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Predefined Functions Functi on Paramet er Returns floor Double Largest integer less than or equal to the parameter ceil Double round Double Nearest integer srand Integer rand abs min Two numbers Integer or double Numbers Smallest Smallest integer greater than or equal to the parameter Initializes a random number generator with the parameter A pseudorandom number greater than the first parameter and smaller than the second Absolute value of the parameter max Numbers Largest 20
String Operations and Functions • The only operator is period(.) for catenation • String variables can be treated like arrays for access to individual characters • The position can be specified in braces (Ex) If $str has “apples”, $str{3} is the fourth (l) • Functions: • strlen, strcmp, strpos, substr, as in C • chop – remove whitespace from the right end • trim – remove whitespace from both ends • ltrim – remove whitespace from the left end • strtolower, strtoupper 21
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 and 12: PHP TYPES • Four scalar types •
Page 13 and 14: Variables • If you prefer to be i
Page 15 and 16: Example • Integer $var = 1234; $v
Page 17 and 18: Special character Special char. \n
Page 19: Arithmetic Operators and Expression
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

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