(PECL parle >= 0.7.2)
Parle\RLexer::callout — Define token callback
public Parle\RLexer::callout ( int $id , callable $callback ) : void
Define a callback to be invoked once lexer encounters a particular token.
id
Token id.
callback
Callable to be invoked. The callable doesn't receive any arguments and its return value is ignored.
No value is returned.
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https://www.php.net/manual/en/parle-rlexer.callout.php