1. Introduction to PHP Part 1
Chapter 1
Introduction to PHP
Part 1

2. strings.php Script 1.6 on page 19
ch01\strings.php

3. concat.php Script 1.7 on page 21
ch01\concat.php

4. numbers.php Script 1.8 on page 24
ch01\numbers.php

5. Arithmetic Operations
Operator
Meaning +
$c = $a + $b; -
$c = $a - $b; *
$c = $a * $b; /
$c = $a / $b; %
$c = $a % 10; ++
$a++; --
$a--; +=
$a+=$b; *=
$a*=2;
.= (strings)
$c = $a . $b;

6. number_format
number_format

7. constants.php Script 1.9 on page 27
ch01\constants.php

8. Code
Meaning \”
Double quotation mark \’
Single quotation mark \\
Backslash \n
Newline \r
Carriage return \t
Tab \$
Dollar sign

9. quotes.php Script 1.10 on page 30
ch01\quotes.php

10. Debugging Make sure you’re always running PHP scripts through a URL.
Know what version of PHP you’re running.

11. Debugging Make sure display_errors is on.
CTRL+F (Edit->Search) display_errors
Take a break!