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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/strings/functions/sprintf.xml doesn't exist. Closest matches:

readline_completion_function
scoutapm_list_instrumented_functions
reflectionfunctionabstract
register_shutdown_function
datemalformedstringexception
register_tick_function
componere_abstract_definition
mongodb_driver_monitoring_commandsubscriber
fann_get_cascade_activation_functions_count
unregister_tick_function
timezone_transitions_get
reflectionfunction
mongodb_driver_monitoring_commandstartedevent
stats_dens_pmf_negative_binomial
componere_definition
datemalformedperiodstringexception
get_defined_functions
commonmark_render_xml
phpdbg_break_function
fann_get_train_stop_function
fann_set_train_stop_function
commonmark_render_html
spl_autoload_functions
mongodb_driver_monitoring_subscriber
datemalformedintervalstringexception
http_get_last_response_headers
fann_set_cascade_activation_functions
fann_get_cascade_activation_functions
mongodb_driver_monitoring_commandfailedevent
domprocessinginstruction

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