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Description

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.

Usage

compression_test();

Parameters

Returns

void

Source

File name: wordpress/wp-admin/includes/template.php
Lines:

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
}
 

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