Require PHP 5.5+ (#2495)

* Require PHP 5.5+

https://github.com/FreshRSS/FreshRSS/issues/2469#issuecomment-522255093
I think it would be reasonable to require PHP 5.5+ for the core of
FreshRSS after all.

As Frenzie said, WordPress currently requires PHP 5.6.20+, and it is the
most popular PHP application.

We would loose about 20% of the PHP servers according to
https://w3techs.com/technologies/details/pl-php/5/all but I expect this
number to drop fast after the release of CentOS 8 (CentOS accounts for
17% of Linux servers
https://w3techs.com/technologies/details/os-linux/all/all ).

Distributions:
* no impact on Ubuntu, Fedora, Alpine, OpenWRT, FreeBSD, OpenSuze,
Mageia, as all active versions have PHP > 7
* no impact on OpenSuze, Synology, as all active versions have PHP > 5.5
* we drop Debian 8 Jessie (-2020) - we keep supporting Debian 9 Stretch
(2017-06) - current is Debian 10 Buster
* we drop Red Hat 7 (-2024) - we keep supporting RHEL 8 (2019-05)
* we drop CentOS 7 (-2024) - we will support CentOS 8 (to be released
soonish)

When dropping older versions, I can better like when it is for a good
reason, and there is actually one with PHP 5.5, namely generators
(yield) https://php.net/language.generators.overview which I consider
using.

* Version note for JSON.php

* hex2bin

* Update .travis.yml

Co-Authored-By: Frans de Jonge <fransdejonge@gmail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/app/Models/EntryDAO.php b/app/Models/EntryDAO.php
index b47cd55ad..1b2786a6a 100644
--- a/app/Models/EntryDAO.php
+++ b/app/Models/EntryDAO.php
@@ -191,7 +191,7 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 			if ($this->hasNativeHex()) {
 				$this->addEntryPrepared->bindParam(':hash', $valuesTmp['hash']);
 			} else {
-				$valuesTmp['hashBin'] = pack('H*', $valuesTmp['hash']);	//hex2bin() is PHP5.4+
+				$valuesTmp['hashBin'] = hex2bin($valuesTmp['hash']);
 				$this->addEntryPrepared->bindParam(':hash', $valuesTmp['hashBin']);
 			}
 		}
@@ -273,7 +273,7 @@ class FreshRSS_EntryDAO extends Minz_ModelPdo implements FreshRSS_Searchable {
 		if ($this->hasNativeHex()) {
 			$this->updateEntryPrepared->bindParam(':hash', $valuesTmp['hash']);
 		} else {
-			$valuesTmp['hashBin'] = pack('H*', $valuesTmp['hash']);	//hex2bin() is PHP5.4+
+			$valuesTmp['hashBin'] = hex2bin($valuesTmp['hash']);
 			$this->updateEntryPrepared->bindParam(':hash', $valuesTmp['hashBin']);
 		}