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PHP Conference Nagoya 2025
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 Manual
Function Reference
Mathematical Extensions
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Mathematical Functions
Introduction
Predefined Constants
RoundingMode
— The RoundingMode Enum
Math Functions
abs
— Absolute value
acos
— Arc cosine
acosh
— Inverse hyperbolic cosine
asin
— Arc sine
asinh
— Inverse hyperbolic sine
atan
— Arc tangent
atan2
— Arc tangent of two variables
atanh
— Inverse hyperbolic tangent
base_convert
— Convert a number between arbitrary bases
bindec
— Binary to decimal
ceil
— Round fractions up
cos
— Cosine
cosh
— Hyperbolic cosine
decbin
— Decimal to binary
dechex
— Decimal to hexadecimal
decoct
— Decimal to octal
deg2rad
— Converts the number in degrees to the radian equivalent
exp
— Calculates the exponent of e
expm1
— Returns exp($num) - 1, computed in a way that is accurate even when the value of number is close to zero
fdiv
— Divides two numbers, according to IEEE 754
floor
— Round fractions down
fmod
— Returns the floating point remainder (modulo) of the division of the arguments
fpow
— Raise one number to the power of another, according to IEEE 754
hexdec
— Hexadecimal to decimal
hypot
— Calculate the length of the hypotenuse of a right-angle triangle
intdiv
— Integer division
is_finite
— Checks whether a float is finite
is_infinite
— Checks whether a float is infinite
is_nan
— Checks whether a float is NAN
log
— Natural logarithm
log10
— Base-10 logarithm
log1p
— Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero
max
— Find highest value
min
— Find lowest value
octdec
— Octal to decimal
pi
— Get value of pi
pow
— Exponential expression
rad2deg
— Converts the radian number to the equivalent number in degrees
round
— Rounds a float
sin
— Sine
sinh
— Hyperbolic sine
sqrt
— Square root
tan
— Tangent
tanh
— Hyperbolic tangent
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