PHP Tutorials

Tutorials, code snippets and articles relating to PHP.

Warning: session_start(): open_basedir restriction in effect.

This is an issue that occurred when I attempted to run a PHP web application on a Windows IIS server.

PHP: Save an object to MySQL database.

This is a tutorial on how to save PHP objects to a MySQL database. This method will also work with other DBMS systems such as SQL Server and PostgreSQL.

PHP: Storing an array in a session variable.

This is a tutorial on how to store a PHP array in a session variable.

mysql_fetch_array() expects parameter 1 to be resource, boolean given.

This is probably one of the most common PHP errors.

How to truncate a MySQL table with PHP

This PHP tutorial will show you how to empty a MySQL table using the PDO object.

PHP: Select list of MySQL tables (PDO).

This is a tutorial on how to retrieve a list of MySQL tables using PHP and the PDO object.

PHP Comments.

This is a simple tutorial on how to write comments in PHP.

PHP: Fix for “Invalid argument supplied for foreach()”

PHP will display the “invalid argument” warning if your code attempts to loop over a variable that is not an array.

PHP: Create directory based on current date.

This is a PHP tutorial on how to create directories and sub-directories that are based on the current date.

PHP: Create directory if it doesn’t exist.

This is a quick PHP tutorial on how to create a folder or directory if it doesn’t already exist.

PHP: Detect if request type is POST or GET.

In this guide, we will show you how to detect the HTTP request type using PHP. This is useful if you want to restrict URLs to POST, GET, etc.

PHP: PDO transaction example.

In this guide, we will show you how to use transactions with PHP’s PDO object.

Generating a 4-digit PIN code with PHP.

A tutorial on how to generate random PIN codes with PHP.

PHP: Login to website with cURL.

A tutorial on how to login to websites with cURL and PHP.

How to calculate VAT with PHP.

In this tutorial, we will show you how to calculate VAT with PHP. We will also show you how to get the VAT rate from a gross price.

Looping through dates in PHP.

A short guide to looping through dates in PHP.

PHP: Get query execution time.

Measure the execution time of an SQL query in PHP.

Secure passwords with PHP.

An up-to-date tutorial on how to properly deal with passwords in PHP.

PHP: Get the first Monday of a month (and more)

This is a small cheat sheet for PHP’s strtotime function, which can be used to convert textual sentences such as “next Friday” into UNIX timestamps.

PHP: Convert YYYY-MM-DD to DD-MM-YYYY

Convert a YYYY-MM-DD date into a DD-MM-YYYY date in PHP.

Get the last character in a PHP string.

A short guide on how to get the last character of a string in PHP.

PHP FizzBuzz solution

In this guide, we show you how to write a simple PHP solution for the FizzBuzz game.

How to get the structure of a MySQL table in PHP.

This tutorial will show you how to get the structure of a MySQL table using PHP’s PDO object.

PHP CSRF Protection.

In this PHP tutorial, we are going to show you how to prevent Cross-site Request Forgery (CSRF) attacks.

PHP: Haversine Formula function.

A PHP function that implements the Haversine Formula.

PHP: Scalar type hints.

An introduction to scalar type hints in PHP 7.

Measuring the execution time of a PHP script

In this tutorial, we will show you how to measure the execution time of a PHP script using the microtime function.

Generating a random token in PHP.

A short guide on how to generate a secure and random token with PHP.

PHP: Get the first character in a string.

Get the first character in a string with PHP.

PHP: Get the last element in an associative array.

How to get the last element or key in an associative array.

PHP: Calculate the percentage of a number.

A small guide on how to calculate the percentage of a number in PHP.

PHP: Calculating a person’s age from their date of birth.

Calculate a person’s age using PHP.

Ajax form submission with PHP.

A tutorial on how to create an Ajax form that submits data to a PHP script.

PHP: Increase / decrease number by a given percent.

A small tutorial on how to increase or decrease a number by a given percentage in PHP.

PHP: Calculate the percent difference between two numbers.

A quick guide on how to calculate the percentage difference between two numbers in PHP.