ConstantDependency.php

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<?php
class ConstantDependency extends CacheDependency {
    private $name;
    private $value;
 
    public function __construct( $name ) {
        $this->name = $name;
        $this->value = constant( $name );
    }
 
    public function isExpired() {
        return constant( $this->name ) != $this->value;
    }
}