Drop compatibility with PHP 5.6, 7.0 and 7.1

[enricobattocchi]

Context

Summary

This PR can be summarized in the following changelog entry:

• Drops compatibility with PHP 5.6, 7.0 and 7.1.

Relevant technical choices:

• Note that this addon doesn't have any requirement to Yoast SEO so we won't need to update any reference to the Free feature branch.

Test instructions

Test instructions for the acceptance test before the PR gets merged

This PR can be acceptance tested by following these steps:

• Verify the GH actions pass
• install on a PHP 5.6 environment
• visit the Plugins page
• see that you get the same message and you can't activate the plugin, as it happens here for Free and Premium:
• the same should happen with 7.0 and 7.1

note: the above may be tricky to test. I can see 5.6 as a choice in Local by Flywheel, but I know it's not the case for others (and I can see 7.0 an 7.1 are not available - neither 7.2 actually) I tried on Instawp, where you have the full choice of PHP versions, but when uploading the artifact I got: which is also a nice thing to check, actually.

So a way could be:

• start a 7.2 site on instawp
• upload the artifact but don't activate it
• switch to 5.6
• check that you get the same message above and you can't activate the plugin
• switch to 7.0 an 7.1
• the same should happen

Relevant test scenarios

• [ ] Changes should be tested with the browser console open
• [ ] Changes should be tested on different posts/pages/taxonomies/custom post types/custom taxonomies
• [ ] Changes should be tested on different editors (Block/Classic/Elementor/other)
• [ ] Changes should be tested on different browsers
• [ ] Changes should be tested on multisite

Test instructions for QA when the code is in the RC

• [ ] QA should use the same steps as above.

QA can test this PR by following these steps:

*

Impact check

This PR affects the following parts of the plugin, which may require extra testing:

*

UI changes

• [ ] This PR changes the UI in the plugin. I have added the 'UI change' label to this PR.

Documentation

• [ ] I have written documentation for this change.

Quality assurance

• [ ] I have tested this code to the best of my abilities
• [ ] I have added unittests to verify the code works as intended

Innovation

• [x] No innovation project is applicable for this PR.
• [ ] This PR falls under an innovation project. I have attached the innovation label and noted the work hours.

Fixes https://github.com/Yoast/wordpress-seo/issues/19801

[private-packagist[bot]]

composer.lock

Dev Package changes

Package	Operation	From	To	Changes
phar-io/manifest	add	-	2.0.3	view code
phar-io/version	add	-	3.2.1	view code
sebastian/object-reflector	add	-	1.1.2	view code
sebastian/type	add	-	1.1.4	view code
theseer/tokenizer	add	-	1.2.1	view code
antecedent/patchwork	upgrade	2.1.21	2.1.25	diff
doctrine/instantiator	upgrade	1.0.5	1.5.0	diff
myclabs/deep-copy	upgrade	1.7.0	1.11.1	diff
phpunit/php-code-coverage	upgrade	4.0.8	7.0.15	diff
phpunit/php-file-iterator	upgrade	1.4.5	2.0.5	diff
phpunit/php-timer	upgrade	1.0.9	2.1.3	diff
phpunit/php-token-stream	upgrade	1.4.12	3.1.3	diff
phpunit/phpunit	upgrade	5.7.27	8.5.33	diff
sebastian/comparator	upgrade	1.2.4	3.0.5	diff
sebastian/diff	upgrade	1.4.3	3.0.3	diff
sebastian/environment	upgrade	2.0.0	4.2.4	diff
sebastian/exporter	upgrade	2.0.0	3.1.5	diff
sebastian/global-state	upgrade	1.1.1	3.0.2	diff
sebastian/object-enumerator	upgrade	2.0.1	3.0.4	diff
sebastian/recursion-context	upgrade	2.0.0	3.0.1	diff
sebastian/resource-operations	upgrade	1.0.0	2.0.2	diff
squizlabs/php_codesniffer	upgrade	3.7.1	3.7.2	diff
yoast/yoastcs	upgrade	2.3.0	2.3.1	diff
phpdocumentor/reflection-common	remove	1.0.1	-	-
phpdocumentor/reflection-docblock	remove	3.3.2	-	-
phpdocumentor/type-resolver	remove	0.4.0	-	-
phpspec/prophecy	remove	v1.10.3	-	-
phpunit/phpunit-mock-objects	remove	3.4.4	-	-
symfony/polyfill-ctype	remove	v1.19.0	-	-
symfony/yaml	remove	v3.4.47	-	-
webmozart/assert	remove	1.9.1	-	-

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