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PHP 8.1.32 Released!

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

function.httpresponse-setheader doesn't exist. Closest matches:

http_get_last_response_headers
http_clear_last_response_headers
http_response_code
apache_response_headers
swoole_http_response
ui_controls_slider
runkit7_function_rename
reflectionparameter
function_exists
eventhttprequest
compersisthelper
ui_controls_entry
fann_set_activation_steepness_layer
apache_request_headers
reflectionconstant
reflectionproperty
zip_entry_compressionmethod
fann_set_activation_steepness_hidden
reflectionclassconstant
runkit7_function_remove
reflectionattribute
pg_connection_reset
badfunctioncallexception
ui_controls_tab
mb_encode_mimeheader
imap_rfc822_parse_headers
runkit7_function_redefine
iconv_mime_decode_headers
reflectionmethod
fann_reset_errno

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