#basic

Commonly used operators in programming

Arithmetic Operators:

+ Addition
- Subtraction
* Multiplication
/ Division
% Modulus (Remainder)
++ Increment
-- Decrement

Assignment Operators:

= Assignment
+= Addition assignment
-= Subtraction assignment
*= Multiplication assignment
/= Division assignment
%= Modulus assignment

Comparison Operators:

== Equal to
!= Not equal to
< Less than
> Greater than
<= Less than or equal to
>= Greater than or equal to

Logical Operators:

&& Logical AND
|| Logical OR
! Logical NOT

Conditional (Ternary) Operator:
? Conditional expression

Delimiters:

() Parentheses
{} curly brackets
[] square brackets
<> Angle brackets

Comments:

// Single-line comment
/* */ Multi-line comment

#php #ci4

Example code to validate rules for form submission in Codeigniter

$validation = \Config\Services::validation();

// Set the validation rules
$validation->setRules([
'username' => 'required|min_length[5]',
'email' => 'required|valid_email',
'password' => 'required|min_length[8]',
]);

// Run the validation
if (!$validation->withRequest($this->request)->run()) {
// Validation failed, redirect back with errors
return redirect()->back()->withInput()->with('errors', $validation->getErrors());
}

SQL INJECTION PAYLOAD LIST
#mysql #sql

#bestPractice #php #js #py
Join an array into String in (PHP, JS, PY)

Bad practice:
//python
print("a" + " " + "b)

//php
echo "a"." ".b";

Best Practice:
// js
console.log(["a", "b"].join(" "));

//python
print(" ".join(["a", "b"])

//php
echo implode(" ", ["a", "b"]);

#js
Instant Execute Function in js

// Normally:

(function() {
// Code to be executed immediately
})();

//Best Way Its called arrow function:

(() => {
// Code to be executed immediately
})();

#bestPractice #js
How to prevent Cannot read properties of undefined using ? operator

let user = { };

Noob coders:
if(user && user.name){
console.log(user.name);
}else{
console.log("No name found in user object")
}

Pro coders:
console.log(user?.name ?? "No name found in user Object")


Pro tips by Biswa

#ci4 #ajax

How to enable csrf protection in ajax request in Ci 4

// Get csrf token from csrf field
var csrfToken = '<?= csrf_token() ?>';

// Make an AJAX request
$.ajax({
url: 'your_ajax_endpoint',
type: 'POST',
data: {
csrf_test_name: csrfToken, // Include the CSRF token in the request payload
// Other data parameters
},
success: function(response) {
// Handle the response
},
error: function(xhr, status, error) {
// Handle the error
}
});

Ci 4 controller:

$csrfToken = $this->request->getVar('csrf_test_name');

if (!csrf_check($csrfToken)) {
// CSRF verification failed, handle the error
return $this->response->setStatusCode(403)->setBody('Invalid CSRF token');
}

#ci4 #framework

How to check header property in ci 4

$headerValue = $this->request->header('Header-Name');

// Verify

($this->request->hasHeader('Header-Name'))

Protect your site from bots using FingerPrintJs

https://fingerprintjs.github.io/BotD/main/

Example usage:

const botdPromise = import('https://openfpcdn.io/botd/v1').then((Botd) => Botd.load()) // Get detection results when you need them. botdPromise .then((botd) => botd.detect()) .then((result) => console.log(result)) .catch((error) => console.error(error))

Bonus tips: Put the code in head tag
Use Load event
addEvenListener("load"... Bot detection will trigger when document loaded

How to merge 2 or many json dict into One in (Python, PHP, JS)

#js
var b = { success:true }
var c = { message: "something", ...b }
console.log(c)

Usage: Use "var" keyword to re assign the variable and use spread method to merge "...json object "

#php
$b = [ "success"=> true ];
$c = ["biswa":"string"];
array_merge($b, $c)

Usage: array_merge used to merge arrays into one array and we need use json_decode and json_encode to make a json obj

#py

Best way to merge in python is using unpacking operator **dict_name here is example:

b = { "success":True }
c = { "hell":None}
print({**b, **c})

Good Looking Toast UI

Usage:

import { toast } from 'https://cdn.skypack.dev/wc-toast';

// Error message
toast.error('Authentication failed');
// Success message
toast.success('Authentication success');

Download Source:
https://github.com/abdmmar/wc-toast/archive/refs/heads/main.zip

Demo:
https://www.cssscript.com/demo/notification-wc-toast

#python
Basic Threading Example - Run your code in parallel

import threading
def sum(x, y):
result = x + y
print(f"The sum of {x} and {y} is {result}")

# Number of iterations num_iterations = 50

# Loop to create and start threads

for i in range(num_iterations):

thread = threading.Thread(target=sum, args=(3, 5))

# Start the thread

thread.start()

# Wait for all threads to finish

thread.join()

print("Program completed.")

Usage:
target= which function do u want to run on thread

args= the required params of targeted function

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