php.md

php

<?php
// php code here
?>

display all errors

<?php
ini_set('display_startup_errors', '1');
ini_set('display_errors', '1');
error_reporting(E_ALL);

ini_set('log_errors', '1');
ini_set('error_log', 'php_errors.log');

in php.ini file:

error_reporting = E_ALL
display_errors = On
display_startup_errors = On
log_errors = On
; If you set the error_log directive to a relative path, it is a path relative
; to the document root rather than php's containing folder.
error_log = php_errors.log

PHP DEBUGGING CODE IGNITER APP (in local development)

Steps:

1. Aquire xdebug.so file: We can install it using package manager. Ex: sudo pacman -S xdebug this will create .so file mostly in following location: /usr/lib/php/modules/xdebug.so. If you failed in above step, then please follow wizard and complete this step.

2. configuring php ini file: Get the location of the ini file using php --ini, in my case its /etc/php/php.ini. Somewhere I read that its better to have separate ini file for xdebug, so create /etc/php/conf.d/99-xdebug.ini using touch /etc/php/conf.d/99-xdebug.ini. And add the following content in 99-xdebug.ini file:

zend_extension=xdebug
xdebug.mode=debug
xdebug.start_with_request = yes

xdebug.client_host=127.0.0.1
xdebug.client_port=9003
xdebug.log=/tmp/xdebug.log ; optional, to see WTF is happening

Verify that the newly created ini file is being loaded by reading output of php --ini command.

3. Configuring VSCode: At the root of the project, create .vscode/launch.json file, and add following content:

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Listen for Xdebug",
      "type": "php",
      "request": "launch",
      "port": 9003,
      "pathMappings": {
        "/absolute/path/to/the/codeigniter-project": "${workspaceFolder}"
      }
    }
  ]
}

Note that inside pathMappings you need to update the key to absolute path to you code ignite app (root of the project).

4. Final Step

• Start the vs code debuger (Listen for Xdebug)
• Open terminal at the root of the project and start serving the app: ./spark serve --port 8000
• Put some breakpoints in source code in vscode
• Load the application in browser http://localhost:8000 and navigate to the pages related code where you put breakpoints.
• Congratulations you hit the breakpoint. Thank me now :)

exploring php

link: https://github.com/wilmoore/php-version/wiki/Exploring-PHP

Identify full path to PHP binaries

which php
which php-fpm
which pear
which pecl
which phar
which php-cgi
which php-config
which phpize

View manual pages

man php
man php-fpm
man php-config
man phpize

useful dynamic extensions

curl
intl
mysqli
pdo_mysql
zip

max

max_execution_time = 3600
memory_limit = 1024M
post_max_size = 512M
upload_max_filesize = 10M

php-fpm

• as which user php-fpm service runs?

  • link: https://unix.stackexchange.com/questions/30190/how-do-i-set-the-user-of-php-fpm-to-be-php-user-instead-of-www-data

• in ubuntu

  • php-fpm location: /etc/php/8.1/fpm
  • php.ini location: /etc/php/8.1/fpm/php.ini
  • starting php-fpm service: service php8.1-fpm start