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The Ternary Operator
Sun, 02/15/2004 - 05:00 — onajeThe Ternary Operator
Conditional (Ternary) Operator (?:)
A ternary operator is an operator that requires three terms. Alternatively, this operator could be described as "trinary".
This is the basic syntax:
(expression1) ? (expression2) : (expression3);
(BOOLEAN EXPR ? VALUE-IF-TRUE : VALUE-IF-FALSE)
Returns one of two expressions depending on a condition.
If expression1 is true, expression2 is returned, else expression3 is returned
true ? exp2 : exp3 // exp2 returned
false ? exp2 : exp3 // exp3 returned
Arguments
test
Any Boolean expression.
- a boolean type
Fixing Warning: main(): stream does not support seeking
Thu, 09/18/2003 - 04:00 — onajeFixing "Warning: main(): stream does not support seeking"
PHP 4.3.? include/require bug
How do I bypass/get rid of the warning: main(): stream does not support seeking?
It looks like the 4.3 versions of PHP have reintroduced an old bug with include/require in regards to including files with URLs. I have sites with two different ISPs and both have upgraded their servers in the past few weeks (without any warning) and this has caused me problems on both sites.
You will see the following warning message:
Warning: main(): stream does not support seeking
Intelligent/Smart Favorites in IE
Mon, 08/11/2003 - 04:00 — onajeIntelligent/Smart Favorites in IE
Turning on the Smart/Intelligent Favorites Menu in Internet Explorer 5.x/6
PHP Sessions
Tue, 08/05/2003 - 04:00 — onajeSession allows you to preserve data across page requests (going from one page to another on a website) by saving the data to variables that you register as being part of a session. Sessions are tracked through
cookies or through the URL. I prefer to track sessions through the URL because cookies may not be enabled on the client computer.
If PHP is compiled with --enable-trans-sid then URLs will contain the session id automatically via the constant PHPSESSID.
Function session_start(void):
Downloading files with PHP
Sun, 02/02/2003 - 05:00 — onajeDownloading Files
Using the header function to force file downloads
If you have files that you would like users to be able to download, it can be done simply by providing a link to the file. When the link is clicked, the browser will prompt the user to download the file or it will display it if the file type is known to the browser i.e. text files and gif/jpeg images. If you do not want the files displayed in the browser you can use the header() in PHP with the appropriate content type to force a file download.
PHP Quiz Script
Mon, 12/16/2002 - 05:00 — onajePHP Quiz Script
Hard coding a graded quiz script in PHP
Quizzes are generally used to test knowledge of a subject.
This is a simple script that will allow you to create a quiz and grade the answers given.
PHP Code:
<?php
$let=array(
"a","b","c","d","e","f","g","h","i",
"j","k","l","m","n","o","p","q","r",
"s","t","u","v","w","x","y","z"
);
//Set a counter to 1
$count = 1;
/* What is a perfect score? Usually 100. */
$psco=100;
/* Deduction for each wrong answer. May be the perfect score divided by the number of questions
Simple MySQL Guestbook
Thu, 12/12/2002 - 05:00 — onajeCreating the guestbook has two parts, the table to hold the guestbook records and the script to insert and select records from the database
table.
The structure of the table should look similar to this:
CREATE TABLE guests (
id int(10) unsigned NOT NULL auto_increment,
guest varchar(50) NOT NULL default '',
message varchar(200) NOT NULL default '',
date datetime default NULL,
PRIMARY KEY (id)
) ;
The guestbook script has three sections - the code for the form, the code for saving the form data, and the code for displaying the data.
A Closer Look: Five MySQL functions that handle query results
Fri, 11/22/2002 - 05:00 — onajeA Closer Look: Five MySQL functions that handle query results
Assigning variable names to a MySQL result set
After executing a query to select data from a MySQL table there are several functions you can use to perform operations on the retrieved data.
mysql_result() - fetches the contents of the specified cell
mysql_data_seek() - moves to the specified row of a result set
mysql_fetch_array() - fetches the next row in the result set as an array
mysql_fetch_object() - fetches the next row in the result set as an object
The Image Creation Capabilities of PHP
Thu, 10/03/2002 - 04:00 — onajeThe Image Creation Capabilities of PHP
PHP image functions will allow you to create images dynamically
"The format of images you are able to manipulate depend on the version of GD you install, and any other libraries GD might need to access those image formats. Versions of GD older than gd-1.6 support gif format images, and do not support png, where versions greater than gd-1.6 support png, not gif." -- From the PHP Manual: Image Functions
Count the number of MySQL Queries
Tue, 09/17/2002 - 04:00 — onajeCount the number of MySQL Queries
How to count the number of MySQL queries used by your script
One way of optimizing your scripts that connect to MySQL databases is to determine how many queries to the database your script makes. If you would like to count the number of queries, you can write a script that will do so. You use this function in place of the regular mysql_query() function.
PHP Code:
<?php
function cnt_mysql_query($sql=FALSE)
{
static $queries = 0;
if (!$sql)
return $queries;
$queries ++;
return mysql_query($sql);
}
$sql= "SELECT 8+9";