How to Install PHP 8.3 on Ubuntu 26.04, 24.04 and 22.04

 importar chave repo

sudo apt install -y ca-certificates curl
sudo curl -fsSLo /usr/share/keyrings/deb.sury.org-php.gpg https://packages.sury.org/php/apt.gpg

criar arquivo do repo - copiar texto a seguir, colar e executar no terminal

. /etc/os-release
ARCH="$(dpkg --print-architecture)"

case "$VERSION_CODENAME:$ARCH" in
  resolute:amd64|resolute:arm64|noble:amd64|noble:arm64|noble:armhf|jammy:amd64|jammy:arm64|jammy:armhf)
    printf '%s\n' \
      'Types: deb' \
      'URIs: https://packages.sury.org/php/' \
      "Suites: $VERSION_CODENAME" \
      'Components: main' \
      "Architectures: $ARCH" \
      'Signed-By: /usr/share/keyrings/deb.sury.org-php.gpg' | sudo tee /etc/apt/sources.list.d/php.sources > /dev/null
    ;;
  *)
    printf 'This PHP 8.3 workflow covers Ubuntu 26.04 on amd64/arm64 and Ubuntu 24.04/22.04 on amd64/arm64/armhf; this host reports %s/%s.\n' "$VERSION_CODENAME" "$ARCH" >&2
    false
    ;;
esac



apt update

apt upgrade -y

source: https://linuxcapable.com/how-to-install-php-8-3-on-ubuntu-linux/

Ubuntu 24.04 PHP OCI8 error

 

As oci8.so still expecting libaio.so.1, creating the following symlink resolves the issue:

ln -s /usr/lib/x86_64-linux-gnu/libaio.so.1t64 /usr/lib/x86_64-linux-gnu/libaio.so.1

Text file on the fly for user to download using php

Here's the code for generating a text file on the file for user to download.
Make sure you don't have any output before this code, otherwise it will be shown on the downloaded file also.


<php? //Generate text file on the fly

   header("Content-type: text/plain");
   header("Content-Disposition: attachment; filename=test.txt");

   $str="test";

   echo $str;
  
 ?>

Restrict PHP Information Leakage

1 - To restrict PHP information leakage disable expose_php.
Edit /etc/php.d/secutity.ini and set the following directive:

expose_php=Off

2 - Do not expose PHP error messages to all site visitors.
Edit /etc/php.d/security.ini and set the following directive:

display_errors=Off

Make sure you log all php errors to a log file:

log_errors=On
error_log=/var/log/httpd/php_scripts_error.log


3 - Limit PHP Access To File System

The open_basedir directive set the directories from which PHP is allowed to access files using functions like fopen(), and others. If a file is outside of the paths defined by open_basdir, PHP will refuse to open it. You cannot use a symbolic link as a workaround. For example only allow access to /var/www/html directory and not to /var/www, or /tmp or /etc directories:

; Limits the PHP process from accessing files outside
; of specifically designated directories such as /var/www/html/
open_basedir="/var/www/html/"
; ------------------------------------
; Multiple dirs example
; open_basedir="/home/httpd/vhost/cyberciti.biz/html/:/home/httpd/vhost/nixcraft.com/html/:/home/httpd/vhost/theos.in/html/"
; ------------------------------------
 


More:
https://www.cyberciti.biz/tips/php-security-best-practices-tutorial.html

PHP CSV to Table

<?php
echo "<html><body><table>\n\n";
$f = fopen("so-csv.csv", "r");
while (($line = fgetcsv($f)) !== false) {
        echo "<tr>";
        foreach ($line as $cell) {
                echo "<td>" . htmlspecialchars($cell) . "</td>";
        }
        echo "</tr>\n";
}
fclose($f);
echo "\n</table></body></html>";

?>