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php post data is lost because the "max_input_vars" in "php.ini" defaults to "1000". Just adjust its value to a larger value to solve the post data loss problem.
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PHP POST data loss
$ajax submitted a relatively large data to the background. However, the background analysis printout is always less than half. Some data was not received.
Look at the json returned locally, there is a warning.
Actually, this is because max_input_vars in php.ini defaults to 1000. Just adjust it a little bigger.
This is newly added in php5.3.9 version.
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