Example analysis of get_defined_constants function usage in php_PHP tutorial

Example analysis of get_defined_constants function usage in php

This article describes the usage of get_defined_constants function in php with examples. 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$categorization])

Returns the names and values ​​of all currently defined constants. This includes extensions set up and define() functions created.

Parameters

Category

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

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define("MY_CONSTANT", 1); print_r(get_defined_constants(true)); ?> 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 ) )

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<🎜>define("MY_CONSTANT", 1);<🎜> <🎜>print_r(get_defined_constants(true));<🎜> <🎜>?> 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. http://www.bkjia.com/PHPjc/1000110.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1000110.htmlTechArticleExample analysis of get_defined_constants function usage in php. This article describes the usage of get_defined_constants function in php. Share it with everyone for your reference. The specific analysis is as follows: get_define...