Determine whether the page or image has been compressed by gzip through php

Use php to determine whether the page or image has been compressed by gzip

1. Use get_headers

Page content

'one','value'=>1), array('name'=>'two','value'=>2), array('name'=>'three','value'=>3) ); header('content-type:application/json');echo json_encode($data);?>

Use get_headers to determine whether to use gzip compression

Test results:
Whenob_gzhandleris added,trueis returned , return after deletionfalse

2. Use curl

Picture

Use curl to judge Whether to use gzip compression

Test results:
Whenob_gzhandleris added,trueis returned, and returned after deletionfalse

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