PHP Syntax and Variables
Can a variable name start with a number?
no
Is php case sensitive?
no
Name the 8 types of data types?
Integers, doubles, Boolean, Null, strings, arrays, objects and resources
&& concept
Is only concerned if the first part of comparison is true Once the system knows the answer it will evaluate whether to stop or continue the program
What is the default value of a variable?
It is 0
What type of language is PHP?
It's a scripting language
How is PHP code executed?
It's executed on a web server
What are the three different variable scopes?
Local, Global, Static
Who can edit the php.ini type of file?
The system administrators
What is the purpose of phpinfo()?
This tag will show how PHP is configured, version information, and the settings of all environment variables
Define ===
True if arguments are equal and the same data type
Define !==
True if arguments are not equal or they are not of the same data type
Define xor
True if either (but not both) of its arguments are true
How do I define a constant?
Using define ()
How to begin a variable?
With a $ (dollar sign) as well as a letter or underscore
What is a comment?
a line of code that is not read/executed as part of the program
What do PHP statements end with?
a semicolon (;)
Global Scope
a variable is declared outside a function and can only be accessed outside a function
Local Scope
a variable is declared within a function and can only be accessed inside a function
Global Keyword
used to access a global variable from within a function must be used before the variables inside the functions
Static
used when a variable needs to be reused and not deleted
How would you assign the value ' Hello ' to the letter x?
$x = "Hello"
Name the 3 types of logical operators
(&&)....,(||)....,(!)
Name the five arithmetic operators
(+)...,(-)...,(*)...,(/)...,(%)
What is string concatenation?
(.=), takes two strings and places them together
Name 8 assignment operators
(=) ....., (+=)......, (-=).......,( /=)....., (*=) .....,(%=).......,(++)......, (- -)
Name the 5 comparison operators
(==)....,(!=)....,(< >)....,(<=)....,(>=)
What are the two types of PHP tags that PHP code should be placed between?
,> code ?> And <?php code ?>
T or F: <> and != are the same
T
T or F: Variables do not have to be declared nor do data types?
T
T or F: a variable name must start with a letter or the underscore character?
T
7 essential programming concepts
- variables and types, computation and logic, input/output, selection, repetition, data aggregation, code aggregation
How to begin a multiple line comment block
/* and */
Two symbols to begin a single line comment
// and #
Name the three legal commenting styles for php?
// single line comment # perl style single line comment /* multiple line comments */
What is the difference between 2 comparisons vs 3 comparisons
3 comparisons are concerned about data types while 2 comparisons are not concerned about types
What does a PHP script begin with?
<?php
Write hello world program?
<html> <head> <title>Hello World </title> </head> <body> <?php $name = "World"; Echo "<h1> Hello, $name! </h1>"; ?> </body> </html>
What does a PHP script end with?
?>
T or F: PHP is compiled instead of interpreted
F : PHP gets interpreted instead of being compiled
T or F: and/ or are the same as && and || but with higher precedent
F: and/or are the same as (&&) and (||) but with lower precedent
PHP and Data Type conversion
PHP automatically converts the variable to the correct data type, depending on its value
What is the main I configuration for php?
PHP.ini
