Tutorial by Examples: re

SQL injection is an attack made on the database query. In PHP, we use mysql_real_escape_string() function to prevent this along with other techniques but CodeIgniter provides inbuilt functions and libraries to prevent this. We can prevent SQL Injection in CodeIgniter in the following three ways − ...

CSRF stands for cross-site request forgery. You can prevent this attack by enabling an option in the application/config/config.php file as shown below. $config['csrf_protection'] = TRUE; When you create a form using the form_open() function, it will automatically insert a CSRF token in a hidden ...

// XSS Filtering $data = array( 'name'=> '<script>Abuse Data</script>' ); $data = $this->security->xss_clean($data); // Clean Data // Escaping Queries <?php $username = $this->input->post('username'); $query = 'SELECT * FROM subscribers_tbl ...

Don't rely on any user input. user input everything like <script> tag or any javascript alert(); so we have to prevent this all data will no run in our browser. so we have to use xss prevention method to restrict our secure data to kept in hacker hand and also it's developer's responsibility t...

By setting Multi-Release: true in the MANIFEST.MF file, the Jar file becomes a multi-release Jar and the Java runtime (as long as it supports the MRJAR format) will pick the appropriate versions of classes depending on the current major version. The structure of such a Jar is the following: jar ro...

The jar command can be used to create a multi-release Jar containing two versions of the same class compiled for both Java 8 and Java 9, albeit with a warning telling that the classes are identical: C:\Users\manouti>jar --create --file MR.jar -C sampleproject-base demo --release 9 -C sampleproje...

Given the following multi-release Jar: jar root - demo - SampleClass.class - META-INF - versions - 9 - demo - SampleClass.class The following class prints the URL of the SampleClass: package demo; import java.net.URL; public class Main...

The following prints all stack frames of the current thread: 1 package test; 2 3 import java.lang.StackWalker.StackFrame; 4 import java.lang.reflect.InvocationTargetException; 5 import java.lang.reflect.Method; 6 import java.util.List; 7 import java.util.stream.Collectors; 8 9 pu...

The following prints the current caller class. Note that in this case, the StackWalker needs to be created with the option RETAIN_CLASS_REFERENCE, so that Class instances are retained in the StackFrame objects. Otherwise an exception would occur. public class StackWalkerExample { public stat...

A couple of other options allow stack traces to include implementation and/or reflection frames. This may be useful for debugging purposes. For instance, we can add the SHOW_REFLECT_FRAMES option to the StackWalker instance upon creation, so that the frames for the reflective methods are printed as ...

Table ORDERS +---------+------------+----------+-------+--------+ | orderid | customerid | customer | total | items | +---------+------------+----------+-------+--------+ | 1 | 1 | Bob | 1300 | 10 | | 2 | 3 | Fred | 500 | 2 | | 3 | ...

Use Nginx map to parse fields and reject requests. # Allowed hosts map $http_host $name { hostnames; default no; example.com yes; *.example.com yes; example.org yes; *.example.org yes; .example.net yes; wap.* yes; } # Allowed count...

Problem Factors are used to represent variables that take values from a set of categories, known as Levels in R. For example, some experiment could be characterized by the energy level of a battery, with four levels: empty, low, normal, and full. Then, for 5 different sampling sites, those levels c...

math.js 'use strict'; const Promise = require('bluebird'); module.exports = { // example of a callback-only method callbackSum: function(a, b, callback) { if (typeof a !== 'number') return callback(new Error('"a" must be a number')); if (typeof b !== 'number...

Many recursive algorithms can be expressed using iteration. For instance, the greatest common denominator function can be written recursively: def gdc (x, y) return x if y == 0 return gdc(y, x%y) end or iteratively: def gdc_iter (x, y) while y != 0 do x, y = y, x%y end re...

SharePoint 2013: Access User Profile Service Data using JSOM in SharePoint 2013 ​ In this article, we will learn to manage or access User Profile Service(UPS) Application using JSOM (Javascript Object Model) and create a basic App. Before we start, lets go through basic UPS terminology first. Us...

It's possible to have your own custom code styles, share them with other team members and use a shortcut to auto format the code in a file. To create your own custom code style, go to: Preferences -> Editor -> Code Style There are some general code style settings here. You can also select ...

Users may face the following issue: log4j:WARN No appenders could be found for logger (dao.hsqlmanager). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info. One reason this can occur is if the log4j.prop...

In the following naive parallel merge sort example, std::async is used to launch multiple parallel merge_sort tasks. std::future is used to wait for the results and synchronize them: #include <iostream> using namespace std; void merge(int low,int mid,int high, vector<int>&num)...