Elance Advanced PHP test answers

What will be the output of the following code?

<?php
$a=”printf”;
$a(“hello”);
?>

• Hello
• Printf hello
• Printf
• Syntax error
• None of the above

Answer: hello

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What is the associativity of +=?

• Left
• Right
• It is non-associative

What is the initial value of a variable?

• 0
• “0”
• NULL
• Any value

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Will the trim function strip NULL bytes?

• Yes
• No

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What enctype is required for file uploads to work?

• Multipart/form-data
• Multipart
• File
• Application/octet-stream
• None of the above

What will be the output of the following code?

<?php
$a=3;
print ‘$a’;
?>

• 3
• $a
• Syntax error
• None of the above

What is the size limit of strings in php?

• 1024 bytes
• 100Mbytes
• 256Kbytes
• There is no limit (hardware limit)

What is the output of the following code?
<?php
echo 0500;
?>

• 100
• 500
• 0500
• 320
• None of the above

Can feof() be used with a file opened by fsockopen()?

• Yes
• No

What is “?:”?

• A logical operator
• A comparison operator
• A ternary operator
• A bitwise operator
• None of the above

Which statement will return true?

• Is_numeric(“200”)
• Is_numeric(“20,0”)
• Is_numeric(“$200”)
• Is_numeric(“.25e4”)
• None

Which function would you use to delete a file?

• Delete()
• Delete_file()
• Unlink()
• Fdelete()
• File_unlink()

What will be the output of the following code?

<?php
print null==NULL;
?>

• 1
• 0

What will be the output of the following code?

Is sizeof a function?

• Yes
• No

What will be the output of the following code?

<?php
$a=”Hello”;
if(md5($a)===md5($a))
print “True”;
else
print “False”;
?>

• True
• False

What is the output of the following code?

<?php
echo 0*500;
?>

• 500
• 0*500
• 0500
• 1280
• 320

What is the precedence between && and “and”?

• && is higher than “and”
• “and” is higher than &&
• They have the same precedence
• This operators don’t exist