whats a valid php function name character

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what's a valid php function name character? - 

Für Funktionsnamen gelten in PHP die gleichen Regeln wie für andere Bezeichner.
Ein gültiger Funktionsname beginnt mit einem Buchstaben oder Unterstrich gefolgt von einer beliebigen Anzahl von Buchstaben, Ziffern und Unterstrichen.
Als regulärer Ausdruck wird dies so ausgedrückt: ^[a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*$.

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