Example Analysis of get_defined_constants function usage in php, vb random function usage and instance

Source: Internet
Author: User

Example Analysis of get_defined_constants function usage in php, vb random function usage and instance

This example describes the usage of the get_defined_constants function in php. Share it with you for your reference. The specific analysis is as follows:

Get_defined_constants (PHP 4> = 4.1.0, PHP 5)

Get_defined_constants-returns an associated array name for all constants and their values

Description

Array get_defined_constants ([Boolean $ category])

Returns all the currently defined constants of the name and value. This includes the created extension and the created define () function.

Parameters

Category

This function returns the first dimension and constant in the multi-dimensional array category and the second aspect of their values.

<?phpdefine("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 help you with php programming.

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