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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; Dealing with XForms; 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

strtolower and comments - internally str_ireplace converts $search and $replace to lowercase to find matches. doesn't exist. Closest matches:

readline_callback_handler_remove
readline_callback_handler_install
random_engine_xoshiro256starstar
stream_context_set_options
openssl_get_cert_locations
stats_rand_gen_noncentral_chisquare
stream_context_create
xml_set_start_namespace_decl_handler
componere_abstract_definition
array_replace_recursive
pcntl_signal_get_handler
stream_context_set_params
runkit7_constant_redefine
stream_context_set_option
domentityreference
libxml_use_internal_errors
oci_get_implicit_resultset
stream_context_get_options
xml_set_end_namespace_decl_handler
readline_callback_read_char
xml_set_external_entity_ref_handler
random_engine_secure
dbase_replace_record
odbc_connection_string_quote
stream_filter_prepend
openal_context_create
stats_stat_percentile
random_randomexception
commonmark_interfaces_ivisitor
random_cryptosafeengine

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