55
votes
19
answers
1.1K
views
Returning JSON from a PHP Script
I want to return JSON from a PHP script. Do I just echo the result? Do I have to set the Content-Type header?
52
votes
20
answers
1.3K
views
PHP array delete by value (not key)
I have a PHP array as follows: $messages = [312, 401, 1599, 3, ...]; I want to delete the element containin
56
votes
13
answers
1.1K
views
Detecting request type in PHP (GET, POST, PUT or DELETE)
How can I detect which request type was used (GET, POST, PUT or DELETE) in PHP?
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
53
votes
30
answers
2.1K
views
Get the first element of an array
I have an array: array( 4 => 'apple', 7 => 'orange', 13 => 'plum' )
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
62
votes
30
answers
1.6K
views
Enumerations on PHP
I know that PHP doesn't yet have native Enumerations. But I have become accustomed to them from the Java
58
votes
14
answers
2.2K
views
How to Sort a Multi-dimensional Array by Value
How can I sort this array by the value of the "order" key? Even though the values are currently sequential, th
58
votes
29
answers
572
views
"Notice: Undefined variable", "Notice: Undefined index", and "Notice: Undefined offset" using PHP
I'm running a PHP script and continue to receive errors like: Notice: Undefined variable: my_variable_na
56
votes
28
answers
1.8K
views
How to get the client IP address in PHP
How can I get the client IP address using PHP? I want to keep record of the user who logged into my website t
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
58
votes
30
answers
2.4K
views
startsWith() and endsWith() functions in PHP
How can I write two functions that would take a string and return if it starts with the specified character/st
58
votes
29
answers
603
views
How do I get PHP errors to display?
I have checked my PHP ini file (php.ini) and display_errors is set and also error reporting is E_ALL. I have r
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
56
votes
30
answers
2.3K
views
How do you parse and process HTML/XML in PHP?
How can one parse HTML/XML and extract information from it?
