Declare PHP version requirement in all Composer packages

This makes for a better experience for third parties using the packages,
as they can see on Packagist which PHP versions the package is supposed
to support.

Also this is a good excuse to make a major version bump for all the
packages following #34126 which removed testing with PHP 5.6 and allows
use of 7.0+ features going forward.

And since we're making systematic use of declared PHP versions now,
let's lint for that and make use of it to skip phpunit tests where
appropriate.

.github/files/lint-project-structure.sh

@@ -7,6 +7,7 @@ cd $(dirname "${BASH_SOURCE[0]}")/../..
 BASE=$PWD
 . "$BASE/tools/includes/check-osx-bash-version.sh"
 . "$BASE/tools/includes/chalk-lite.sh"
+. "$BASE/.github/versions.sh"
 
 if [[ -n "$CI" ]]; then
 	function debug {
@@ -226,6 +227,13 @@ for PROJECT in projects/*/*; do
 		echo "::error file=$PROJECT/composer.json::Package $SLUG should set \`.extra.branch-alias.dev-trunk\` in composer.json."
 	fi
 
+	# - Packages must set `.require.php`.
+	if [[ "$TYPE" == "packages" ]] && ! jq -e '.require.php // null' "$PROJECT/composer.json" >/dev/null; then
+		EXIT=1
+		LINE=$(jq --stream -r 'if length == 1 then .[0][:-1] else .[0] end | if . == ["require"] then ",line=\( input_line_number )" else empty end' "$PROJECT/composer.json")
+		echo "::error file=$PROJECT/composer.json$LINE::Package $SLUG should set \`.require.php\` in composer.json (probably to \">=$MIN_PHP_VERSION\")."
+	fi
+
 	SUGGESTION="You might add this with \`composer config autoloader-suffix '$(printf "%s" "$SLUG" | md5sum | sed -e 's/[[:space:]]*-$//')_$(sed -e 's/[^0-9a-zA-Z]/_/g' <<<"${SLUG##*/}")ⓥversion'\` in the appropriate directory."
 
 	# - If vendor/autoload.php or vendor/autoload_packages.php is production-included, composer.json must set .config.autoloader-suffix.
@@ -453,7 +461,6 @@ for FILE in $(git -c core.quotepath=off ls-files 'projects/packages/**/.eslintrc
 done
 
 # - .nvmrc should match .github/versions.sh.
-. .github/versions.sh
 debug "Checking .nvmrc vs versions.sh"
 if [[ "$(<.nvmrc)" != "$NODE_VERSION" ]]; then
 	EXIT=1

.github/workflows/tests.yml

@@ -135,6 +135,8 @@ jobs:
               echo "Skipping $SLUG, no changes in it or its dependencies"
             elif ! jq --arg script "$TEST_SCRIPT" -e '.scripts[$script] // false' "$P" > /dev/null; then
               echo "Skipping $SLUG, no test script is defined in composer.json"
+            elif php -r 'exit( preg_match( "/^>=\\s*(\\d+\\.\\d+)$/", $argv[1], $m ) && version_compare( PHP_VERSION, $m[1], "<" ) ? 0 : 1 );' "$( jq -r '.require.php // ""' "$P" )"; then
+              echo "Skipping $SLUG, requires PHP $( jq -r '.require.php // ""' "$P" ) but PHP version is $( php -r 'echo PHP_VERSION;' )"
             else
               if jq --arg script "skip-$TEST_SCRIPT" -e '.scripts[$script] // false' "$P" > /dev/null; then
                 { composer --working-dir="$DIR" run "skip-$TEST_SCRIPT"; CODE=$?; } || true

projects/packages/a8c-mc-stats/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/a8c-mc-stats/composer.json

@@ -3,7 +3,9 @@
 	"description": "Used to record internal usage stats for Automattic. Not visible to site owners.",
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
-	"require": {},
+	"require": {
+		"php": ">=7.0"
+	},
 	"require-dev": {
 		"yoast/phpunit-polyfills": "1.1.0",
 		"automattic/jetpack-changelogger": "@dev"

projects/packages/abtest/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/abtest/composer.json

