Edit: class-IXR-value.php

<?php
/**
 * IXR_Value
 *
 * @package IXR
 * @since 1.5.0
 */
class IXR_Value {
    var $data;
    var $type;

/**
	 * PHP5 constructor.
	 */
	function __construct( $data, $type = false )
    {
        $this->data = $data;
        if (!$type) {
            $type = $this->calculateType();
        }
        $this->type = $type;
        if ($type == 'struct') {
            // Turn all the values in the array in to new IXR_Value objects
            foreach ($this->data as $key => $value) {
                $this->data[$key] = new IXR_Value($value);
            }
        }
        if ($type == 'array') {
            for ($i = 0, $j = count($this->data); $i < $j; $i++) {
                $this->data[$i] = new IXR_Value($this->data[$i]);
            }
        }
    }

/**
	 * PHP4 constructor.
	 */
	public function IXR_Value( $data, $type = false ) {
		self::__construct( $data, $type );
	}

// Deal with IXR object types base64 and date
        if (is_object($this->data) && is_a($this->data, 'IXR_Date')) {
            return 'date';
        }
        if (is_object($this->data) && is_a($this->data, 'IXR_Base64')) {
            return 'base64';
        }

// If it is a normal PHP object convert it in to a struct
        if (is_object($this->data)) {
            $this->data = get_object_vars($this->data);
            return 'struct';
        }
        if (!is_array($this->data)) {
            return 'string';
        }

// We have an array - is it an array or a struct?
        if ($this->isStruct($this->data)) {
            return 'struct';
        } else {
            return 'array';
        }
    }

/**
     * Checks whether or not the supplied array is a struct or not
     *
     * @param array $array
     * @return bool
     */
    function isStruct($array)
    {
        $expected = 0;
        foreach ($array as $key => $value) {
            if ((string)$key !== (string)$expected) {
                return true;
            }
            $expected++;
        }
        return false;
    }
}

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