Getting a parse error when comparing strings.

Need help in thus script. Trying to create the script that uses comparison operators and functions to compare two strings entered by user. When I add in the info in the script section everything falls apart.

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"

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

<html xmlns="http://www.w3.org/1999/xhtml">
 
<head>

<title>Compare Strings</title>
 
</head>
 
<body>
 
<h1>Compare Strings</h1><hr />

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<?php
 
if (isset($_GET['first_string'] && isset($_GET['second_string'])) {

    $FirstString = $_GET['first_string'];

    $SecondString = $_GET['second_string'];
 
    if (FirstString == $SecondString)

        echo "<p>Both Strings are the same</p>";

    else {

    echo "<p>Both have "

        . similar_text($FirstString, $SecondString)

        . " character(s) in common.<br />";

    echo "<p>You must change " . levenshtein($FirstString, $SecondString) ."

    character(s) to make the strings the same.<br />";
 
    }

}

    else

        echo "<p>Enter two strings you want to compare.</p>";
 
?>

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<form action="CompareStrings.php" method="get" enctype="application/x-www-form-urlencoded">

<p>First String <input type="text" name="first_string" size="20" value="<?php if 
 
(!empty($_GET['first_string'])) echo $_GET['first_string'] ?>" /></p>
 
<p>Second String <input type="text" name="second_string" size="20" value="<?php if 
 
(!empty($_GET['second_string'])) echo $_GET['second_string'] ?>" /></p>
 
<p><input type="submit" value="Compare Strings" />
 
</form><hr />
 
</body>

</html>

Oct 1 '07 #1

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4089

code green

1,726

Expert 1GB

When I add in the info in the script section everything falls apart.

Thanks for this excellent detailed analysis.
Never mind. Check this line [PHP]if (FirstString == $SecondString)
echo "<p>Both Strings are the same</p>";[/PHP]

Oct 1 '07 #2

cutlass

Oh after fixing the spelling error.The error that I have recieved in the beginning is:

Parse error: syntax error, unexpected T_BOOLEAN_AND, expecting ',' or ')'

The form action info works fine without the script info, but when I place in the script that is when I get all kinds of errors.

Oct 1 '07 #3

code green

1,726

Expert 1GB

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 Parse error: syntax error, unexpected T_BOOLEAN_AND, expecting ',' or ')' 
 

This is followed by the line where the error occured.
And what does this line look like?
If you cannot raise the effort to supply us with accurate info you surely can't expect people to proof read your code.

Oct 1 '07 #4

cutlass

Sorry about that - I'm new to PHP and really lost. Here is my info again with line numbers. error is:

Parse error: syntax error, unexpected T_BOOLEAN_AND, expecting ',' or ')' in C:\wamp\www\CSCI 230\Chapter5\CompareStrings.php on line 19

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

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

3  <html xmlns="http://www.w3.org/1999/xhtml">

4

5

6

7  <head>

8  <title>Compare Strings</title>

9 

10  </head>

11

12  <body>

13

14  <h1>Compare Strings</h1><hr />

15

16

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17  <?php

18

19  if (isset($_GET['first_string'] && isset($_GET['second_string'])) {

20    $FirstString = $_GET['first_string'];

22    $SecondString = $_GET['second_string'];

23

24

25    if ($FirstString == $SecondString)

26        echo "<p>Both Strings are the same</p>";

27    else {

28    echo "<p>Both have "

29        . similar_text($FirstString, $SecondString)

30        . " character(s) in common.<br />";

31    echo "<p>You must change " . levenshtein($FirstString, $SecondString) ."

32    character(s) to make the strings the same.<br />";

33

34    }

35  }

36    else

37        echo "<p>Enter two strings you want to compare.</p>";

38 

39  ?>

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40

41  <form action="CompareStrings.php" method="get" enctype="application/x-www-form-urlencoded">

42  <p>First String <input type="text" name="first_string" size="20" value="<?php if 
 
43  (!empty($_GET['first_string'])) echo $_GET['first_string'] ?>" /></p>

44

45  <p>Second String <input type="text" name="second_string" size="20" value="<?php if 
 
46  (!empty($_GET['second_string'])) echo $_GET['second_string'] ?>" /></p>

47

48  <p><input type="submit" value="Compare Strings" />

49

50

51  </form><hr />

52

53  </body>

54  </html>

When I validate it in HTML Validation I get:

Errors and Warnings
Line 41, character 73:
... rst_string" size="20" value="<?php if (!empty($_GET['first_s ...
^Warning: character < is the first character of a delimiter but occurred as data

Line 43, character 75:
... ond_string" size="20" value="<?php if (!empty($_GET['second_ ...
^Warning: character < is the first character of a delimiter but occurred as data

Line 48, character 7:
</form><hr />
^Error: end tag for p omitted; end tags are required in XML for non-empty elements; empty elements require an end tag or the start tag must end with />

Line 45, character 1:
<p><input type="submit" value="Compare Strings" />
^start tag was here

Oct 1 '07 #5

code green

1,726

Expert 1GB

You are missing a bracket on this line.
[PHP]if (isset($_GET['first_string'] && isset($_GET['second_string'])) {[/PHP]
It is easily done.Should be this [PHP]if (isset($_GET['first_string']) && isset($_GET['second_string'])) {[/PHP] But be aware that PHP can behave differently to C when using double conditional statements.
If you ever get strange behaviour wrap each condition in another set of brackets like this [PHP]if ((isset($_GET['first_string'])) && (isset($_GET['second_string']))) {[/PHP]But you should be alright this time

Oct 2 '07 #6

pbmods

5,821

Expert 4TB

Heya, Cutlass.

Changed thread title to better describe the problem (did you know that threads whose titles do not follow the Posting Guidelines actually get FEWER responses?).

Please use CODE tags when posting source code:

[CODE=php]
PHP code goes here.
[/CODE]

Oct 14 '07 #7

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