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Questions and Answers
Which keyword is used to begin a user-defined function declaration in PHP?
Which keyword is used to begin a user-defined function declaration in PHP?
- method
- define
- function (correct)
- subroutine
In PHP, function names are case-sensitive.
In PHP, function names are case-sensitive.
False (B)
How do you call or execute a function in PHP?
How do you call or execute a function in PHP?
Write the function's name followed by parentheses.
Arguments passed to a PHP function are specified inside the __________.
Arguments passed to a PHP function are specified inside the __________.
What does the opening curly brace { indicate in a PHP function?
What does the opening curly brace { indicate in a PHP function?
A PHP function will automatically execute when a page loads.
A PHP function will automatically execute when a page loads.
What is the purpose of arguments in a PHP function?
What is the purpose of arguments in a PHP function?
To let a function return a value, use the __________ statement.
To let a function return a value, use the __________ statement.
In PHP, what happens when a function argument is passed by value?
In PHP, what happens when a function argument is passed by value?
You can only pass one argument to a PHP function.
You can only pass one argument to a PHP function.
How do you specify a default value for a function argument in PHP?
How do you specify a default value for a function argument in PHP?
In PHP, to pass an argument by reference, you must use the __________ operator before the variable name in the function definition.
In PHP, to pass an argument by reference, you must use the __________ operator before the variable name in the function definition.
What will be the output of the following PHP code snippet?
function add_five(&$value) { $value += 5; } $num = 2; add_five($num); echo $num;
What will be the output of the following PHP code snippet?
function add_five(&$value) { $value += 5; } $num = 2; add_five($num); echo $num;
The function name must start with an integer.
The function name must start with an integer.
Match the following code with their functionality:
Match the following code with their functionality:
Flashcards
What is a function?
What is a function?
A block of statements that can be used repeatedly.
Creating a Function
Creating a Function
A user-defined function declaration starts with the keyword function, followed by the function's name.
How to call a function?
How to call a function?
Write its name followed by parentheses ().
Function Arguments
Function Arguments
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Specifying Arguments
Specifying Arguments
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Default Argument Value
Default Argument Value
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Returning a Value
Returning a Value
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Passing by Value
Passing by Value
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Passing by Reference
Passing by Reference
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Study Notes
PHP Functions
- A function is a block of statements for repeated use in a program.
- Functions do not automatically execute when a page loads, but are executed when called.
Creating Functions
- User-defined function declarations start with the keyword
function, followed by the function name. - Function names must begin with a letter or an underscore.
- Function names are not case-sensitive.
Calling Functions
- Call a function by writing its name followed by parentheses
(). - The opening curly brace
{indicates the start of the function code. - The closing curly brace
}indicates the end of a function.
Function Arguments
- Arguments pass information to functions, functioning like variables.
- Arguments are specified inside the parentheses after the function name, separated by commas.
Default Argument Value
- A default parameter is used when a function is called without arguments.
- If
setHeight()is called without arguments, it takes the default value as the argument.
Returning Values
- To return a value from a function, the
returnstatement is used.
Passing Arguments by Reference
- Arguments are usually passed by value, meaning a copy of the value is used and the original variable cannot be altered.
- When an argument is passed by reference, changes to the argument also affect the original variable.
- To pass an argument by reference, the
&operator is used.
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