define

Description

bool define ( string name, mixed value [, bool case_insensitive] )

Defines a named constant. See the section on constants for more details.

The name of the constant is given by name ; the value is given by value .

The optional third parameter case_insensitive is also available. If the value TRUE is given, then the constant will be defined case-insensitive. The default behaviour is case-sensitive; i.e. CONSTANT and Constant represent different values.

例子 1. Defining Constants <?php define ( "CONSTANT" , "Hello world." ); echo CONSTANT ; // outputs "Hello world." echo Constant ; // outputs "Constant" and issues a notice. define ( "GREETING" , "Hello you." , true ); echo GREETING ; // outputs "Hello you." echo Greeting ; // outputs "Hello you." ?>

如果成功则返回 TRUE ，失败则返回 FALSE 。

See also defined() , constant() and the section on Constants .