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Getting Started: Introduction; A simple tutorial
Language Reference: Basic syntax; Types; Variables; Constants; Expressions; Operators; Control Structures; Functions; Classes and Objects; Namespaces; Enumerations; Errors; Exceptions; Fibers; Generators; Attributes; References Explained; Predefined Variables; Predefined Exceptions; Predefined Interfaces and Classes; Predefined Attributes; Context options and parameters; Supported Protocols and Wrappers

Security: Introduction; General considerations; Installed as CGI binary; Installed as an Apache module; Session Security; Filesystem Security; Database Security; Error Reporting; User Submitted Data; Hiding PHP; Keeping Current
Features: HTTP authentication with PHP; Cookies; Sessions; Handling file uploads; Using remote files; Connection handling; Persistent Database Connections; Command line usage; Garbage Collection; DTrace Dynamic Tracing

Function Reference: Affecting PHP's Behaviour; Audio Formats Manipulation; Authentication Services; Command Line Specific Extensions; Compression and Archive Extensions; Cryptography Extensions; Database Extensions; Date and Time Related Extensions; File System Related Extensions; Human Language and Character Encoding Support; Image Processing and Generation; Mail Related Extensions; Mathematical Extensions; Non-Text MIME Output; Process Control Extensions; Other Basic Extensions; Other Services; Search Engine Extensions; Server Specific Extensions; Session Extensions; Text Processing; Variable and Type Related Extensions; Web Services; Windows Only Extensions; XML Manipulation; GUI Extensions

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PHP Function List

first-https-github.com/php/doc-en/blob/master/reference/classobj/functions/class-exists.xml doesn't exist. Closest matches:

mongodb_driver_exception_sslconnectionexception
hrtime_performancecounter
commonmark_interfaces_ivisitable
timezone_abbreviations_list
phpdbg_break_function
scoutapm_list_instrumented_functions
commonmark_render_latex
commonmark_interfaces_ivisitor
mongodb_driver_exception_connectionexception
register_shutdown_function
componere_definition
mongodb_driver_exception_commandexception
readline_completion_function
get_defined_functions
register_tick_function
spl_autoload_functions
mongodb_driver_exception_connectiontimeoutexception
reflectionclassconstant
xmlrpc_server_register_introspection_callback
unregister_tick_function
pspell_store_replacement
timezone_transitions_get
mongodb_driver_exception_logicexception
http_clear_last_response_headers
mongodb_driver_serverdescription
mongodb_driver_exception_serverexception
reflectionfunctionabstract
get_html_translation_table
eventhttpconnection
pg_connection_reset

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