styleTest.css.php

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<?php
header( 'Content-Type: text/css; charset=utf-8' );
 
function cssfilter( $val ) {
    return preg_replace( '/[^A-Za-z0-9\.\- #]/', '', $val );
}
 
// Do basic sanitization
$params = array_map( 'cssfilter', $_GET );
 
// Defaults
$selector = isset( $params['selector'] ) ? $params['selector'] : '.mw-test-example';
$property = isset( $params['prop'] ) ? $params['prop'] : 'float';
$value = isset( $params['val'] ) ? $params['val'] : 'right';
$wait = isset( $params['wait'] ) ? (int)$params['wait'] : 0; // seconds
 
sleep( $wait );
 
$css = "
$selector {
    $property: $value;
}
";
 
echo trim( $css ) . "\n";