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How-to articles, tricks, and solutions about PHP

WordPress Issue: Cannot modify header information - headers already sent by

This error message appears when a PHP script is trying to modify the headers of an HTTP response after the headers have already been sent.

php wordpress

Laravel Carbon: how to change timezone without changing the hour?

In Laravel, you can use the setTimezone method on a Carbon instance to change the timezone without changing the hour.

php datetime laravel laravel-5

PHP create PDF invoice

There are several libraries available in PHP that can be used to create PDF invoices, such as TCPDF and FPDF.

php pdf-generation

How to run my php file from mac terminal?

To run a PHP file from the Mac terminal, you will need to have a web server installed, such as Apache, and PHP should be configured correctly with the server.

php

where is php.ini on ubuntu?

On Ubuntu, the location of the php.ini file depends on the version of PHP you have installed.

php ubuntu

How to do single sign-on with PHP?

Single sign-on (SSO) allows users to authenticate once and gain access to multiple applications without having to re-enter their credentials.

php

How to handle Undefined Offset in laravel?

In Laravel, an "Undefined offset" error typically occurs when trying to access an array index that does not exist.

php undefined laravel offset

Merging cells in Excel by rows and columns together using PHPExcel

To merge cells in Excel using PHPExcel, you can use the mergeCells() method.

php phpexcel excel-2007

php echo if two conditions are true

You can use the if statement in PHP to check if two conditions are true.

php echo file-exists if-statement

PHP_SELF vs PATH_INFO vs SCRIPT_NAME vs REQUEST_URI

PHP_SELF, PATH_INFO, SCRIPT_NAME, and REQUEST_URI are all superglobal variables in PHP that provide information about the current URL being requested.

php http codeigniter