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What PHP functions are removed in PHP 7/8?
PHP 7: mysql_*, ereg/eregi/split, mcrypt, call-time pass-by-reference. PHP 8: each(), create_function(), dynamic property creation deprecated.
How should I migrate mysql_* to PDO?
Replace mysql_connect() with new PDO(). Use prepared statements: $stmt = $pdo->prepare($sql); $stmt->execute([$param]); $row = $stmt->fetch(PDO::FETCH_ASSOC). The converter flags mysql_* with PDO pattern comments.
What new syntax does PHP 8 add?
PHP 8.0: named arguments, match expressions, nullsafe (?->), str_contains/str_starts_with/str_ends_with, union types, constructor promotion. PHP 8.1: enums, readonly properties. PHP 8.2: readonly classes.