57
votes
29
answers
1.2K
views
What does "use strict" do in JavaScript, and what is the reasoning behind it?
Recently, I ran some of my JavaScript code through Crockford's JSLint, and it gave the following error:
56
votes
30
answers
2.5K
views
How do I check if an element is hidden in jQuery?
Is it possible to toggle the visibility of an element, using the functions .hide(), .show() or .toggle()? How
54
votes
30
answers
2.5K
views
How can I remove a specific item from an array?
I have an array of numbers and I'm using the .push() method to add elements to it. Is there a simple way
60
votes
17
answers
2.3K
views
How do I implement basic "Long Polling"?
I can find lots of information on how Long Polling works (For example, this, and this), but no simple examples
67
votes
30
answers
2K
views
How do I convert a string to a number in PHP?
I want to convert these types of values, '3', '2.34', '0.234343', etc. to a numb
59
votes
4
answers
1.7K
views
What is thread safe or non-thread safe in PHP?
I saw different binaries for PHP, like non-thread or thread safe? What does this mean? What is the differen
52
votes
17
answers
1.5K
views
What is the difference between public, private, and protected?
When and why should I use public, private, and protected functions and variables inside a class? What is the d
65
votes
4
answers
1.8K
views
What are Long-Polling, Websockets, Server-Sent Events (SSE) and Comet?
I have tried reading some articles, but I am not very clear on the concepts yet. Would someone like to take a
59
votes
17
answers
361
views
How do I expire a PHP session after 30 minutes?
I need to keep a session alive for 30 minutes and then destroy it.
59
votes
17
answers
1.3K
views
55
votes
18
answers
3.1K
views
How can I sanitize user input with PHP?
Is there a catchall function somewhere that works well for sanitizing user input for SQL injection and XSS att
62
votes
30
answers
724
views
Reference - What does this error mean in PHP?
What is this? This is a number of answers about warnings, errors, and notices you might encounter while progra
66
votes
14
answers
2.5K
views
Secure hash and salt for PHP passwords
It is currently said that MD5 is partially unsafe. Taking this into consideration, I'd like to know which
61
votes
16
answers
3K
views
UTF-8 all the way through
I'm setting up a new server and want to support UTF-8 fully in my web application. I have tried this in
52
votes
11
answers
2.1K
views
How do you use bcrypt for hashing passwords in PHP?
Every now and then I hear the advice "Use bcrypt for storing passwords in PHP, bcrypt rules". But what is bcr
60
votes
26
answers
2K
views
Difference between require, include, require_once and include_once?
In PHP: When should I use require vs. include? When should I use require_once vs. include_once?
63
votes
30
answers
2.2K
views
How do I make a redirect in PHP?
Is it possible to redirect a user to a different page through the use of PHP? Say the user goes to www.exampl
55
votes
23
answers
1.3K
views
When should I use 'self' over '$this'?
In PHP 5, what is the difference between using self and $this? When is each appropriate?
69
votes
7
answers
1.9K
views
How does PHP 'foreach' actually work?
Let me prefix this by saying that I know what foreach is, does and how to use it. This question concerns how i
58
votes
30
answers
2.9K
views
How do I get a YouTube video thumbnail from the YouTube API?
If I have a YouTube video URL, is there any way to use PHP and cURL to get the associated thumbnail from the Y
