Introduction to PHP - What is PHP? Basic Syntax, Variables, Operators & Control Structures
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Presentation covering beginning PHP
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Introduction to PHP - What is PHP? Basic Syntax, Variables, Operators & Control Structures
- 1. Introduction to PHP Todd Barber IT Analyst III / University Webmaster Information Technology Services
- 10. Operator Precedence Associativity Operators Additional Information non-associative new new left [ array() non-associative ++ -- increment/decrement non-associative ~ - (int) (float) (string) (array) (object) @ types non-associative instanceof types right ! logical left * / % arithmetic left + - . arithmetic and string left << >> bitwise non-associative < <= > >= comparison non-associative == != === !== comparison left & bitwise and references left ^ bitwise left | bitwise left && logical left || logical left ? : ternary right = += -= *= /= .= %= &= |= ^= <<= >>= assignment left and logical left xor logical left or logical left , (comma) many uses
- 26. More switch <?php $i = 4; switch ($i) { case 0: case 1: case 2: case 3: echo “I is less than 4”; break; case 4: echo “I is equal to 4”; break; default: echo “I is greater than 4”; break; ?> Combining cases Omitting Breaks <?php $i = 4; switch ($i) { case 0: case 1: case 2: case 3: echo “I is less than 4”; case 4: echo “I is equal to 4”; default: echo “I is greater than 4”; ?>
Notes de l'éditeur
- Since everything is HTML embedded, must have a way of telling the server what is PHP and what is HTML. 1 and 2 are both always available, however number 1 is used most often. 3 and 4 are only available if enabled by the server administrator. Closing tag is optional. Lines of code must end in PHP.
- Don’t add scope until talking about functions b/c examples don’t make sense until then.
- Don’t add scope until talking about functions b/c examples don’t make sense until then.
- Form with 8 names and name1, name2, etc… and it gets submitted For loop 8 times: $temp_name = name$i echo $$temp_name // holds the actual value from the form. End of for
- String to number- if string starts with number or sign then it gets that value, if it starts with anything else it gets evaluated to zero.
- Two different variations of AND and OR because they have different precedence
- Point out that on single command if statements the curly braces are optional.
- for ($i=1;$i<=10;print $i++) More on for the expressions can be blank or have multiple expressions in them. Go to php.net for more