(PECL event >= 1.6.0)
EventBuffer::substr — Substracts a portion of the buffer data
public EventBuffer::substr ( int $start [, int $length ] ) : string
Substracts up to length
bytes of the buffer data beginning at start
position.
start
The start position of data to be substracted.
length
Maximum number of bytes to substract.
Returns the data substracted as a string on success, or false
on failure.
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https://www.php.net/manual/en/eventbuffer.substr.php