SynapseIndia PHP Fuction Development

8/10/2019 SynapseIndia PHP Fuction Development

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50 $userVerified = 0;

51

52 // read each line in file and check username

53 // and password

54 while ( feof( $file ) && $userVerified ) {

55

56// read line from file

57$line = fgets( $file, 255);

58

59 // remove newline character from end of line

60 $line = chop( $line );

61

62 // split username and password

63 $field = split( ",", $line, 2);

64

65// verify username

66if( $USERNAME == $field[ 0] ) {

67 $userVerified = 1;

68

69// call function checkPassword to verify

70 users password

71if( checkPassword( $PASSWORD, $field )

72== true)

73 accessGranted( $USERNAME );

74 else

75 wrongPassword();

password.php

(3 of 7)

Before entering the whileloop, variable

$userVerifiedis set to 0.

The whileloop executes as long as the there are morelines in the file to read and variable $userVerifiedis

still 0or empty.

Function fgetsreads a line from the text file.

The result is assigned to variable $line.

Function chopremoves the newline character

from the end of the line.

Function splitis called to separate the string at the

specified delimiter (in this case, a comma). The

resulting array is stored in array $field.

The username entered by the user is tested

against the one returned in the text file (stored

in the first element of the array). If they match,

variable $userVerifiedis set to 1.

Function checkPasswordis called to verify the

users password. Variable $PASSWORDand array

$fieldare passed to the function.

If function checkPasswordreturns true, function

accessGrantedis called to notify the client thatpermission has been granted. Otherwise, function

wrongPasswordis called.


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76}

77 }

78

79 // close text file

80 fclose( $file );

81

82// call function accessDenied if username has

83// not been verified

84 if( $userVerified )

85accessDenied();

86 }

87

88 // verify user password and return a boolean

89 functioncheckPassword( $userpassword, $filedata )

90{

91 if( $userpassword == $filedata[ 1] )

92returntrue;

93 else

94 returnfalse;

95 }

96

password.php

(4 of 7)

After the whileloop has executed, function

fcloseis called to close the file.

If variable $userVerifiedhas not been set to a

value other than 0, function accessDeniedis

called to notify the client that access has been

denied.

Function checkPasswordcompares the users

password to the password in the file. If they match,

trueis returned, whereas falseis returned if they

do not.


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97 // print a message indicating the user has been added

98 functionuserAdded( $name )

99 {

100 print( "Thank You

101

103 You have been added

104 to the user list, $name.

105
Enjoy the site.");

106 }

107

108 // print a message indicating permission

109 // has been granted

110functionaccessGranted( $name )

111 {

112 print( "Thank You

113

115 Permission has been

116 granted, $name.

117 Enjoy the site.");

118 }

119

password.php

(5 of 7)Function userAddedprints a message to the

client indicating that the user has been added.

Function accessGrantedprints a

message to the client indicating that

permission has been granted.


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120 // print a message indicating password is invalid

121functionwrongPassword()

122{

123print( "Access Denied

124

126 You entered an invalid

127 password.
Access has

128 been denied.");

129 }

130

131 // print a message indicating access has been denied

132 functionaccessDenied()

133{

134print( "Access Denied

135

137

138 You were denied access to this server.

139
" );

140 }

141

password.php

(6 of 7)

Function wrongPasswordprints a message to the

client indicating that the password is invalid.

Function accessDeniedprints a message to the

client indicating that access has been denied.


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142 // print a message indicating that fields

143// have been left blank

144 functionfieldsBlank()

145{

146 print( Access Denied

147

149

150 Please fill in all form fields.

151
);

152 }

153 ?>

154

155

password.php

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Function fieldsBlankprints a message to the

client indicating that all form fields have not been

completed.


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26.6 Verifying a Username and

PasswordFig. 26.16 Verifying a username and password.


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password.txt

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1account1 password1

2account2 password2

3account3 password3

4account4 password4

5account5 password5

6account6 password6

7account7 password7

8account8 password8

9account9 password9

10account10 password10


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26.7 Connecting to a Database

Databases Store and maintain data

MySQL is a free database product

PHP supports many database operations Access databases from Web pages

1


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1< DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

2"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

3

4 < -- Fig. 26.18: data.html -->

5 < -- Querying a MySQL Database -->

6

7

8

9 Sample Database Query

10

11

12

13

14Querying a MySQL database.

15

16

17

18

Select a field to display:

19

20< -- add a select box containing options -->

21 < -- for SELECT query -->

data.html

(1 of 2)

22


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22

23 *

24 ID

25 Title

26 Category

27 ISBN

28

29

30

31

34

35

36

data.html

(2 of 2)

Select box containing options for a SELECT

query.


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26.7 Connecting to a DatabaseFig. 26.18 Form to query a MySQL database.


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26.7 Connecting to a Database

Interacting with databases SQL

Structured Query Language

Used to manipulate databases

Several useful functionsmysql_connect

mysql_select_db

mysql_query

mysql_errormysql_fetch_row

mysql_close

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SynapseIndia PHP Fuction Development