Edit: JsonSerializable.php

<?php // @codeCoverageIgnoreStart /** * Placeholder for missing interface in PHP < 5.4. * Can't be invoked automatically, so always do: json_encode( $obj->jsonSerialize() ) * Note that this shim is also present in WordPress >= 4.4.0 */ if( ! interface_exists('JsonSerializable') ){ interface JsonSerializable { public function jsonSerialize(); } } // @codeCoverageIgnoreEnd /** * Redundant interface so this file will autoload when JsonSerializable is referenced * @internal */ interface Loco_compat_JsonSerializable extends JsonSerializable { }

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