1. Assignment help PHP + MySQL crash course
11/20/2018
Assignment help PHP + MySQL crash course
Gyozo Gidofalvi

2. Assignment
Implement a movie database with a web front-end using the Linux-Apache-MySQL-PHP, or LAMP, Web development framework
To be completed in groups (3-5)
Deploy solution
See me in the lab to get a MySQL account for your group
Demo your solution during the scheduled labs
11/20/2018
Gyozo Gidofalvi

3. Connecting to MySQL from PHP
<?
$link = mysql_connect($hostname, $username, $password)
or die("Could not open connection to database");
?>
Now the variable $link contains the information for your connection to MySQL. You can disconnect using:
mysql_close($link)
or die("Could not close connection to database");
11/20/2018
Gyozo Gidofalvi

4. Select a database, issue queries
Once you have connected successfully, you should select the database you will use. Then you can issue queries to the database.
<?
mysql_select_db(“ecomXXXX", $link)
or die("Could not select database");
$result = mysql_query("select * from some_table")
or die("Could not issue MySQL query");
?>
Now the variable $result will be used to reference the query we just made.
11/20/2018
Gyozo Gidofalvi

5. Array handling in PHP
In PHP, arrays are associative. Any number or string can be used to index an array.
<?
$array["hello"] = 3;
$array[5] = "how are you?";
while (list($column, $value) = each($array)) {
print("$column = $value\n"); }
reset($array);
?>
This example would print:
hello = 3
5 = how are you?
The command reset($array) puts the array iterator back to the beginning of the array.
11/20/2018
Gyozo Gidofalvi

6. Getting the results from a query
After issuing a query, you retrieve the results using the variable $result.
<?
if (mysql_num_rows($result) == 0) {
print("No results matching your query<BR>\n");
} else {
print("Here are the results:<BR>\n");
while ($row = mysql_fetch_row($result)) {
while (list($colname, $value) = each($row)) {
print("$value "); }
print("<BR>\n");
?>
11/20/2018
Gyozo Gidofalvi

7. HTML forms and PHP variables
From an HTML page that had this form:
<FORM ACTION="target.php" METHOD="GET">
<INPUT TYPE="TEXT" NAME="myvar">
<INPUT TYPE="TEXT" NAME="yourvar">
<INPUT TYPE="SUBMIT" NAME="submit">
</FORM>
The PHP script (target.php) will receive the variables from the form by the same name:
<?
print("you entered myvar = $_GET[myvar], yourvar = $_GET[yourvar]\n");
?>
11/20/2018
Gyozo Gidofalvi

8. Useful string stuff in PHP
Difference between single and double quotes:
<?
$name = "Joe";
print("hello, your name is $name\n");
print(‘hello, your name is $name\n’);
?>
Output: hello, your name is Joe
hello, your name is $name
$trimmed = trim(" this string has whitespace "); removes leading and trailing whitespace
$encoded = urlencode("this is a non-encoded url string"); changes the argument so that it will be part of a valid URL
11/20/2018
Gyozo Gidofalvi