PHP facts & stats

Question 1

In PHP, variable names begin with which symbol?

Accepted Answer

$. PHP variables always start with a dollar sign, as in $name.

Question 2

Which tag opens a block of PHP code in a file?

Accepted Answer

<?php. PHP code begins with <?php and can end with ?>.

Question 3

Which PHP operator checks that two values are equal AND of the same type?

Accepted Answer

===. === is the identical operator: both value and type must match, unlike the looser ==.

Question 4

In PHP, which operator accesses a property or method of an object?

Accepted Answer

->. The arrow -> reaches an object's members, as in $user->name; => pairs keys and values in arrays.

Question 5

Which built-in PHP function returns the length of a string?

Accepted Answer

strlen(). strlen() returns the number of bytes in a string; count() is for arrays.

Question 6

PHP's scope resolution operator '::' is also called what, from the Hebrew for 'double colon'?

Accepted Answer

Paamayim Nekudotayim. The Hebrew name Paamayim Nekudotayim means 'double colon' and has even appeared in PHP error messages.

Question 7

Which PHP operator returns its left operand if it exists and is not null, otherwise the right one?

Accepted Answer

??. The null coalescing operator ?? is a short way to supply a default when a value is unset or null.

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