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Compatibilitytaking it seriously
What is it?
Not breaking thingsfrom version to version
Maintaining methodsmethod v1 still works with method v2
Keeping consistencydesign, database schema, markup, etc
Basic examples
PHP
function do_thi_thing() { }
version 1.0
function do_this_thing() { }
version 2.0
Fatal errorundefined function: do_thi_thing()
function do_thi_thing() { return do_this_thing(); }
Solution:
CSS / HTML
.entry { background: #f0f0f0 }
<div class=“entry”>
.entry { background: #f0f0f0 }
<div class=“post”>
No more #f0f0f0
Oops
<div class=“post entry”>
Solution:
Filenames
require_once ‘includes/class-authors.php’;
class-authors.php
require_once ‘includes/class-authors.php’;
class-vendors.php
Fatal errorfile not found
Metadataget_post_meta( $post_id, ‘city_name’, true );
value: New York
Metadataget_post_meta( $post_id, ‘city’, true );
value:
function pw_filter_old_meta( $check, $object_id, $meta_key, $single ) {
if( 'city_name' === $meta_key ) {
$check = get_post_meta( $object_id, 'city', $single );
}
return $check;
}
add_filter( 'get_post_metadata', 'pw_filter_old_meta', 10, 4 );
Solution:
Solution:get_post_meta( $post_id, ‘city’, true );
value: New York
get_post_meta( $post_id, ‘city_name’, true );
value: New York
So many more
How easy is it?
Why worry about it?
What’s the benefit?
Does it slow you
down?
Case Study
EDD Signed URLslongest outstanding issue for EDD, 12/19/2012
2.3 released 3 days ago - how’d we do?
Old Methodhttp://edd/index.php?download_key={key}&email={email}&file=fil
e}&price_id={price}&download_id={id}&expire={expire}
http://edd/index.php?download_key=7211cce2df06b572890934
752a4c0896&email=pippin%40pippinsplugins.com&file=1&price
_id=1&download_id=514&expire=MTQyNDE2NzcyOQ%3D%3D
New Methodhttp://edd/index.php?eddfile={file}&ttl={expre}&token={tok
en}
http://edd/index.php?eddfile=2231%3A514%3A0&ttl=142
4167604&token=4d0a86fb8f8be40cf9927222076a5ced
Potential Breakagelet’s consider the possibilities
40,000+ active sitesbasic assumptions:
40,000+ active sitesbasic assumptions:
50 customers per site
40,000+ active sitesbasic assumptions:
50 customers per site
1 sale per customer / 1 download link per customer
40,000+ active sitesbasic assumptions:
50 customers per site
1 sale per customer / 1 download link per customer
50*40,000 = 2,000,000 broken download links
40,000+ active sitesbasic assumptions:
50 customers per site
1 sale per customer / 1 download link per customer
50*40,000 = 2,000,000 broken download links
…..
40,000+ active sitesbasic assumptions:
50 customers per site
1 sale per customer / 1 download link per customer
50*40,000 = 2,000,000 broken download links
…..
probably vastly under exaggeration
Challenge acceptedprogramming is all about challenges
Make it a goal
Mentalitygreat development is more about how it is thought out
than how it is done
your attitude and dedication will go further than your
knowledge of syntax
“I will”
