fix: test if gzip extension is available

[stklcode]

If zlib PHP extension is not loaded and there is no substitute in place, gzencode() does not exist and generation of compressed files will fail.

Add a simple function_exists() test to prevent this.

[stklcode]

It might seem little far fetched, but providing the function_exists result as default filter parameter allows to implement some logic to define this function on demand, e.g.

add_filter( 'cachify_create_gzip_files', function ( $available ) {
  if ( ! $available ) {
    // Define or load anything that implements gzencode.
    function gzencode( $data, $level ) {
      return $data;
    }
  }

  return true;
} );

[stklcode]

In the current suggestion: Yes, you can still override the false with a filter, if gzencode is not available.

One might polyfill another compression routine on demand in the filter hook (see example above). Seems more of a theoretical possibility though.

But I'd be fine changing the logic again, so the filter is completely omitted if gzencode is not available. No hard preference for either way.

[stklcode]

I changed the logic, so if gzencode is not available we disable the feature and do not execute the filter.

This is trivial to change again, but >99.9% should not need such tricky configurations.

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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