Write and review PHP that must parse on PHP 7.2–7.4 (treat 7.4 as the default). Use when editing PHP, Composer, PHPUnit, or Laravel 5–7 in a tree whose pin is major 7. Never together with php8. Never emit PHP 8 syntax (match, named arguments, constructor property promotion, union types, mixed, attributes, enums, readonly, nullsafe, str_contains).
