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oDesk PHP Test Answer 2014

1.Does PHP 5 support exceptions?

1. Yes
2. No

2.For the following code: <?php function Expenses() { function Salary() { } function Loan() { function Balance() { } } } ?> Which of the following sequence will run successfully?

1. Expenses();Salary();Loan();Balance();
2. Salary();Expenses();Loan();Balance();
3. Expenses();Salary();Balance();Loan();
4. Balance();Loan();Salary();Expenses();

3.What function should you use to join array elements with a glue string?

1. join_st
2. implode
3. connect
4. make_array
5. None of these

4.What is the best practice for running MySQL queries in PHP? Consider the risk of SQL injection.

1. Use mysql_query() and variables: for example: $input = $_POST['user_input']; mysql_query("INSERT INTO table (column) VALUES ('" . $input . "')");
2. Use PDO prepared statements and parameterized queries: for example: $input= $_POST["user-input"] $stmt = $pdo->prepare('INSERT INTO table (column) VALUES (":input"); $stmt->execute(array(':input' => $input));
3. Use mysql_query() and string escaped variables: for example: $input= $_POST["user-input"] $input_safe = mysql_real_escape_string($input); mysql_query("INSERT INTO table (column) VALUES ('" . $input. "')");
4. Use mysql_query() and variables with a blacklisting check: for example: $blacklist = array("DROP","INSERT","DELETE"); $input= $_POST["user-input"] if (!$array_search($blacklist))) mysql_query("INSERT INTO table (column) VALUES ('" . $input. "')");

5.What is the best way to change the key without changing the value of a PHP array element?

1. $arr[$newkey] = $oldkey; unset($arr[$oldkey]);
2. $arr[$newkey] = $arr[$oldkey]; unset($arr[$oldkey]);
3. $newkey = $arr[$oldkey];unset($arr[$oldkey]);
4. $arr[$newkey] = $oldkey.GetValue(); unset($arr[$oldkey]);

6.What is the correct line to use within the php.ini file, to specify that 128MB would be the maximum amount of memory that a script may use?

1. memory_limit = 128M
2. limit_memory = 128M
3. memory_limit: 128M
4. limit_memory: 128M

7.What is the correct way to send a SMTP (Simple Mail Transfer Protocol) email using PHP?

1. s.sendmail($EmailAddress, [$MessageBody], msg.as_string())
2. sendmail($EmailAddress, "Subject", $MessageBody);
3. mail($EmailAddress, "Subject", $MessageBody);
4. <a href="mailto:$EmailAddress">$MessageBody</a>

8.What is the string concatenation operator in PHP?

1. +
2. ||
3. .
4. |||
5. None of these

9.What will be the output of the following code? <? echo 5 * 6 / 2 + 2 * 3; ?>

1. 1
2. 20
3. 21
4. 23
5. 34

10.What enctype is required for file uploads to work?

1. multipart/form-data
2. multipart
3. file
4. application/octect-stream
5. None of these

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