gistfile1.php

<?php

//requires https://github.com/netdna/netdnarws-php
require_once('netdnarws-php/NetDNA.php');

//place your alias, key, secret into this constructor
$api = new NetDNA("{alias}","{consumer_key}","{consumer_secret}");

function purgeCacheFileFromCDN($id, $files = null) {

    global $api;
    //3 options for purge
    $result = null;
    
    if ($files == null){
        $result = $api->delete('/zones/pull.json/'.$id.'/cache');
    } else if (!is_array($files)){
        //Purge single file
        $params = array('file'=>$files);
        $result = $api->delete('/zones/pull.json/'.$id.'/cache',$params);
    } else if (is_array($files)){
        //Purge multiple files
        $params = array();
        foreach ($files as $k=>$v) $params[$k] = $v;
        $result = $api->delete('/zones/pull.json/'.$id.'/cache',$params);
    }

    $result = json_decode($result,true);
    if ($result['code'] != 200) {
        echo 'Error reported: '.print_r( $result, 1 );
    } else {
        echo "Done\n";
    }

}

//set zone id that you want to purge
$zone_id = '{zone_id}';

//Purge complete zone
$files = null; 

// or purge single file
//$files = '/{somefile.extension}';

// or purge multiple, specific files
//$files = array('file0' => '/{file.extension}','file1' => '/{file2.extension}', ... );

echo "Attempting to purge: ".$zone_id.": ";
purgeCacheFileFromCDN( $zone_id, $files );