compression_test()
Tests support for compressing JavaScript from PHP.
Outputs JavaScript that tests if compression from PHP works as expected and sets an option with the result. Has no effect when the current user is not an administrator. To run the test again the option 'can_compress_scripts' has to be deleted.
No Hooks.
Return
null
. Nothing (null).
Usage
compression_test();
Changelog
Since 2.8.0 | Introduced. |
compression_test() compression test code WP 6.7.1
<?php function compression_test() { ?> <script type="text/javascript"> var compressionNonce = <?php echo wp_json_encode( wp_create_nonce( 'update_can_compress_scripts' ) ); ?>; var testCompression = { get : function(test) { var x; if ( window.XMLHttpRequest ) { x = new XMLHttpRequest(); } else { try{x=new ActiveXObject('Msxml2.XMLHTTP');}catch(e){try{x=new ActiveXObject('Microsoft.XMLHTTP');}catch(e){};} } if (x) { x.onreadystatechange = function() { var r, h; if ( x.readyState == 4 ) { r = x.responseText.substr(0, 18); h = x.getResponseHeader('Content-Encoding'); testCompression.check(r, h, test); } }; x.open('GET', ajaxurl + '?action=wp-compression-test&test='+test+'&_ajax_nonce='+compressionNonce+'&'+(new Date()).getTime(), true); x.send(''); } }, check : function(r, h, test) { if ( ! r && ! test ) this.get(1); if ( 1 == test ) { if ( h && ( h.match(/deflate/i) || h.match(/gzip/i) ) ) this.get('no'); else this.get(2); return; } if ( 2 == test ) { if ( '"wpCompressionTest' === r ) this.get('yes'); else this.get('no'); } } }; testCompression.check(); </script> <?php }