PHP Tutorials

Tutorials, code snippets and articles relating to PHP.

PHP: Return array from include file.

This is a short PHP guide on how to return an array from an included file.

Check if a MySQL row exists using PHP’s PDO object.

In this tutorial, I will be showing you how to check if a row exists in MySQL. To do this, I will be using PHP’s popular PDO object.

PHP: Get numbers from a string.

This is a short PHP tutorial on how to get numbers from a string using the preg_match_all function.

PHP: Increase maximum upload size.

This is a short guide on how to increase PHP’s maximum upload size.

Argument passed to function() must be an instance of ClassName.

This is a short guide on how to fix the “argument must be an instance” error in PHP.

PHP: Check if string starts with a specified string.

This is a short PHP guide on how to check if a string starts with a given string.

Setting custom headers with PHP.

This is a guide on how to set custom HTTP response headers using PHP.

PHP: Disable memory limit.

This is a short guide on how to completely disable PHP’s memory limit value.

Calculating the date of Easter with PHP.

This is a short PHP tutorial on how to calculate what date Easter falls on for a given year.

How to create a ZIP file using PHP.

In this guide, I will show you how to create a ZIP file using PHP.

PHP: Force PDF file to download.

This is a short guide on how to force a PDF file to download using PHP.

Receiving XML via POST in PHP.

In this tutorial, I will show you how to receive an XML string via raw post data using PHP.

How to handle an array of PHP objects.

This is a short guide on how to work with a PHP array that contains objects.

Printing out JSON with PHP.

In this beginner’s tutorial, I will show you how to print out JSON using PHP and specify the correct Content-Type header.

Fix: Unexpected token o in JSON.

A short guide that I wrote on fixing the dreaded “Unexpected token o in JSON” error.

PHP: Following redirects with cURL.

This is a short guide on how to force PHP’s cURL functions to follow a HTTP redirect.

Using PHP with Radio Buttons.

This is a beginner’s tutorial on how to use the Radio Button HTML element with PHP.

PHP: Get visitor country via Cloudflare CF-IPCountry header.

This is a PHP tutorial on how to retrieve a visitor’s country code from Cloudflare’s CF-IPCountry header.

PHP: Using cURL with Basic HTTP Authentication.

This is a short PHP tutorial on how to use cURL to make a Basic Access Authentication request.

PHP: Get the correct IP address from a Cloudflare request.

This article shows you how to the get the user’s IP address from a Cloudflare request using PHP.

Call a PHP function using JavaScript.

This is a common question amongst beginner developers. In this article, I clear up the confusion about it and offer an alternative solution.

PHP: Block POST requests.

In this guide, we show you how to block POST requests using PHP. We also show you which HTTP header you should return to the client.

PHP: Rounding a number up.

This is a beginners guide on how to round a decimal number up using PHP’s ceil function.

PHP cURL: Fixing the “SSL certificate problem: unable to get local issuer certificate” error.

This is a common error that occurs whenever you attempt to use PHP’s cURL functions to connect to an HTTPS website.

PHP tutorial: Converting images into Base 64.

This is a short PHP tutorial on how to convert an image file into Base 64 before displaying it.

Logging to a file with PHP.

This is a short guide on how to log text to a file using PHP.

Get request headers with PHP.

A short tutorial on how to get a client’s request headers using PHP.

PHP: Calculate the ratio between two numbers.

This is a short guide on how to calculate the ratio between two numbers using PHP.

Using a local WSDL file with PHP SoapClient.

This is a short guide on how to use a local WSDL file with the PHP SoapClient object.

PHP trend / forecast function.

Emulating Excel’s TREND / FORECAST function in PHP.

PHP-FPM settings tutorial. max_servers, min_servers, etc.

A guide on selecting the correct www.conf settings for PHP-FPM.

PHP: Send POST request WITHOUT cURL.

This is a short PHP tutorial on how to send a HTTP POST request without using cURL.

Fixing “Uncaught error: Call to undefined function curl_init”

This is a common error that occurs whenever PHP’s curl extension has not been installed or enabled.

PHP: Get a list of included PHP files.

This is a PHP tutorial on how to get a list of files that have been included in your script.

Copy a file with PHP.

This is a short tutorial on how to copy files using PHP.