@@ -4,6 +4,7 @@
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
 	"require": {
+		"php": ">=7.0",
 		"automattic/jetpack-connection": "@dev",
 		"automattic/jetpack-error": "@dev"
 	},

projects/packages/action-bar/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/action-bar/composer.json

@@ -4,6 +4,7 @@
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
 	"require": {
+		"php": ">=7.0",
 		"automattic/jetpack-assets": "@dev",
 		"automattic/jetpack-constants": "@dev"
 	},

projects/packages/admin-ui/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/admin-ui/composer.json

@@ -3,7 +3,9 @@
 	"description": "Generic Jetpack wp-admin UI elements",
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
-	"require": {},
+	"require": {
+		"php": ">=7.0"
+	},
 	"require-dev": {
 		"yoast/phpunit-polyfills": "1.1.0",
 		"automattic/jetpack-changelogger": "@dev",

projects/packages/analyzer/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/analyzer/composer.json

@@ -8,6 +8,7 @@
 		"static analysis"
 	],
 	"require": {
+		"php": ">=7.0",
 		"nikic/php-parser": "4.13.2"
 	},
 	"require-dev": {

projects/packages/assets/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/assets/composer.json

@@ -4,6 +4,7 @@
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
 	"require": {
+		"php": ">=7.0",
 		"automattic/jetpack-constants": "@dev"
 	},
 	"require-dev": {

projects/packages/autoloader/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/autoloader/composer.json

@@ -12,6 +12,7 @@
 		"wordpress"
 	],
 	"require": {
+		"php": ">=7.0",
 		"composer-plugin-api": "^1.1 || ^2.0"
 	},
 	"require-dev": {

projects/packages/backup/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/backup/composer.json

@@ -4,6 +4,7 @@
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
 	"require": {
+		"php": ">=7.0",
 		"automattic/jetpack-assets": "@dev",
 		"automattic/jetpack-admin-ui": "@dev",
 		"automattic/jetpack-autoloader": "@dev",

projects/packages/blaze/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/blaze/composer.json

@@ -4,6 +4,7 @@
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
 	"require": {
+		"php": ">=7.0",
 		"automattic/jetpack-assets": "@dev",
 		"automattic/jetpack-connection": "@dev",
 		"automattic/jetpack-constants": "@dev",

projects/packages/blocks/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/blocks/composer.json

@@ -4,6 +4,7 @@
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
 	"require": {
+		"php": ">=7.0",
 		"automattic/jetpack-constants": "@dev"
 	},
 	"require-dev": {

projects/packages/boost-core/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/boost-core/composer.json

@@ -3,7 +3,9 @@
 	"description": "Core functionality for boost and relevant packages to depend on",
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
-	"require": {},
+	"require": {
+		"php": ">=7.0"
+	},
 	"require-dev": {
 		"yoast/phpunit-polyfills": "1.1.0",
 		"automattic/jetpack-changelogger": "@dev",

projects/packages/boost-speed-score/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/boost-speed-score/composer.json

@@ -14,6 +14,7 @@
 		}
 	},
 	"require": {
+		"php": ">=7.0",
 		"automattic/jetpack-boost-core": "@dev"
 	},
 	"autoload": {

projects/packages/chatbot/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/chatbot/composer.json

@@ -3,7 +3,9 @@
 	"description": "Helpful chatbots for you and your visitors",
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
-	"require": {},
+	"require": {
+		"php": ">=7.0"
+	},
 	"require-dev": {
 		"yoast/phpunit-polyfills": "1.1.0",
 		"automattic/jetpack-changelogger": "@dev",

projects/packages/codesniffer/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: patch
+Type: added
+
+Declare requirement of PHP >= 7.4.

