Lesson 2 php data types

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This document provides an overview of different PHP data types including strings, integers, floats, booleans, arrays, objects, NULL, and resources. It describes each data type, provides examples, and explains what each can store and how they are different. The document also introduces some common PHP string functions like strlen(), str_word_count(), strrev(), strpos(), and str_replace() and provides brief descriptions of what each function does.

Welcome to Computer
Programmer 2
PHP Language – Lesson 2 Prepared By:
Analyn G. Regaton

PHP Data Types
Variables can store data of different types, and different data types can do different
things.
PHP supports the following data types:
•String
•Integer
•Float (floating point numbers - also called double)
•Boolean
•Array
•Object
•NULL
•Resource

PHP String
A string is a sequence of characters, like "Hello world!".
A string can be any text inside quotes. You can use single or double quotes:

PHP Integer
An integer data type is a non-decimal number between -2,147,483,648 and
2,147,483,647.
Rules for integers:
•An integer must have at least one digit
•An integer must not have a decimal point
•An integer can be either positive or negative
•Integers can be specified in: decimal (base 10), hexadecimal (base 16), octal (base 8), or
binary (base 2) notation
In the following example $x is an integer. The PHP var_dump() function returns the data
type and value:

PHP Float
A float (floating point number) is a number with a decimal point or a number in exponential form.
In the following example $x is a float. The PHP var_dump() function returns the data type and
value:

PHP Boolean
A Boolean represents two possible states: TRUE or FALSE.
$x = true;
$y = false;
Booleans are often used in conditional testing. You will learn more about conditional testing
in a later chapter of this tutorial.

PHP Array
An array stores multiple values in one single variable.
In the following example $cars is an array. The PHP var_dump() function returns the data
type and value:

PHP Object
An object is a data type which stores data and information on how to process that data.
In PHP, an object must be explicitly declared.
First we must declare a class of object. For this, we use the class keyword. A class is a
structure that can contain properties and methods:

PHP NULL Value
Null is a special data type which can have only one value: NULL.
A variable of data type NULL is a variable that has no value assigned to it.
Tip: If a variable is created without a value, it is automatically assigned a value of NULL.
Variables can also be emptied by setting the value to NULL:

PHP Resource
The special resource type is not an actual data type. It is the storing of a reference to
functions and resources external to PHP.
A common example of using the resource data type is a database call.
We will not talk about the resource type here, since it is an advanced topic.

PHP String Functions
strlen() - Return the Length of a String
The PHP strlen() function returns the length of a string.
In this chapter we will look at some commonly used functions to manipulate strings.

PHP String Functions
str_word_count() - Count Words in a String
The PHP str_word_count() function counts the number of words in a string.

PHP String Functions
strrev() - Reverse a String
The PHP strrev() function reverses a string.

PHP String Functions
strpos() - Search For a Text Within a String
The PHP strpos() function searches for a specific text within a string. If a match is found, the
function returns the character position of the first match. If no match is found, it will return
FALSE.

PHP String Functions
str_replace() - Replace Text Within a String
The PHP str_replace() function replaces some characters with some other characters in a string.

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This document discusses common computer errors, including hardware errors like blank monitors, hard drive failures, and faulty keyboards or mice. It also covers software errors such as access denied, file not found, and out of memory issues. Specific error types like disk read errors, boot failures, freezing, and the blue screen of death are explained in more detail. The document emphasizes the importance of properly diagnosing errors to identify whether the issue is hardware or software related.

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Bootable media contains software that allows a computer to boot from a removable device like a USB flash drive. When booting, the computer performs self-checks, loads the BIOS which finds the boot loader on the hard drive, and then loads the operating system along with hardware drivers and any startup programs. Bootable USB flash drives provide an easy way to install operating systems without discs by creating a portable boot device.

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Computer troubleshooting is a systematic process used to locate the cause of faults in computer systems and resolve hardware and software issues. It involves following a logical process with steps like identifying the problem, establishing a probable cause, testing theories to determine the cause, developing a solution plan, verifying the system works, and documenting findings. Troubleshooting skills are developed over time through experience solving different problems. Common computer issues include failures of storage devices, motherboards, power supplies, CPUs, memory, displays, and more. Solutions may involve checking connections, updating drivers or BIOS, replacing faulty components, and ensuring proper cooling and power.

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Lesson 2 php data types

1. Welcome to Computer Programmer 2 PHP Language – Lesson 2 Prepared By: Analyn G. Regaton

2. PHP Data Types Variables can store data of different types, and different data types can do different things. PHP supports the following data types: •String •Integer •Float (floating point numbers - also called double) •Boolean •Array •Object •NULL •Resource

3. PHP String A string is a sequence of characters, like "Hello world!". A string can be any text inside quotes. You can use single or double quotes:

4. PHP Integer An integer data type is a non-decimal number between -2,147,483,648 and 2,147,483,647. Rules for integers: •An integer must have at least one digit •An integer must not have a decimal point •An integer can be either positive or negative •Integers can be specified in: decimal (base 10), hexadecimal (base 16), octal (base 8), or binary (base 2) notation In the following example $x is an integer. The PHP var_dump() function returns the data type and value:

5. PHP Float A float (floating point number) is a number with a decimal point or a number in exponential form. In the following example $x is a float. The PHP var_dump() function returns the data type and value:

6. PHP Boolean A Boolean represents two possible states: TRUE or FALSE. $x = true; $y = false; Booleans are often used in conditional testing. You will learn more about conditional testing in a later chapter of this tutorial.

7. PHP Array An array stores multiple values in one single variable. In the following example $cars is an array. The PHP var_dump() function returns the data type and value:

8. PHP Object An object is a data type which stores data and information on how to process that data. In PHP, an object must be explicitly declared. First we must declare a class of object. For this, we use the class keyword. A class is a structure that can contain properties and methods:

9. PHP NULL Value Null is a special data type which can have only one value: NULL. A variable of data type NULL is a variable that has no value assigned to it. Tip: If a variable is created without a value, it is automatically assigned a value of NULL. Variables can also be emptied by setting the value to NULL:

10. PHP Resource The special resource type is not an actual data type. It is the storing of a reference to functions and resources external to PHP. A common example of using the resource data type is a database call. We will not talk about the resource type here, since it is an advanced topic.

11. PHP String Functions strlen() - Return the Length of a String The PHP strlen() function returns the length of a string. In this chapter we will look at some commonly used functions to manipulate strings.

12. PHP String Functions str_word_count() - Count Words in a String The PHP str_word_count() function counts the number of words in a string.

13. PHP String Functions strrev() - Reverse a String The PHP strrev() function reverses a string.

14. PHP String Functions strpos() - Search For a Text Within a String The PHP strpos() function searches for a specific text within a string. If a match is found, the function returns the character position of the first match. If no match is found, it will return FALSE.

15. PHP String Functions strpos() - Search For a Text Within a String The PHP strpos() function searches for a specific text within a string. If a match is found, the function returns the character position of the first match. If no match is found, it will return FALSE. Tip: The first character position in a string is 0 (not 1).

16. PHP String Functions str_replace() - Replace Text Within a String The PHP str_replace() function replaces some characters with some other characters in a string.

17. The end !

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