Creating PHP Pages

1
Creating PHP Pages

• Chapter 9
• PHP Strings

2
PHP Strings

• A string can be single-quoted or double-quoted.
• Or in heredoc syntax (creates a large text string
  without needing quotes, and can be used anyplace
  a string would go)
• ltltltDONE
• your_string_here
• DONE
• The string concatenation operator, .
• Several functions for string are available
• Manipulation with a regular expression,
• Conversion between a string and an array,
• Outputing by echo(), print(), printf(), and
  print_r(), and
• Others

3
Single-Quoted String

• No evaluation occurs for a single-quoted string.
• age 20
• echo I am name.\n
• echo Single
• echo \Double\
• echo Double
• echo age gt 18 ? OK
• Output
• I am age.\n
• (illegal operation)
• \Double\
• Double
• OK

4
Double-Quoted String

• Variables and escape sequences within a
  double-quoted string are evaluated or replaced.
• age 20
• echo I am name.\n
• echo Single\n
• echo \Double\\n
• echo Double
• echo age gt 18 ? OK
• Output
• I am 20.
• single
• Double
• (illegal operation)
• OK

5
String

• int strlen(string) returns the length of string.
• str Name'
• len strlen(str)
• echo len
• Output
• 4

6
String

• int strpos(string1, string2) returns the numeric
  position of string2 in string1.
• str My house.'
• position strpos(str, house)
• echo position
• Output
• 4

7
String

• int strpos(str1, str2 )
• Returns FALSE if str2 is not a substring of
  str1.
• Returns 0 if str2 is at the beginning of str1,
  so using (strpos(str1, str2) 0) could cause
  an unreliable result.
• if(strpos(str1, str2) 0) may be used.

8
Substring

• Returns the string present in string starting
  from location start until end of string.
• Basic syntax
• string substr(string, start)
• Example
• str My dog.
• str2 substr(str, 3)
• echo str2
• str3 substr(str1, 3, 2)
• echo str3
• Output
• dog.
• do

9
String

• array explode(delim, string) creates an array of
  the substrings in string, separated by delimiter.
• Example
• str My Sweet Home
• arr explode(" ", str)
• echo arr0\narr1\narr2\n
• Output
• My
• Sweet
• Home

10
String

• string implode(delim, array)creates a string out
  of the elements in array, connected by delimiter.
• Example
• arr array(One', Two, Three)
• string implode(', arr)
• echo string
• Output
• OneTwoThree
• There still many more example, you can learn it
  in php website.

11
References

• References
• Anonymous.(n.d.). Apache HTTP Server
  Documentation Version 2.2. Retrieved from
  http//httpd.apache.org/docs/2.2/.
• Achour, M., Betz, F. (n.d.), PHP Manual.
  Retrieved from http//www.php.net/download-docs.ph
  p.
• Anonymous. (n.d.). MySQL Reference Manual.
  Retrieved from http//downloads.mysql.com/docs/.
• Naramore, E., Gerner, J., Le Scouarnec, Y.,
  Stolz, J., Glass, M. K. (2005). Beginning PHP5,
  Apache, and MySQL Web Development. Indianapolis,
  IN Wiley Publishing, Inc.