Example analysis of get_defined_constants function usage in PHP, VB random function usage and examples_PHP tutorial

Example analysis of get_defined_constants function usage in PHP, VB random function usage and examples

The examples in this article describe the usage of get_defined_constants function in PHP. Share it with everyone for your reference. The specific analysis is as follows:

get_defined_constants (PHP 4 > = 4.1.0, PHP 5)

get_defined_constants - Returns an associative array of names of all constants and their values ​​

Description

Array get_defined_constants ([boolean$collation])

Returns all currently defined constants by name and value. This includes extensions set up and define() functions created.

Parameters

Category

Causes this function to return the first dimension and constants in the multidimensional array category and their values ​​in the second dimension.

<&#63;php
define("MY_CONSTANT", 1);
print_r(get_defined_constants(true));
&#63;> 
The above example will output something similar to:
Array
(
  [internal] => Array
    (
      [E_ERROR] => 1
      [E_WARNING] => 2
      [E_PARSE] => 4
      [E_NOTICE] => 8
      [E_CORE_ERROR] => 16
      [E_CORE_WARNING] => 32
      [E_COMPILE_ERROR] => 64
      [E_COMPILE_WARNING] => 128
      [E_USER_ERROR] => 256
      [E_USER_WARNING] => 512
      [E_USER_NOTICE] => 1024
      [E_ALL] => 2047
      [TRUE] => 1
    )
  [pcre] => Array
    (
      [PREG_PATTERN_ORDER] => 1
      [PREG_SET_ORDER] => 2
      [PREG_OFFSET_CAPTURE] => 256
      [PREG_SPLIT_NO_EMPTY] => 1
      [PREG_SPLIT_DELIM_CAPTURE] => 2
      [PREG_SPLIT_OFFSET_CAPTURE] => 4
      [PREG_GREP_INVERT] => 1
    )
  [user] => Array
    (
      [MY_CONSTANT] => 1
    )
)

I hope this article will be helpful to everyone’s PHP programming design.

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