D21541.id51275.diff
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D21541.id51275.diff
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	diff --git a/src/xsprintf/xsprintf.php b/src/xsprintf/xsprintf.php
	--- a/src/xsprintf/xsprintf.php
	+++ b/src/xsprintf/xsprintf.php
	@@ -67,6 +67,18 @@
	}

	if ($callback !== null) {
	+
	+ // See T13588 and D21500. This function uses "$callback()", instead
	+ // of "call_user_func()", to simplify reference behavior: some of
	+ // these arguments must be passed by reference.
	+
	+ // Prior to PHP7, this syntax will not work if "$callback" is a
	+ // string referencing a static method, like "C::m".
	+
	+ // This syntax does work if "$callback" is an array referencing
	+ // a static method, like "array('C', 'm')", in all versions of PHP
	+ // since PHP 5.4.
	+
	$callback($userdata, $pattern, $pos, $argv[$arg], $len);
	}
	}