Improve performance in the WP_Theme_JSON class by simplifying calls to array functions#3555

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aristath wants to merge 25 commits intoWordPress:trunkfrom

jrfnl:feature/pp-ari-wp-theme-json

Commits on Nov 8, 2022

WIP

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WIP step 2

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WIP - step 3

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WIP Step 3b

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WIP - setp 4

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WIP - simplify it a little more

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WIP - step 5

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WIP - side step 6

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WIP - side step 7

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CS & cleanup
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replace array_key_exists with isset
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replace an array_merge with a foreach loop
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Add an inline comment to avoid future refactors
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We can use isset() instead of array_key_exists() here (no null values)
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replace array_merge with a foreach loop
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replace array_merge with foreach loop in the flatten_tree method
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replace array_key_exists() with isset()
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Replace more array_merge with foreach loops where appropriate
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Fix PHP 5.6 errors + added notes for the future
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Commits on Nov 11, 2022