Introduce new PHP cross-version compatibility functions, `str_ends_with()`

[pbiron]

PHP 8 added a ​str_ends_with() function.

It would be good to add a polypill for it to core, so that plugins that use it will work on sites running PHP < 8.

I'll do a patch with unit tests tomorrow.

Related: #45055, #49652

[hellofromTonya]

Accepting this feature as it can be bundled with the other PHP polyfills.

[pbearne]

there is a str_starts_with()

[pbiron]

Thanx @pbearne! (hi, by the way :-)

I was just coming to add a comment that I will also include a polyfill for str_starts_with() as well.

Trac ticket: https://core.trac.wordpress.org/ticket/54377

[pbiron]

@pbearne Thanx for the PR Paul. I just made a few comments/suggestions for corrections to it.

@hellofromTonya Would appreciate you also looking at those comments.

[hellofromTonya]

Thanks @pbiron for the ping. Did a thorough review. Ready for commit.

[hellofromTonya]

In 52040:

General: Introduce polyfills for str_ends_with() and str_starts_with() added in PHP 8.0.

PHP 8.0 introduced two new functions: str_ends_with() and str_starts_with(). These perform a case-sensitive check indicating if the string to search in (haystack) ends or begins with the given substring (needle).

These polyfills make these functios available for use in Core.

Ref:

• PHP RFC ​https://wiki.php.net/rfc/add_str_starts_with_and_ends_with_functions
• PHP manual str_ends_with() ​https://www.php.net/manual/en/function.str-ends-with.php
• PHP manual str_starts_with() ​https://www.php.net/manual/en/function.str-starts-with.php

Props costdev, hellofromTonya, pbearne, pbiron.
Fixes #54377.

Committed via changeset https://core.trac.wordpress.org/changeset/52040.

[hellofromTonya]

Thank you everyone for your contributions! These functions are now available for use in Core.