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Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
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Selecting information from a database table - fully validated
Using MySQL Databases in PHP Pages example from a Well House Consultants training course
More on Using MySQL Databases in PHP Pages [link]
Source code: select2.php Module: H113
<head><title>Look up a place in an SQL table</title></head>
<body bgcolor=white>
<h1>We know where you are!</h1>
<form>What does your postcode start with? <input name=pc></form>
/////////////// See if the user completed a form or not
if ($_GET[pc] == "") {
        print ("Your results will come here");
} else {
/////////////// And if the user DID complete a form, make sure that the
/////////////// data entered didn't contain any illegal characters
        $bpos=strspn( strtolower($_GET[pc]), "abcdefghihjlmnopqrstuvwxyz");
        if ($bpos < strlen($_GET[pc])) {
                $pc = $_GET[pc];
You are only allowed letters in the string to search in
this particular example. You didn't :-( ....<br>
                die ("First bad character was '$pc[$bpos]'");

//////////////// Connect to the MySQL server, and flag any errors if
//////////////// the connection cannot be established
        $dbid = mysql_connect("bhajee","trainee","abc123");
        $dbid or die ("Sorry - SQL server is unavailable");

//////////////// Select the database called "test" and flag any errors
//////////////// if the database selection fails
        mysql_select_db("test",$dbid) or
                die("No database called test");

/////////////// Make up the query. Note - we have already checked the
/////////////// incoming variable for illegal characters, so there's no
/////////////// need to addslashes here, nor to htmlspecialchars $query
/////////////// in the printed text
        $query = 'SELECT * from dist WHERE code LIKE "%'.
                $_GET[pc]. '%"';
        print ("My query is <b>$query</b><br>");

////////////////// Run the query, and flag any error that are thrown up
////////////////// Could be a problem if user "trainee" doesn't have select_priv
        $result = mysql_query($query,$dbid) or
                die("Unable to run your query");

////////////////// Fetch results back. No errors will be flagged; a false
////////////////// return will come back when results are completed
        while ($record = mysql_fetch_assoc($result)) {
////////////////// Apply htmlspecialchars to the fields back from the database
////////////////// in case the have lessthan ampersand quote or greaterthans in them
                print (htmlspecialchars($record[code])." is ".

////////////////// If the result set was empty, tell the user - don't just give
////////////////// back an empty window!
        if ($counter < 1) {
                print ("Nice input - pity it didn't match");
Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in PHP
 * PHP Programming
 * MySQL
 * PHP Programming
 * Learning to program in PHP
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering PHP are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Using MySQL Databases in PHP Pages" training module. You'll find a description of the topic and some other closely related examples on the "Using MySQL Databases in PHP Pages" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

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This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

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