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--TEST--
GH-13815 (mb_trim() inaccurate $characters default value)
--EXTENSIONS--
mbstring
--FILE--
<?php
$strUtf8 = "\u{3042}\u{3000}"; // U+3000: fullwidth space
var_dump(mb_strlen(mb_trim($strUtf8)));
var_dump(mb_strlen(mb_trim($strUtf8, encoding: 'UTF-8')));
mb_internal_encoding('Shift_JIS');
$strSjis = mb_convert_encoding($strUtf8, 'Shift_JIS', 'UTF-8');
var_dump(mb_strlen(mb_trim($strSjis)));
var_dump(mb_strlen(mb_trim($strSjis, encoding: 'Shift_JIS')));
?>
--EXPECT--
int(1)
int(1)
int(1)
int(1)
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