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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Using print_r in PHP to explore mysql database requests

The print_r function in PHP lets you "print raw" the contents of a variable - great for debugging and far better that print which - if you pass it an array helpfully says Array

Embed your print_r into <pre> to </pre> tags ... so that you get a good display on your browser ... otherwise you'll end up with the spaces removed and a mess. Here's an example - showing the global $_SERVER array, and also the contents of a table that's been brought back to an array of arrays:

<pre><?php
# Show server variables
print_r($_SERVER);
print ("----------------------------\n");
mysql_connect("127.0.0.1","wellho","xxxxxx");
mysql_select_db("wellho");
$rr = mysql_query("select * from recent limit 15");
print_r($rr);
print ("----------------------------\n");
$stuff = array();
while ($nextrow = mysql_fetch_assoc($rr)) {
  array_push($stuff,$nextrow); }
print_r ($stuff);
?></pre>


Select here to see what you get when you run that code. Note how the mysql_query call just returns a resource handle, and you then have to use something like mysql_fetch_assoc to get the actual data back.


(written 2009-10-01, updated 2010-05-15)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
H113 - Using MySQL Databases in PHP Pages
  [104] mysql_connect or mysql_pconnect in PHP? - (2004-10-30)
  [515] MySQL - an FAQ - (2005-12-03)
  [572] Giving the researcher power over database analysis - (2006-01-22)
  [581] Saving a MySQL query results to your local disc for Excel - (2006-01-29)
  [647] Checking for MySQL errors - (2006-03-15)
  [666] Database design - get it right from first principles - (2006-04-02)
  [723] Viewing images held in a MySQL database via PHP - (2006-05-17)
  [915] Paging through hundreds of entries - (2006-11-05)
  [937] Display an image from a MySQL database in a web page via PHP - (2006-11-22)
  [947] What is an SQL injection attack? - (2006-11-27)
  [1010] Dates, times, clickable diarys in PHP - (2006-12-28)
  [1561] Uploading to a MySQL database through PHP - examples and common questions - (2008-03-02)
  [1983] Keeping PHP code in database and running it - (2009-01-09)
  [2071] Setting up a MySQL database from PHP - (2009-03-08)
  [2259] Grouping rows for a summary report - MySQL and PHP - (2009-06-27)
  [2320] Helping new arrivals find out about source code examples - (2009-08-03)
  [2447] MySQL stored procedures / their use on the web from PHP - (2009-10-10)
  [2561] The future of MySQL - (2010-01-03)
  [2628] An example of an injection attack using Javascript - (2010-02-08)
  [3035] How to display information from a database within a web page - (2010-11-07)
  [3455] MySQL, MySQLi, PDO or something else - how best to talk to databases from PHP - (2011-09-24)
  [4378] What FGW passengers want to talk about / and PHP programming to find out - (2015-01-01)
  [4483] Moving from mysql to mysqli - simple worked example - (2015-05-03)

H102 - A First PHP Web Page
  [624] It's REALLY easy to add a little PHP - (2006-02-26)
  [1448] Question on division (Java) - Also Perl, PHP, Python ... - (2007-11-28)
  [3915] How does PHP work? - (2012-11-07)
  [4074] A comment on comments in PHP - (2013-04-28)


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Controlling, supressing, enabling PHP error messages
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Melksham Hotel Rooms - pictures
Serialization - storing and reloading objects
Abstract classes, Interfaces, PHP and Java
Controlling, supressing, enabling PHP error messages
Using print_r in PHP to explore mysql database requests
Moving busstop!
Not just a PHP program - a good web application
Tcl scripts / processes on a web server via CGI
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Operator overloading - redefining addition and other Perl tricks
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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