(PHP 5 >= 5.1.2, PHP 7)
ReflectionClass::hasConstant — Checks if constant is defined
public ReflectionClass::hasConstant ( string $name ) : bool
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"));
?> The above example will output something similar to:
bool(true) bool(false)
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https://www.php.net/manual/en/reflectionclass.hasconstant.php