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Questions and Answers
A constructor is used to initialize an object's properties upon creation.
A constructor is used to initialize an object's properties upon creation.
True
When creating a constructor function in PHP, it must start with three underscores.
When creating a constructor function in PHP, it must start with three underscores.
False
A destructor function in PHP is automatically called when an object is created from a class.
A destructor function in PHP is automatically called when an object is created from a class.
False
Using a constructor in PHP eliminates the need to manually call the initialization method.
Using a constructor in PHP eliminates the need to manually call the initialization method.
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A destructor function in PHP starts with a single underscore (__).
A destructor function in PHP starts with a single underscore (__).
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The new keyword is used to create objects of a class in PHP.
The new keyword is used to create objects of a class in PHP.
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A destructor function in PHP is automatically called at the beginning of the script execution.
A destructor function in PHP is automatically called at the beginning of the script execution.
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In PHP, a constructor is defined with the name __construct().
In PHP, a constructor is defined with the name __construct().
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Creating objects using a class in PHP requires the use of the create keyword.
Creating objects using a class in PHP requires the use of the create keyword.
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A constructor function in PHP automatically initializes object properties.
A constructor function in PHP automatically initializes object properties.
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Study Notes
Properties in PHP
- Properties are created with an initial $ and the name of the property, which can include alphabetic characters, numbers, and the _.
- Properties can hold many different types of data.
- PHP determines the type of data to be stored in a property the first time data is placed in the property.
- Properties are also called variables and include characteristics of the class.
Classes in PHP
- Class names cannot include spaces, but the _ is permitted and commonly used to connect two words together.
- Classes are templates for objects, and each object has all the properties and methods defined in the class, but with different property values.
Methods in PHP
- Methods are declared using the keyword function followed by a method name and ().
- Methods are created in a similar style as classes, except they are actually contained within the classes.
- Method names can include lowercase letters, uppercase letters, and the _.
- All code within a method is contained within {}.
Objects in PHP
- Objects are created using the new keyword.
- Multiple objects can be created from a class, each with unique property values.
$this Keyword
- The $this keyword refers to the current Class / object, and is only available inside methods.
Constructor and Destructor
- The __construct() function is called when an object is created, allowing initialization of an object's properties.
- The __destruct() function is called when the object is destructed or the script is stopped or exited.
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Description
Learn about how properties are created in PHP, including the use of underscore, rules for lowercase and uppercase letters, and the case sensitivity of PHP. Explore the nuances of defining properties in PHP.
