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[STDERR] PHP Strict Standards: Non-static method utf_normalizer::nfc() should not be called statically in includes/utf/utf_tools.php on line 1781\n

replace:
utf_normalizer::nfc($strings);

by:
$utf_normalizer = new utf_normalizer();
$utf_normalizer->nfc($strings);
unset($utf_normalizer);

----------------

[STDERR] PHP Strict Standards: Non-static method utf_normalizer::nfkc() should not be called statically in includes/utf/utf_tools.php on line 1663\n

replace:
utf_normalizer::nfkc($text);

by:
$utf_normalizer = new utf_normalizer();
$utf_normalizer->nfkc($text);
unset($utf_normalizer);

---------------

[STDERR] PHP Strict Standards: Non-static method utf_normalizer::nfc() should not be called statically in includes/utf/utf_tools.php on line 1803\n

replace:
utf_normalizer::nfc($strings[$key]);

by:
$utf_normalizer = new utf_normalizer();
$utf_normalizer->nfc($strings[$key]);
unset($utf_normalizer);

a few lines up is line that seems to be producing similar error, replace:
utf_normalizer::nfc($strings[$key][$_key]);

by:
$normalizer = new utf_normalizer(); // Create an instance
$result = $normalizer->nfc($strings[$key][$_key]); // Call the method on the instance