php - JSON Export Function -

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i have little situation. created function should let me export arrays in json format.

this code far:

function export( $option_values ) { $json = json_encode( $option_values ); $filename= '_' . date('y-m-d_h.i.s', time()); $filename= '_wp-' . get_bloginfo('version'); $filename= '.json'; header( "content-disposition: attachment; filename='$filename'" ); header( 'content-type: text/json'); header( 'content-length: ' . mb_strlen( $json ) ); header( 'connection: close');

i error message:

warning: cannot modify header information - headers sent.

how can complete task?

somewhere in code outputting something. can intentional (with statements echo, print, etc.), or unintentional loading php-script linefeed after closing php-tag (?>).

remove output , go.


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