This affiliate provides the aboriginal of several hands-on, baby projects advised to cull calm your PHP and MySQL knowledge. In this chapter, you apprentice how to actualize a managed administration account that you can use to accelerate out newsletters or annihilation abroad to a account of email addresses in a database.
The commitment apparatus you use in this affiliate is not meant to be a backup for commitment account software, which is accurately advised for aggregate messages. You should use the blazon of arrangement you body in this affiliate alone for baby lists, beneath than a few hundred email addresses.
You abstruse in beforehand capacity that planning is the best important aspect of creating any product. In this case, anticipate of the elements you charge for your cable mechanism:
The afterward sections alarm anniversary account individually.
You absolutely charge alone one acreage in the subscribers table: to authority the email abode of the user. However, you should accept an ID acreage aloof for bendability amid your tables, and because referencing an ID is abundant simpler than referencing a continued email abode in area clauses. So, in this case, your MySQL concern would attending article like this:
Note the use of UNIQUE in the acreage analogue for email. This agency that although id is the primary key, duplicates should not be accustomed in the email acreage either. The email acreage is a different key, and id is the primary key.
Log in to MySQL via the command band and affair this query. After creating the table, affair a DESC or DESCRIBE concern to verify that the table has been created to your specifications, such as the following:
Now that you accept a table in your database, you can actualize the anatomy and calligraphy that abode ethics in there.
Although there are alone two scripts in this process, some accepted functions abide amid them—namely, the database affiliation information. To accomplish your scripts added abridged in situations like this, booty the accepted functions or cipher snippets and put them in a book to be included in your added scripts via the include() activity that you abstruse about in Affiliate 13, “Working with Files and Directories.” Listing 19.1 contains the cipher aggregate by the scripts in this chapter.
Lines 3–15 set up the aboriginal function, doDB(), which is artlessly the database affiliation function. If the affiliation cannot be made, the calligraphy exits aback this activity is called; otherwise, it makes the amount of $mysqli accessible to added genitalia of your script.
Lines 17–26 ascertain a activity alleged emailChecker(), which takes an ascribe and allotment an output—like best functions do. We attending at this one in the ambience of the script, as we get to it in Listing 19.2
Save this book as ch19_include.php and abode it on your web server. In Listing 19.2, you will see how to accommodate this book aback all-important in your scripts.
The cable anatomy is absolutely an all-in-one anatomy and calligraphy alleged manage.php, which handles both subscribe and unsubscribe requests. Listing 19.2 shows the cipher for manage.php, which uses a few user-defined functions to annihilate alliterative cipher and to alpha you cerebration about creating functions on your own. The cipher looks long, but a line-by-line description follows (and a lot of the cipher aloof displays an HTML form, so no worries).
Listing 19.2 ability be long, but it’s not complicated. In fact, it could be best were it not for the user-defined functions placed in ch19_include.php and included on band 2 of this script.
Line 4 starts the capital argumentation of the script. Because this calligraphy performs several actions, you charge to actuate which activity it is currently attempting. If the attendance of $_POST is false, you apperceive that the user has not submitted the form; therefore, you charge appearance the anatomy to the user.
Lines 6–25 actualize the subscribe/unsubscribe anatomy by autumn a cord in the $display_block capricious application the heredoc format. In the heredoc format, the cord delimiter can be any cord identifier afterward <<<, as continued as the catastrophe identifier is on its own line, as you can see in this archetype on band 25.
In the form, we use $_SERVER[PHP_SELF] as the activity (line 7), and afresh actualize a argument acreage alleged email for the user’s email abode (lines 9–11) and set up a set of radio ons (lines 13–21) to acquisition the adapted task. At the end of the cord creation, the calligraphy break out of the if…else construct, skips bottomward to band 101, and gain to book the HTML stored in the $display_block variable. The anatomy displays as apparent in Figure 19.1.
Back central the if…else construct, if the attendance of $_POST is true, you charge to do something. There are two possibilities: the subscribing and unsubscribing accomplishments for the email abode provided in the form. You actuate which activity to booty by attractive at the amount of $_POST[‘action’] from the radio on group.
In band 26, if the attendance of $_POST is accurate and the amount of $_POST[‘action’] is “sub”, you apperceive the user is aggravating to subscribe. To subscribe, the user needs an email address, so analysis for one in curve 28–30. If no abode is present, alter the user aback to the form.
However, if an abode is present, alarm the doDB() activity (stored in ch19_include.php) in band 34 to affix to the database so that you can affair queries. In band 36, you alarm the additional of our user-defined functions: emailChecker(). This activity takes an ascribe ($_POST[’email’], in this case) and processes it. If you attending aback to curve 21–25 of Listing 19.1, you’ll see cipher aural the emailChecker() activity that issues a concern in an attack to acquisition an id amount in the subscribers table for the almanac absolute the email abode anesthetized to the function. The activity afresh allotment the resultset, alleged $check_res, for use aural the beyond script.
Jump bottomward to band 39 of Listing 19.2 to see how the $check_res capricious is used: The cardinal of annal referred to by the $check_res capricious is counted to actuate whether the email abode already exists in the table. If the cardinal of rows is beneath than 1, the abode is not in the list, and it can be added. The almanac is added, the acknowledgment is stored in curve 44–48, and the abortion bulletin (if the abode is already in the table) is stored in band 54. At that point, the calligraphy break out of the if…else construct, skips bottomward to band 101, and gain to book the HTML currently stored in $display_block. You’ll analysis this functionality later.
The aftermost aggregate of inputs occurs if the attendance of $_POST is accurate and the amount of the $_POST[‘action’] capricious is “unsub”. In this case, the user is aggravating to unsubscribe. To unsubscribe, an absolute email abode is required, so analysis for one in curve 59–61. If no abode is present, accelerate the user aback to the form.
If an abode is present, alarm the doDB() activity in band 64 to affix to the database. Then, in band 67, you alarm emailChecker(), which afresh allotment the resultset, $check_res. Band 70 counts the cardinal of annal in the aftereffect set to actuate whether the email abode already exists in the table. If the cardinal of rows is beneath than 1, the abode is not in the account and it cannot be unsubscribed.
In this case, the acknowledgment bulletin is stored in curve 75–76. However, if the cardinal of rows is not beneath than 1, the user is unsubscribed (the almanac deleted) and the acknowledgment is stored in curve 84–88. At that point, the calligraphy break out of the if…else construct, skips bottomward to band 101, and gain to book the HTML.
Figures 19.2 through 19.5 appearance the assorted after-effects of the script, depending on the accomplishments called and the cachet of email addresses in the database.
Next, you actualize the anatomy and calligraphy that sends forth mail to anniversary of your subscribers.
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