What are the most commonly used system constants in php?

This article collects some of the most commonly used system constants in PHP for your reference.

System constants

• FILE The relative path of the current PHP file

• LINE The current PHP file The line number

• FUNCTION the current function name, only works for calls within the function

• CLASS the current class name , only works for classes

• PHP_VERSION The currently used PHP version number

• PHP_OS The running operating system of the current PHP environment

• TRUE Same as true

• FALSE Same as false

• M_PI Pi constant value

• M_E The scientific constant e

• M_LOG2E represents log2

• ##e, the logarithm of e with base 2

• M_LOG10E represents lg

• e, the logarithm of e with base 10

• M_LN2 The natural logarithm of 2

• M_LN10 Natural logarithm of 10

• E_ERROR Recent errors

• E_WARNING Recent Warnings

• Potential problems with E_PARSE parsing syntax

• METHOD represents the class method name, such as B::test

Server global Variables

• $_SERVER Returns server related information, returns An

  array

• $_GET All the parameters from the GET request

• $_POST All the parameters from the POST

• $_

  COOKIE All cookies submitted by HTTP

• $_FILES All files submitted by HTTP

• $_ENV Current execution environment information

• $_REQUEST is equivalent to the data submitted by $_POST, $_GET, $_COOKIE, so this variable is not worthy of trust

• $_

  SESSION session session variable

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