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--TEST--
Bug #77853: Inconsistent substr_compare behaviour with empty haystack
--FILE--
<?php
var_dump(substr_compare('', '', 0, 0));
var_dump(substr_compare('', '', 0));
var_dump(substr_compare('abc', '', 3, 0));
var_dump(substr_compare('abc', '', 3));
var_dump(substr_compare('abc', "\0", 3));
?>
--EXPECT--
int(0)
int(0)
int(0)
int(0)
int(-1)
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