GlobalDependency.php

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<?php
namespace MediaWiki\Language\Dependency;
 
class GlobalDependency extends CacheDependency {
    private $name;
    private $value;
 
    public function __construct( string $name ) {
        $this->name = $name;
        $this->value = $GLOBALS[$name];
    }
 
    public function isExpired( $callback = null ) {
        if ( !isset( $GLOBALS[$this->name] ) ) {
            if ( is_callable( $callback ) ) {
                $callback( "No global named {$this->name}" );
            }
            return true;
        }
 
        if ( $GLOBALS[$this->name] != $this->value ) {
            if ( is_callable( $callback ) ) {
                // @ silences "var_export does not handle circular references";
                // phpcs:disable Generic.PHP.NoSilencedErrors.Discouraged
                $old = @var_export( $this->value, true );
                $new = @var_export( $GLOBALS[$this->name], true );
                // phpcs:enable Generic.PHP.NoSilencedErrors.Discouraged
                $callback( "Value of global {$this->name} changed from {$old} to {$new}" );
            }
            return true;
        }
 
        return false;
    }
}