(PHP 5 >= 5.1.0)
ReflectionClass::hasConstant — Checks if constant is defined
$name
)Checks whether the class has a specific constant defined or not.
name
The name of the constant being checked for.
TRUE if the constant is defined, otherwise FALSE.
Example #1 ReflectionClass::hasConstant() example
<?php
class Foo {
const c1 = 1;
}
$class = new ReflectionClass("Foo");
var_dump($class->hasConstant("c1"));
var_dump($class->hasConstant("c2"));
?>
以上例程的输出类似于：
bool(true) bool(false)