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From the first Google hit for "PHP object to assoc array" we have this:

function object_to_array($data)
{
    if (is_array($data) || is_object($data))
    {
        $result = [];
        foreach ($data as $key => $value)
        {
            $result[$key] = (is_array($value) || is_object($value)) ? object_to_array($value) : $value;
        }
        return $result;
    }
    return $data;
}

The source is at codesnippets.joyent.com.

To compare it to the solution of json_decode & json_encode, this one seems faster. Here is a random benchmark (using the simple time measuring):

$obj = (object) [
    'name'    =>'Mike',
    'surname' =>'Jovanson',
    'age'     =>'45',
    'time'    =>1234567890,
    'country' =>'Germany',
];

##### 100 000 cycles ######
* json_decode(json_encode($var))   : 4.15 sec
* object_to_array($var)            : 0.93 sec

From the first Google hit for "PHP object to assoc array" we have this:

/**
 * @param array|object $data 
 * @return array
 */
function object_to_array($data)
{
    $result = [];
    foreach ($data as $key => $value)
    {
        $result[$key] = (is_array($value) || is_object($value)) ? object_to_array($value) : $value;
    }
    return $result;
}

The original source was from codesnippets.joyent.com and has been changed according to @SpYk3HH's comment; see also Object Iteration.

To compare it to the solution of json_decode & json_encode, this one seems faster. Here is a random benchmark (using the simple time measuring):

$obj = (object) [
    'name'    =>'Mike',
    'surname' =>'Jovanson',
    'age'     =>'45',
    'time'    =>1234567890,
    'country' =>'Germany',
];

##### 100 000 cycles ######
* json_decode(json_encode($var))   : 4.15 sec
* object_to_array($var)            : 0.93 sec

From the first Google hit for "PHP object to assoc array" we have this:

function object_to_array($data)
{
    if (is_array($data) || is_object($data))
    {
        $result = [];
        foreach ($data as $key => $value)
        {
            $result[$key] = (is_array($data) || is_object($data)) ? object_to_array($value) : $value;
        }
        return $result;
    }
    return $data;
}

The source is at codesnippets.joyent.com.

To compare it to the solution of json_decode & json_encode, this one seems faster. Here is a random benchmark (using the simple time measuring):

$obj = (object) [
    'name'    =>'Mike',
    'surname' =>'Jovanson',
    'age'     =>'45',
    'time'    =>1234567890,
    'country' =>'Germany',
];

##### 100 000 cycles ######
* json_decode(json_encode($var))   : 4.15 sec
* object_to_array($var)            : 0.93 sec

From the first Google hit for "PHP object to assoc array" we have this:

function object_to_array($data)
{
    if (is_array($data) || is_object($data))
    {
        $result = [];
        foreach ($data as $key => $value)
        {
            $result[$key] = (is_array($value) || is_object($value)) ? object_to_array($value) : $value;
        }
        return $result;
    }
    return $data;
}

The source is at codesnippets.joyent.com.

To compare it to the solution of json_decode & json_encode, this one seems faster. Here is a random benchmark (using the simple time measuring):

$obj = (object) [
    'name'    =>'Mike',
    'surname' =>'Jovanson',
    'age'     =>'45',
    'time'    =>1234567890,
    'country' =>'Germany',
];

##### 100 000 cycles ######
* json_decode(json_encode($var))   : 4.15 sec
* object_to_array($var)            : 0.93 sec

From the first Google hit for "PHP object to assoc array" we have this:

function object_to_array($data)
{
    if (is_array($data) || is_object($data))
    {
        $result = array();
        foreach ($data as $key => $value)
        {
            $result[$key] = (is_array($data) || is_object($data)) ? object_to_array($value) : $value;
        }
        return $result;
    }
    return $data;
}

The source is at codesnippets.joyent.com.

To compare it to the solution of json_decode & json_encode, this one seems faster. Here is a random benchmark (using the simple time measuring):

$obj = (object) [
    'name'    =>'Mike',
    'surname' =>'Jovanson',
    'age'     =>'45',
    'time'    =>1234567890,
    'country' =>'Germany',
];

##### 100 000 cycles ######
* json_decode(json_encode($var))   : 4.15 sec
* object_to_array($var)            : 0.93 sec

From the first Google hit for "PHP object to assoc array" we have this:

function object_to_array($data)
{
    if (is_array($data) || is_object($data))
    {
        $result = [];
        foreach ($data as $key => $value)
        {
            $result[$key] = (is_array($data) || is_object($data)) ? object_to_array($value) : $value;
        }
        return $result;
    }
    return $data;
}

The source is at codesnippets.joyent.com.

To compare it to the solution of json_decode & json_encode, this one seems faster. Here is a random benchmark (using the simple time measuring):

$obj = (object) [
    'name'    =>'Mike',
    'surname' =>'Jovanson',
    'age'     =>'45',
    'time'    =>1234567890,
    'country' =>'Germany',
];

##### 100 000 cycles ######
* json_decode(json_encode($var))   : 4.15 sec
* object_to_array($var)            : 0.93 sec