Working with variables in PHP
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The document discusses working with variables in PHP including creating variables, variable naming conventions, variable types, strings, operators, and increment/decrement operations. Key points include: - Variables are created using a dollar sign followed by the name (e.g. $variableName) and can be assigned values. - Variable names are case-sensitive. - PHP uses weak/dynamic typing so variables can hold different data types. - Strings can be delimited by double or single quotes and escape characters can be used inside strings. - Operators like =, +, -, *, / can be used to assign values and perform math operations on variables.
Working with variables in PHP
- 2. email [email protected] customerDOB 3/9/92 imagePosition x : 20 y : 300 imagePosition 120000
- 4. CREATING VAERIABLES $year; $year = 2013; NULL year 2013
- 5. VARIABLE NAMES ARE CASE SENSITIVE $x = 200; $X = 200; x 200 X 200
- 6. email [email protected] customerDOB 3/9/92 imagePosition x : 20 y : 300 imagePosition 120000
- 7. WEAK TYPING $myVariable; myVariable $myVariable = 200; $myVariable = “Hello”; $myVariable = ‘Hello’; $myVariable = true; $myVariable = false; 200HellofalsetrueNULL
- 8. STRINGS echo “Hello, World!”; $message = “Hello, World!” echo $message;
- 9. WORKING WITH STRINGS $myString = “Double quotes work.”; $myString = ‘Single quotes work too.’; $myString = “ One or other. ’;
- 10. QUOTES INSIDE QUOTES $phrase= ‘ Don’t mix your quotes.’; $phrase = “ Don’t mix your quotes.”; $phrase = “He said “that’s fine,” and left.”; $phrase = “He said “that’s fine,” and left.”;
- 11. USING OPERATORS
- 13. ARTHIMETIC OPERATORS + - * / $a = 100; $b = 50; $a $b;=$result 150 +- 50 * 5000 / 2
- 14. OPERATOR PRECEDENCE $result = 5 + 5 * 10; 505 +55
- 15. OPERATOR PRECEDENCE $result = (5 + 5) * 10; * 1010100
- 16. ARTHIMETIC OPERATORS $score = $score + 10; $score += 10; += -= *= /=
- 17. INCREMENT / DECREMENT $a = $a + 1; $a += 1; $a++; $a = $a - 1; $a -= 1; $a--;