |
| rewards_display_info_project_setup | 0 |
| rewards_enable_type | admin |
| rewards_enabled_by_super_users_only | 0 |
| rewards_enabled_global | 0 |
| rewards_enablement_message | |
| rich_text_attachment_embed_enabled | 1 |
| rich_text_image_embed_enabled | 1 |
| salt2 | fpmMkg963ndUzi5r2p9M~WFEsSNL@2KLkBg~MFiyWBZ&V-Z7Q*x#xtC84HKAgT#L!vZfpXA*f-7FXpaWMBsNE#5X@2y^ve!MKvzN%if#!9^3Cp3W2oBRM-5Ksf2NkGz4 |
| sams_logout | |
| send_emails_admin_tasks | 1 |
| sendgrid_api_key | |
| sendgrid_display_info_project_setup | 0 |
| sendgrid_enabled_by_super_users_only | 0 |
| sendgrid_enabled_global | 1 |
| sendit_enabled | 1 |
| sendit_upload_max | |
| shibboleth_logout | |
| shibboleth_override_userinfo | 0 |
| shibboleth_set_userinfo | 0 |
| shibboleth_table_config | {"splash_default":"non-inst-login","table_login_option":"Use local REDCap login","institutions":[{"login_option":"Shibboleth Login","login_text":"Click the image below to login using Shibboleth","login_image":"https:\/\/wiki.shibboleth.net\/confluence\/download\/attachments\/131074\/atl.site.logo?version=2&modificationDate=1502412080059&api=v2","login_url":""}]} |
| shibboleth_user_email_field | |
| shibboleth_user_firstname_field | |
| shibboleth_user_lastname_field | |
| shibboleth_username_field | none |
| superusers_only_create_project | 0 |
| superusers_only_move_to_prod | 1 |
| survey_pid_create_project | |
| survey_pid_mark_completed | |
| survey_pid_move_to_analysis_status | |
| survey_pid_move_to_prod_status | |
| suspend_users_inactive_days | 180 |
| suspend_users_inactive_send_email | 1 |
| suspend_users_inactive_type | |
| system_offline | 0 |
| system_offline_message | |
| temp_files_last_delete | 2026-02-01 23:56:00 |
| test_email_address | redcapemailtest@gmail.com |
| total_cron_instances_max | 20 |
| twilio_display_info_project_setup | 0 |
| twilio_enabled_by_super_users_only | 0 |
| twilio_enabled_global | 1 |
| two_factor_auth_authenticator_enabled | 1 |
| two_factor_auth_duo_enabled | 0 |
| two_factor_auth_duo_hostname | |
| two_factor_auth_duo_ikey | |
| two_factor_auth_duo_skey | |
| two_factor_auth_email_enabled | 1 |
| two_factor_auth_enabled | 1 |
| two_factor_auth_enforce_table_users_only | 0 |
| two_factor_auth_esign_once_per_session | 0 |
| two_factor_auth_esign_pin | 0 |
| two_factor_auth_ip_check_enabled | 0 |
| two_factor_auth_ip_range | |
| two_factor_auth_ip_range_alt | |
| two_factor_auth_ip_range_include_private | 0 |
| two_factor_auth_trust_period_days | 0 |
| two_factor_auth_trust_period_days_alt | 0 |
| two_factor_auth_twilio_account_sid | |
| two_factor_auth_twilio_auth_token | |
| two_factor_auth_twilio_enabled | 0 |
| two_factor_auth_twilio_from_number | |
| two_factor_auth_twilio_from_number_voice_alt | |
| use_email_display_name | 1 |
| user_access_dashboard_custom_notification | |
| user_access_dashboard_enable | 1 |
| user_custom_expiration_message | |
| user_messaging_enabled | 1 |
| user_messaging_prevent_admin_messaging | 0 |
| user_sponsor_dashboard_enable | 1 |
| user_sponsor_set_expiration_days | 365 |
| user_welcome_email_external_user_creation | 0 |
| user_with_sponsor_custom_expiration_message | |
REDCap PHP Variables (Project-Level)
|
The variables below are accessible in the global scope. Select one of the projects below that you currently have access to in order to view its project-level variables/values. |
REDCap 16.0.5 - © 2026 Vanderbilt University