What potential issue arises when a header is included in a PHP file that outputs JSON data?

When a header is included in a PHP file that outputs JSON data, it can cause an error because headers must be sent before any output is generated. To solve this issue, you can use the header() function to set the content type to application/json before outputting any JSON data. 

<?php
// Set the content type header to application/json
header('Content-Type: application/json');

// Output JSON data
echo json_encode($data);
?>

Keywords

header JSON output conflict encoding

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