February 11, 2011 
Definition:
function compression_test() {}
Test 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.
Source code
function compression_test() {
?>
<script type="text/javascript">
/* <![CDATA[ */
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+'&'+(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
}
709
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