ReflectionClass::getConstant()

(PHP 5, PHP 7)

获取定义过的一个常量

说明

publicReflectionClass::getConstant(string $name): mixed

获取定义过的一个常量。

Warning

本函数还未编写文档，仅有参数列表。

参数

$name

常量的名称。

返回值

常量的值。

参见

• ReflectionClass::getConstants() 获取一组常量

If the $name constant doesn't exist in the targetted class the function returns bool(false), not empty nor null but false (you to test with "==="
$constFounded = false ;
$this->currentlangClass = new ReflectionClass($langFile);
$this->currentlangClass->getConstant($constant);
if($myConst !== false){
       $constFounded = true ;
}

The "getconstant" method can be used to get the value associated with a constant 
of a particular class that you are examining.
The following code snippet shows this:
<?php
  class Test{
    const ONE = "Number one";
    const TWO = "Number two";
  }
  
  $obj = new ReflectionClass( "Test" );
  echo $obj->getconstant( "ONE" )."\n";
  echo $obj->getconstant( "TWO" )."\n";
  
?>
output:
Number one
Number two