Merge pull request #1042 from mike42/php8-compat

Change supported php versions, apply 8.0 fixes and build environment changes

Author: mike42

.travis.yml

@@ -1,15 +1,13 @@
 ---
-dist: trusty
+dist: xenial
 sudo: required
 
 language: php
 
 php:
-  - 7.0
-  - 7.1
-  - 7.2
-  - 7.3
-  - 7.4
+  - '7.3'
+  - '7.4'
+  - '8.0'
   - nightly
 
 matrix:
@@ -25,7 +23,7 @@ install:
 
 before_script:
   # Install 'imagick' plugin
-  - bash -c 'if [[ $TRAVIS_PHP_VERSION != hhvm* ]]; then printf "\n" | pecl install imagick; fi'
+  - bash -c 'if [[ $TRAVIS_PHP_VERSION != 8* ]] && [[ $TRAVIS_PHP_VERSION != "nightly" ]] ; then printf "\n" | pecl install imagick; fi'
   # Directory for coverage report
   - mkdir -p build/logs/
 

README.md

@@ -178,7 +178,7 @@ If you haven't used `composer` before, you can read about it at [getcomposer.org
 
 This project has few hard dependencies:
 
-- PHP 7.0 or newer.
+- PHP 7.3 or newer.
 - `json` extension, used to load bundled printer definitions (see [documentation](https://www.php.net/manual/en/book.json.php))
 - `intl` extension, used for character encoding (see [documentation](https://www.php.net/manual/en/book.intl.php))
 - `zlib` extension, used for de-compressing bundled resources (see [documentation](https://www.php.net/manual/en/book.zlib.php)).
@@ -552,7 +552,7 @@ This code is MIT licensed, and you are encouraged to contribute any modification
 
 For development, it's suggested that you load `imagick`, `gd` and `Xdebug` PHP extensions.
 
-The tests are executed on [Travis CI](https://travis-ci.org/mike42/escpos-php) over PHP 7.0, 7.1, 7.2 and 7.3. Older versions of PHP are not supported in current release, nor is HHVM.
+The tests are executed on [Travis CI](https://travis-ci.org/mike42/escpos-php) over PHP 7.3, 7.4 and 8.0. Older versions of PHP are not supported in the current release, nor is HHVM.
 
 Fetch a copy of this code and load dependencies with composer:
 

composer.json

@@ -18,11 +18,11 @@
 	],
 	"config": {
 		"platform": {
-			"php": "7.0.0"
+			"php": "7.3.0"
 		}
 	},
 	"require" : {
-		"php" : ">=7.0.0",
+		"php" : ">=7.3.0",
 		"ext-json": "*",
 		"ext-intl": "*",
 		"ext-zlib": "*",
@@ -33,7 +33,7 @@
 		"ext-gd" : "Used for image printing if present."
 	},
 	"require-dev" : {
-		"phpunit/phpunit" : "^6.5",
+		"phpunit/phpunit" : "^9",
 		"squizlabs/php_codesniffer" : "^3.3"
 	},
 	"autoload" : {