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Questions and Answers
In PHP, a local variable defined inside a function can be accessed from outside the function.
False
The '%' operator is used to perform exponentiation in PHP.
False
Assignment operators in PHP are used to perform arithmetic operations.
False
In PHP, global variables can be accessed from anywhere in the script.
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The '==' operator is used to perform assignment in PHP.
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The '+' operator is used to perform subtraction in PHP.
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In PHP, variables do not have a specific data type, they can store any type of value.
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The PHP operator precedence table provides a comprehensive guide to understanding how operators behave in expressions.
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In PHP, functions can modify global variables without using the global keyword.
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The W3Schools PHP Operators Tutorial provides a comprehensive guide to understanding operator precedence in PHP.
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PHP has a built-in data type for storing boolean values.
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The PHP manual provides detailed information on control structures, such as if-else statements and loops.
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In PHP, the === operator checks if two values are equal, but not necessarily of the same data type.
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The logical NOT operator in PHP is denoted by the symbol ||.
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In PHP, a constant can be defined using the define() function and can be changed later in the script.
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The conditional operator in PHP is a shorthand way to write an if-else statement.
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In PHP, a function can be defined inside another function.
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The . operator is used to concatenate strings in PHP.
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Study Notes
Variables and Constants
- Variables can be accessed from anywhere in the script, but constants are always global and can be accessed from anywhere in the script.
- Local variables are defined within a function and cannot be accessed outside of that function.
- Global variables can be accessed from anywhere in the script.
Operators
- Arithmetic operators:
- Addition: +
- Subtraction: -
- Multiplication: *
- Division: /
- Modulus (Remainder): %
- Increment: ++
- Decrement: --
- Assignment operators:
- Assignment: =
- Addition Assignment: +=
- Subtraction Assignment: -=
- Multiplication Assignment: *=
- Division Assignment: /=
- Modulus Assignment: %=
Comparison Operators
- Equal to: ==
- Identical to (value and type): ===
- Not equal to: !=
- Not identical to (value or type): !==
- Greater than: >
- Less than: <
- Greater than or equal to: >=
- Less than or equal to: <=
Logical Operators
- Logical AND: && or and
- Logical OR: || or or
- Logical NOT: ! or not
String Operators
- Concatenation: .
- Example:
$name = "John"; $greeting = "Hello, ".$name."!";
Conditional Operator (Ternary)
- Format:
condition ? expr1 : expr2 - Example:
$age = 20; $status = ($age >= 18) ? "Adult" : "Minor";
Exercises
- Declare a variable and assign it a value, then print its value.
- Define a constant and print its value.
- Create a function that takes two parameters and returns their sum, then test the function with different arguments.
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Description
Learn about the scope and usage of variables and operators in PHP programming. Understand the difference between global and local variables and how to use operators in your PHP scripts.
