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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

quickref.php/manual/en/function.sodium-crypto-aead-aes256gcm-is-available.php doesn't exist. Closest matches:

sodium_crypto_aead_aes256gcm_is_available
sodium_crypto_aead_aes256gcm_encrypt
sodium_crypto_aead_aes256gcm_decrypt
sodium_crypto_aead_aes256gcm_keygen
sodium_crypto_scalarmult_base
sodium_crypto_scalarmult
runkit7_function_redefine
sodium_crypto_scalarmult_ristretto255
sodium_crypto_sign_publickey
fann_set_activation_steepness_layer
runkit7_function_rename
runkit7_function_remove
sodium_crypto_core_ristretto255_scalar_mul
sodium_crypto_core_ristretto255_scalar_sub
sodium_crypto_scalarmult_ristretto255_base
sodium_crypto_aead_chacha20poly1305_keygen
sodium_crypto_kx_client_session_keys
sodium_crypto_kx_server_session_keys
sodium_crypto_core_ristretto255_scalar_complement
sodium_crypto_kdf_keygen
sodium_crypto_aead_chacha20poly1305_decrypt
sodium_crypto_aead_chacha20poly1305_encrypt
sodium_crypto_sign_seed_keypair
reflectionparameter
commonmark_interfaces_ivisitable
sodium_crypto_core_ristretto255_scalar_invert
sodium_crypto_core_ristretto255_scalar_reduce
sodium_crypto_core_ristretto255_scalar_negate
sodium_crypto_sign_keypair
reflectionfunctionabstract

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