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+ 1.2.6 - 4 September 2021. Fixes a bug that arises when '$config["deny_attribute"]' has a 'data-*' attribute with > 1 hyphen character
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+ 1.2.5 - 24 September 2019. Fixes two bugs in 'font' tag transformation
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+ 1.2.4.2 - 16 May 2019. Corrects a PHP notice if a semi-colon is present in '$config["schemes"]'
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+ 1.2.4.1 - 12 September 2017. Corrects a function re-declaration bug introduced in version 1.2.4
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+ 1.2.4 - 31 August 2017. Removes use of PHP 'create_function' function and '$php_errormsg' reserved variable (deprecated in PHP 7.2)
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+ 1.2.3 - 5 July 2017. New option value of '4' for '$config["comments"]' to stop enforcing a space character before the '-->' comment-closing marker