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run code in 200+ php & hhvm versions
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<?php $itemId='802665026'; $path='/categories/9/params/search'; $key='XcyLEIoAuUgGSJUDFAs4xWTnV2TKEmvZTZuTtPFr'; $secret='LLI1/E9&zfG-wwKTRd[XGFOAH~u.pnEJ{q(=oyAG'; $deviceId='d6040f57b3ba61d2'; $payload=array(); $payload['deviceId']=$deviceId; //$payload['session']='3be05bdbec8c3ba50d31e175b5dd3cec.1467179011'; $payload=http_build_query($payload); $sum=md5(md5($secret.'dcdab8661c51092c02cf1ec995ca116c').md5($path).md5($payload)); echo 'https://www.avito.ru/api/4'.$path.'?checksum='.$sum.'&'.$payload.'&key='.$key; //echo 'Checksum for '.$itemId.' is '.$sum; ?>
based on 45SX9
Output for 5.6.0 - 5.6.38, hhvm-3.12.14 - 3.22.0, 7.0.0 - 7.3.1
https://www.avito.ru/api/4/categories/9/params/search?checksum=69834d55f6604d79e2644f2615687f82&deviceId=d6040f57b3ba61d2&key=XcyLEIoAuUgGSJUDFAs4xWTnV2TKEmvZTZuTtPFr