PHP Web Developer Assessment Test

2.

Which is used for one-way string hashing?

Crypt()
Crc32()
Hebrevc()
Count_chars()

Correct Answer

A. Crypt()

Explanation

The crypt() function is used for one-way string hashing. It takes a string and a salt as input and returns a hashed string. The hashed string cannot be reversed back to the original string, making it suitable for password storage. The crc32(), hebrevc(), and count_chars() functions do not perform one-way string hashing.

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3.

What is the difference between Unix and Windows platforms when specifying a path?

They both use / and \
They use / only
They use \ only
One uses / and \ while the other uses / only

Correct Answer

A. One uses / and \ while the other uses / only

Explanation

Unix and Windows platforms have different conventions when specifying a path. Unix systems use the forward slash (/) as the path separator, while Windows systems use the backslash (\). However, it is worth noting that both Unix and Windows platforms can interpret the forward slash (/) as a valid path separator. Therefore, the correct answer is that Unix uses both forward slash (/) and backslash (\) as path separators, while Windows only uses the forward slash (/).

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4.

Which constant set small nodes allocation optimization?

LIBXML_NOENT
LIBXML_COMPACT
LIBXML_NOEMPTYTAG
LIBXML_DTDLOAD

Correct Answer

A. LIBXML_COMPACT

Explanation

LIBXML_COMPACT is the correct answer because it is a constant that enables small nodes allocation optimization. This means that when this constant is used, the memory usage for parsing XML documents is reduced by allocating smaller memory blocks for the nodes. By using this optimization, the overall performance of the XML parsing process can be improved.

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5.

Which string function converts a string of ASCII characters to hexadecimal values?

Addcslashes()
Addslashes()
Convert_cyr_string()
Bin2hex()

Correct Answer

A. Bin2hex()

Explanation

The bin2hex() function is the correct answer because it converts a string of ASCII characters to hexadecimal values. This function takes a string as input and returns the hexadecimal representation of the input string. It converts each character in the string to its corresponding hexadecimal value.

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6.

What does libxml_clear_errors() do?

Retrieve array of errors
Retrieve last error from libxml
Remove blank nodes
Clear libxml error buffer

Correct Answer

A. Clear libxml error buffer

Explanation

The function libxml_clear_errors() is used to clear the error buffer in the libxml library. This means that it removes any previously recorded errors or messages, allowing for a fresh start in error handling. This can be useful when wanting to handle errors in a specific way or when needing to reset the error state before performing new operations with the libxml library.

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7.

What is the best practice for running MySQL queries in pHP?

Use mysql_query() and string escaped variables
Use mysql_query() and variables with a blacklisting check
Use PDO prepared statements and parameterized queries
Use mysql_query() and variables

Correct Answer

A. Use PDO prepared statements and parameterized queries

Explanation

The best practice for running MySQL queries in PHP is to use PDO prepared statements and parameterized queries. This approach helps to prevent SQL injection attacks by separating the SQL code from the user input. PDO (PHP Data Objects) is a PHP extension that provides a consistent interface for accessing databases, and prepared statements allow for the use of placeholders in the SQL code that can be later bound to specific values, ensuring proper data sanitization and security. This method is recommended over using the deprecated mysql_query() function and string escaped or blacklisted variables.

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8.

Which of the following will check if a function exists?

Has_function()
None of these
Function_exists()
$a = “function to check”; if ($a ()) // then function exists

Correct Answer

A. Function_exists()

Explanation

The function_exists() function is used to check if a function exists in PHP. It takes the name of the function as a parameter and returns true if the function exists, and false otherwise. In the given options, has_function() and None of these are not valid functions in PHP. The statement "$a = “function to check”; if ($a ()) // then function exists" is not a valid way to check if a function exists, as it is trying to call a function using a string variable, which will result in a fatal error. Therefore, the correct answer is function_exists().

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9.

What is the best way to send an email using the variables $to, $subject, and $body?

Sendmail(to,subject,body)
Mail(to,subject,body)
Sendmail($to,$subject,$body)
Mail($to,$subject,$body)

Correct Answer

A. Mail($to,$subject,$body)

Explanation

The best way to send an email using the variables $to, $subject, and $body is to use the function mail($to, $subject, $body). This function takes the recipient's email address, the subject of the email, and the body of the email as parameters. By passing the variables $to, $subject, and $body as arguments to the mail() function, the email will be sent to the specified recipient with the given subject and body content.

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10.

Which filesystem function returns a character from an open file?

Fgetcsv()
Fgets()
Fgetss()
Fgetcsv()

Correct Answer

A. Fgetcsv()

Explanation

The correct answer is fgets(). The fgets() function is used to read a line from an open file and returns it as a string. It reads up to the specified number of characters or until it reaches the end of the line. The fgetcsv() function, on the other hand, is used to read a line from an open file and parse it as CSV data, returning an array of values. Therefore, fgets() is the appropriate function to use when you want to read a character from an open file.

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PHP Web Developer Assessment Test

Which string function(s) converts Hebrew text to visual text?

Quiz Preview

Which is used for one-way string hashing?

What is the difference between Unix and Windows platforms when specifying a path?

Which constant set small nodes allocation optimization?

Which string function converts a string of ASCII characters to hexadecimal values?

What does libxml_clear_errors() do?

What is the best practice for running MySQL queries in pHP?

Which of the following will check if a function exists?

What is the best way to send an email using the variables $to, $subject, and $body?

Which filesystem function returns a character from an open file?