PHP using JS pop-up error message garbled

Problem Description: Submit data from the page to the background (non-AJAX submissions), when checking the legitimacy of the data, if there is an error, through the Echo out a section of JS code, error prompts. As follows

echo "";

The popup box will appear garbled.

Problem Analysis: If the browser is set to automatically detect the encoding, there will be no garbled, otherwise, garbled situation may occur. Because the script tag in the JS code is bare-Ben, no coding restrictions, so there will be garbled situation.

Problem solving: Wrap a layer of HTML code outside of the pop-up error message. As follows

$output =<<
 <>
  
 Eof;echo $output;
 

This way, when the error message pops up, there will be no more garbled cases.

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