This slide covers the various data types available in PHP

1. Working with Text and
Numbers
Text
Numbers
Variables

2. TEXT
• Spend lot of time handling text
• Generates HTML and works with data in databases
• Slicing and dicing text means we can easily built the dynamic websites
• Pieces of text are called strings
• String can contain any characters( letters, numbers, spaces, tabs )
• String can even contain binary files such as image or sound

3. Defining text strings
• Simples way is to surround with single quotes(‘ ’)

5. • To print single quote inside single quote we need backslash
character()
• Also called as escape character

7. • Escape character can be escaped itself

9. • Only characters that get special treatment inside single quotes are
single quotes and backslash character

11. • Strings can also be defined with the help of double quotes but they
have more special characters

12. • String can also be defined with the help of here document

14. • To combine two strings period(.) is used

16. Manipulating Text
• Validation
• Input coming is as per our requirement or not
• Formating
• Change the look of the output

17. Validation
• trim()
• strlen()
• Comparing string with equality operator
• strcasecmp()

18. trim()
• Syntax:
• trim( string, charlist )
• Removes whitespaces and other pre-defined characters from left and
right of the string
• Related functions:
• ltrim( string, charlist )
• rtrim( string, charlist )

29. Formating

33. • strtoupper() - converts a string to uppercase
• strtolower() - converts a string to uppercase
• lcfirst() - converts the first character of a string to lowercase
• ucfirst() - converts the first character of a string to uppercase
• ucwords() - converts the first character of each word in a string to
uppercase

38. • The substr() function returns a part of a string.
• Syntax
• substr(string,start,length)
• A positive number - Start at a specified position in the string
• A negative number - Start at a specified position from the end of the
string
• 0 - Start at the first character in string

41. • The str_replace() function replaces some characters with some other
characters in a string.
• Syntax
• str_replace(find,replace,string)

44. Numbers
• Integers
• float

45. Arithmetic Operators
• *
• /
• %
• +
• -

48. Variables
• Holds the data in the program

50. Operating on variables

52. Combined assignment and addition

54. Combined assignment and concatenation

56. Incrementing and decrementing

58. Putting Variables inside string