How To Protect Special Characters in Query String

Q

How To Protect Special Characters in Query String? - PHP Script Tips - Processing Web Forms

✍: FYIcenter.com

A

If you want to include special characters like spaces in the query string, you need to protect them by applying the urlencode() translation function. The script below shows how to use urlencode():

<?php
  print("<html>");
  print("<p>Please click the links below"
    ." to submit comments about FYICenter.com:</p>");
  $comment = 'I want to say: "It\'s a good site! :->"';
  $comment = urlencode($comment);
  print("<p>"
    ."<a href=\"processing_forms.php?name=Guest&comment=$comment\">"
    ."It's an excellent site!</a></p>");
  $comment = 'This visitor said: "It\'s an average site! :-("';
  $comment = urlencode($comment);
  print("<p>"
    .'<a href="/processing_forms.php?'.$comment.'">'
    ."It's an average site.</a></p>");
  print("</html>");
?>

If you copy this script as submit_comments.php to your Web server, and click the first link, you will get:

  query_string = name=Guest&comment=
    I+want+to+say%3A+%22It%27s+a+good+site%21+%3A-%3E%22
Number of values: 2
  name = Guest
  comment = I want to say: "It's a good site! :->"

If you click the second link, you will get:

  query_string 
    = This+visitor+said%3A+%22It%27s+an+average+site%21+%3A-%28%22
Number of values: 1
  This_visitor_said:_\"It\'s_an_average_site!_:-(\" =

Now you know that urlencode() all special characters into HEX numbers. To translate them back, you need to apply urldecode().

2007-04-22, 5403👍, 0💬

How To Remove White Spaces from the Beginning and/or the End of a String
How To Remove White Spaces from the Beginning and/or the End of a String? - PHP Script Tips - PHP Built-in Functions for Strings There are 4 PHP functions you can use remove white space characters from the beginning and/or the end of a string: trim() - Remove white space characters from the beginnin... 2007-04-22, 5151👍, 0💬

How To Remove Leading and Trailing Spaces from User Input Values
How To Remove Leading and Trailing Spaces from User Input Values? - PHP Script Tips - PHP Built-in Functions for Strings If you are taking input values from users with a Web form, users may enter extra spaces at the beginning and/or the end of the input values. You should always use the trim() funct... 2007-04-22, 4934👍, 0💬

How To Submit Values without a Form
How To Submit Values without a Form? - PHP Script Tips - Processing Web Forms If you know the values you want to submit, you can code the values in a hyper link at the end of the URL. The additional values provided at the end of a URL is called query string. There are two suggestions on how to use q... 2007-04-22, 4920👍, 0💬

How To Generate and Process a Form with the Same Script
How To Generate and Process a Form with the Same Script? - PHP Script Tips - Processing Web Forms In previous exercises, a Web form is generated by one script, and processed by another script. But you could write a single script to do both. You just need to remember to: Use same script name as the f... 2007-04-22, 4881👍, 0💬

How To Remove the New Line Character from the End of a Text Line
How To Remove the New Line Character from the End of a Text Line? - PHP Script Tips - PHP Built-in Functions for Strings If you are using fgets() to read a line from a text file, you may want to use the chop() function to remove the new line character from the end of the line as shown in this PHP sc... 2007-04-22, 4742👍, 0💬

How To Support Multiple Submit Buttons
How To Support Multiple Submit Buttons? - PHP Script Tips - Processing Web Forms Sometimes, you may need to give visitors multiple submit buttons on a single form to allow them to submit the form for different purposes. For example, when you show your customer a purchase order in a Web form, you may... 2007-04-22, 4726👍, 0💬

How To Support Multiple-Page Forms
How To Support Multiple-Page Forms? - PHP Script Tips - Processing Web Forms If you have a long form with a lots of fields, you may want to divide the fields into multiple groups and present multiple pages with one group of fields on one page. This makes the a long form more user-friendly. However, ... 2007-04-22, 4639👍, 0💬

How To Support Hidden Form Fields
How To Support Hidden Form Fields? - PHP Script Tips - Processing Web Forms Hidden fields are special fields in a form that are not shown on the Web page. But when the form is submitted, values specified in the hidden fields are also submitted to the Web server. A hidden field can be specified with ... 2007-04-22, 4638👍, 0💬

How To Get the Number of Characters in a String
How To Get the Number of Characters in a String? - PHP Script Tips - PHP Built-in Functions for Strings You can use the "strlen()" function to get the number of characters in a string. Here is a PHP script example of strlen(): <?php print(strlen('It\'s Friday!')); ?> This script will p... 2007-04-22, 4636👍, 0💬

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.