to get the file

More documents

Recommendations

Info

Variables • There are no type declarations because of dynamic typing • The type of a variable is set every time it is assigned a value • An unassigned ( unbound ) variable has the value, NULL • A variable of NULL in the expression will be coerced to a value dictated by the context of the use (Ex) If a number, NULL is coerced to 0 If a string, NULL is coerced to the empty string • The unset function sets a variable to NULL • The IsSet function tests whether a variable is NULL (Ex) IsSet ( $fruit ) returns TRUE if $fruit has non-NULL value 12
Variables • If you prefer to be informed when an unbound variable is referenced, place the error_reporting(15) at the beginning of the script in the document file • The error_reporting function is used to change the error – reporting level of the PHP interpreter • The default error-reporting level is 7 • PHP has many predefined variables, including the environment variables of the host operating system • You can get a list of the predefined variables by calling phpinfo() in a script 13
Page 1 and 2: Lecture 6. PHP: Part 1 1
Page 3 and 4: Overview of PHP • PHP is a server
Page 5 and 6: Operation Overview Web browser Clie
Page 7 and 8: General Syntactic Characteristics
Page 9 and 10: General Syntactic Characteristics
Page 11: PHP TYPES • Four scalar types •
Page 15 and 16: Example • Integer $var = 1234; $v
Page 17 and 18: Special character Special char. \n
Page 19 and 20: Arithmetic Operators and Expression
Page 21 and 22: String Operations and Functions •
Page 23 and 24: Example $str = “Apples are good
Page 25 and 26: Scalar Type Conversions • Explici
Page 27 and 28: Output • echo function • If par
Page 29 and 30: Example today.php Welcom
Page 31 and 32: Control Statements • Selection st
Page 33 and 34: Example if ($day ==== “Saturday
Page 35 and 36: HTML/PHP document • HTML can be i
Page 38 and 39: Result Powers table Number Square R
Page 40: PHP in HTML • Using variable

to get the file

Create successful ePaper yourself

Delete template?

Save as template?