projects/packages/codesniffer/composer.json

@@ -12,6 +12,7 @@
 		"testing"
 	],
 	"require": {
+		"php": ">=7.4",
 		"dealerdirect/phpcodesniffer-composer-installer": "^1.0",
 		"mediawiki/mediawiki-codesniffer": "^41.0",
 		"phpcompatibility/phpcompatibility-wp": "^2.1",
@@ -35,9 +36,6 @@
 		"phpunit": [
 			"./vendor/phpunit/phpunit/phpunit --colors=always"
 		],
-		"skip-test-php": [
-			"./tests/action-skip-test-php.sh"
-		],
 		"test-php": [
 			"@composer phpunit"
 		]

projects/packages/compat/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/compat/composer.json

@@ -3,7 +3,9 @@
 	"description": "Compatibility layer with previous versions of Jetpack",
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
-	"require": {},
+	"require": {
+		"php": ">=7.0"
+	},
 	"require-dev": {
 		"automattic/jetpack-changelogger": "@dev"
 	},

projects/packages/composer-plugin/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/composer-plugin/composer.json

@@ -10,6 +10,7 @@
 		"i18n"
 	],
 	"require": {
+		"php": ">=7.0",
 		"composer-plugin-api": "^2.1.0"
 	},
 	"require-dev": {

projects/packages/config/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/config/composer.json

@@ -3,7 +3,9 @@
 	"description": "Jetpack configuration package that initializes other packages and configures Jetpack's functionality. Can be used as a base for all variants of Jetpack package usage.",
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
-	"require": {},
+	"require": {
+		"php": ">=7.0"
+	},
 	"require-dev": {
 		"automattic/jetpack-changelogger": "@dev"
 	},

projects/packages/connection/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/connection/composer.json

@@ -4,6 +4,7 @@
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
 	"require": {
+		"php": ">=7.0",
 		"automattic/jetpack-a8c-mc-stats": "@dev",
 		"automattic/jetpack-admin-ui": "@dev",
 		"automattic/jetpack-constants": "@dev",

projects/packages/constants/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/constants/composer.json

@@ -3,7 +3,9 @@
 	"description": "A wrapper for defining constants in a more testable way.",
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
-	"require": {},
+	"require": {
+		"php": ">=7.0"
+	},
 	"require-dev": {
 		"brain/monkey": "2.6.1",
 		"yoast/phpunit-polyfills": "1.1.0",

projects/packages/device-detection/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/device-detection/composer.json

@@ -3,7 +3,9 @@
 	"description": "A way to detect device types based on User-Agent header.",
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
-	"require": {},
+	"require": {
+		"php": ">=7.0"
+	},
 	"require-dev": {
 		"yoast/phpunit-polyfills": "1.1.0",
 		"automattic/jetpack-changelogger": "@dev"

projects/packages/error/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/error/composer.json

@@ -3,7 +3,9 @@
 	"description": "Jetpack Error - a wrapper around WP_Error.",
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
-	"require": {},
+	"require": {
+		"php": ">=7.0"
+	},
 	"require-dev": {
 		"yoast/phpunit-polyfills": "1.1.0",
 		"automattic/jetpack-changelogger": "@dev"

projects/packages/forms/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/forms/composer.json

@@ -4,6 +4,7 @@
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
 	"require": {
+		"php": ">=7.0",
 		"automattic/jetpack-blocks": "@dev",
 		"automattic/jetpack-assets": "@dev",
 		"automattic/jetpack-connection": "@dev",

projects/packages/google-fonts-provider/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/google-fonts-provider/composer.json

@@ -3,7 +3,9 @@
 	"description": "WordPress Webfonts provider for Google Fonts",
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
-	"require": {},
+	"require": {
+		"php": ">=7.0"
+	},
 	"require-dev": {
 		"yoast/phpunit-polyfills": "1.1.0",
 		"automattic/jetpack-changelogger": "@dev",

projects/packages/heartbeat/changelog/add-declare-php-version-for-all-composer-packages

@@ -0,0 +1,4 @@
+Significance: major
+Type: changed
+
+The package now requires PHP >= 7.0.

projects/packages/heartbeat/composer.json

@@ -4,6 +4,7 @@
 	"type": "jetpack-library",
 	"license": "GPL-2.0-or-later",
 	"require": {
+		"php": ">=7.0",
 		"automattic/jetpack-connection": "@dev"
 	},
 	"require-dev": {