GlobalDependency.php

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<?php
class GlobalDependency extends CacheDependency {
    private $name;
    private $value;
 
    function __construct( $name ) {
        $this->name = $name;
        $this->value = $GLOBALS[$name];
    }
 
    function isExpired() {
        if ( !isset( $GLOBALS[$this->name] ) ) {
            return true;
        }
 
        return $GLOBALS[$this->name] != $this->value;
    }
}