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Elance test answers : earn money Elance

Elance test answers : earn money Elance

Elance PHP5 Code Test Answer

Here is the list of problems with correct answers for Elance PHP5 Code Test:

1. recursive xml traversal:

01	function ReadXml($xmlstr)

02

{

03	static $res = '';

04	$xml = new SimpleXMLElement($xmlstr);

05

06	if(count($xml->children()))

07

{

08	$res .= $xml->getName().PHP_EOL;

09	foreach($xml->children() as $child)

10

{

11	ReadXml($child->asXML());

12

}

13

}

14

else

15

{

16	$res .= $xml->getName().': '.(string)$xml.PHP_EOL;

17

}

18

19	return $res;

20

}

2. (sql) select the second highest id from user table:

1	SELECT id FROM user ORDER BY id DESC LIMIT 1,1

3. get checkbox values from POST:

1	$res = array();

2	while(list($checkbox,) = each($_POST))

3

{

4	$res[] = intval(substr($checkbox,strpos($checkbox,'_') + 1));

5

}

6	sort($res);

7	echo implode(' ',$res);

4. get unique array elements:

1	function GetUniqueOnes($arr)

2

{

3	$res = implode(',',array_unique($arr));

4

5	return $res;

6

}

5. generate random password:

01	function GeneratePassword ($length,$chars)

02

{

03	$res = '';

04	$char_length = strlen($chars);

05	for($i = 0; $i < $length; $i++)

06

{

07	$res .= $chars[rand(0,$char_length)];

08

}

09

10	return $res;

11

}

6. split email addresses:

1	function SplitEmailAddress($address)

2

{

3	list($user, $domain) = explode('@',$address);

4	return array('user' => $user, 'domain' => $domain);

5

}

7. the most challenging task (for me). Phone regexps:

1	function ReformatPhoneNumber($number)

2

{

3	if (preg_match('/^(\d[ -]?){7,12}$/', $number, $matches))

4

{

5	return preg_replace('/[ -]/', '', $number);

6

}

7

8	throw new Exception('Invalid phone number');

9

}

8. get longest string in arguments:

01	function GetLongestString()

02

{

03	$length = 0;

04	foreach(func_get_args() as $arg)

05

{

06

07	$var = strlen($arg);

08	if($var > $length)

09

{

10	$length = $var;

11

}

12

}

13	return $length;

14

}

9. find maximum in nested array:

1	function MaxArray($arr)

2

{

3	$GLOBALS['max'] = 0;

4	array_walk_recursive($arr,create_function('$item,$key','if($item > $GLOBALS["max"]) $GLOBALS["max"] = $item;'));

5	return $GLOBALS['max'];

6

}

10. output all numbers divisable by 8 from 200 to 600 inclusive:

1	for($i = 200; $i <= 592; $i+=8)

2

{

3	echo $i.',';

4

}

5

echo $i;

Note, that all answers are correct, but some of them are not optimized, so you may be in top 20% with this, but not higher. If someone would like to post any improvements to the code snippets above - they are welcome