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use null coalesce to suppress deprecation notice in php 8.1 #6129

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2 changes: 1 addition & 1 deletion system/core/Common.php
Original file line number Diff line number Diff line change
Expand Up @@ -727,7 +727,7 @@ function remove_invisible_characters($str, $url_encoded = TRUE)

do
{
$str = preg_replace($non_displayables, '', $str, -1, $count);
$str = preg_replace($non_displayables, '', $str??'', -1, $count);
}
while ($count);

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