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UPDATE: Broken for "download" options, still works for "store" and "inline display" options.
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As the title says, PHP 7.2 breaks TCPDF. It generated a deprecated warning, and that output stops TCPDF from continuing. I get the following error:

Deprecated: The each() function is deprecated. This message will be suppressed on further calls in /path/public_html/site.com.au/libraries/cetcpdf/tcpdf/tcpdf.php on line 20947
TCPDF ERROR: Some data has already been output, can't send PDF file

Hi healyhatman,
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Presumably that is a PHP Warning message that is not shown if Site Error Reporting is set to System Default?
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It looks as if Max is using an old TCPDF version 5.9.137 - the latest appears to be 6.2.17
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Bob

Hi,
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The latest TCPDF library file available for download should fix this!
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Best regards,
Max

DUUUUDE! Thankyou! By updating TCPDF you have also finally enabled support for Base64 encoded images! Can now save signatures directly to pdfs without needing to save as png/jpeg first!