jQuery
$.inArray(value, array)
Underscore
_.contains(list, value)
All posts by Tomislav Vlahović
PHP run process in background
This launches the command $cmd, redirects the command output to $outputfile, and writes the process id to $pidfile.
exec(sprintf("%s > %s 2>&1 & echo $! >> %s", $cmd, $outputfile, $pidfile));
This lets you easily monitor what the process is doing and if it’s still running.
function isRunning($pid){
try{
$result = shell_exec(sprintf("ps %d", $pid));
if( count(preg_split("/\n/", $result)) > 2){
return true;
}
}catch(Exception $e){}
return false;
}
Manual:
wordpress set user_id
$user_id = (is_user_logged_in() &&
!empty($current_user)) ? $current_user->ID : '';
if(empty($user_id)){
$current_user = wp_get_current_user();
if($current_user instanceof WP_User){
$user_id = $current_user->ID;
}
}
Setting hostname in ubuntu
Most people recommend setting up the hostname on a Linux box so that:
1) running ‘hostname‘ returns the short name (i.e. myhost)
2) running ‘hostname -f‘ returns the FQDN (i.e. myhost.prod.example.com)
3) running ‘hostname -d‘ returns the domain name (i.e prod.example.com)
After experimenting a bit and also finding this helpful Server Fault post, here’s what we did to achieve this (we did it via Chef recipes, but it amounts to the same thing):
- make sure we have the short name in /etc/hostname:
myhost
(also run ‘hostname myhost‘ at the command line)
- make sure we have the FQDN as the first entry associated with the IP of the server in /etc/hosts:
10.0.1.10 myhost.prod.example.com myhost myhost.prod
- make sure we have the domain name set up as the search domain in /etc/resolv.conf:
search prod.example.com
Reboot the box when you’re done to make sure all of this survives reboots.
http://agiletesting.blogspot.com/2014/06/setting-up-hostname-in-ubuntu.html
Examine ssh failed logins log
grep "Invalid user " /var/log/auth.log | cut -d' ' -f10 | awk '{a[$0]++}END{for(i in a)print i,a[i]}' | sort -k 2 -n -r | head -n 100
grep "Invalid user " /var/log/auth.log | cut -d' ' -f8 | awk '{a[$0]++}END{for(i in a)print i,a[i]}' | sort -k 2 -n -r | head -n 100
Javscript client side error logging
<script type="text/javascript" src="/static/js/stacktrace.js">
</script>
<script type="text/javascript">
window.onerror = function () {
var stackTrace, argData, docData, request;
var _doc = {};
_doc.URL = document.URL;
docData = encodeURIComponent(
JSON.stringify(_doc));
argData = encodeURIComponent(
JSON.stringify(arguments));
stackTrace = JSON.stringify(printStackTrace());
console.log(arguments);
request = new XMLHttpRequest();
request.open(
'POST',
"https://www.yoursite.com/error-logging-url"
);
request.setRequestHeader(
"Content-type",
"application/x-www-form-urlencoded"
);
request.onload = function (e) {};
request.send(
"docData=" + docData + "&" + "argData="
+ argData + "&" + "stackTrace=" + stackTrace);
return false;
}
</script>
Code quality
Answer yes or no to each.
- Could a new developer run the code on their machine within five minutes?
- Could you look at any section of code and understand its purpose?
- Could you locate the code for any feature within ten minutes?
- Could you explain all of the code in a way that a junior developer could understand?
- Could you re-factor the code without fear of breaking it?
- Could you test a component without testing its dependencies?
- If any library or technology becomes obsolete, could you replace it easily?
- Could you take modules and re-use them in other projects with no modification?
- Can you be certain that each line of code is actually being used?
- If the code became open-source, would you be happy to be associated with it?
The Joel Test
- Do you use source control?
- Can you make a build in one step?
- Do you make daily builds?
- Do you have a bug database?
- Do you fix bugs before writing new code?
- Do you have an up-to-date schedule?
- Do you have a spec?
- Do programmers have quiet working conditions?
- Do you use the best tools money can buy?
- Do you have testers?
- Do new candidates write code during their interview?
- Do you do hallway usability testing?
WordPress Check User Role Function
/**
* Checks if a particular user has a role.
* Returns true if a match was found.
*
* @param string $role Role name.
* @param int $user_id (Optional) The ID of a user. Defaults to the current user.
* @return bool
*/
function appthemes_check_user_role( $role, $user_id = null ) {
if ( is_numeric( $user_id ) )
$user = get_userdata( $user_id );
else
$user = wp_get_current_user();
if ( empty( $user ) )
return false;
return in_array( $role, (array) $user->roles );
}
// example use for the current user
if ( appthemes_check_user_role( 'customer' )
_e( "You've got access dude!", 'appthemes' );
else
_e( "Sorry man, no luck.", 'appthemes' );
// example use for a specific user
$user_id = 23;
if ( appthemes_check_user_role( 'customer', $user_id )
_e( "You've got access dude!", 'appthemes' );
else
_e( "Sorry man, no luck.", 'appthemes' );
WordPress jQuery document ready
jQuery(document).ready(function($){
// now you can use jQuery code here with normal $ shortcut formatting
});
trim whitespace
if(typeof(String.prototype.trim) === "undefined")
{
String.prototype.trim = function()
{
return String(this).replace(/^\s+|\s+$/g, '');
};
}
The trim function will now be available as a first-class function on your strings. For example:
" dog".trim() === "dog" //true