I've just ran this script and it worked for me:

<?php

include_once ('./ccxt.php');

$exchange = '\\ccxt\\cex';

$exchange = new $exchange ();
if ($exchange->hasFetchOHLCV){
    print_r ($exchange->timeframes);
    // cex supports 1m timeframes only
    $ohlc = $exchange->fetch_ohlcv ('BTC/USD', '1m');
    print_r($ohlc);
}

?>

Does it work for you as well? If so, you should show your verbose output or tell what's inside your $_GET['pair']...

mbp:ccxt igorkroitor$ node examples/js/symbols cex
Instantiating cex exchange (printSymbols @ symbols.js:24)
cex has 21 symbols: BCH/BTC, BCH/EUR, BCH/GBP, BCH/USD, BTC/EUR, BTC/GBP, BTC/RUB, BTC/USD, DASH/BTC, DASH/EUR, DASH/GBP, DASH/USD, ETH/BTC, ETH/EUR, ETH/GBP, ETH/USD, GHS/BTC, ZEC/BTC, ZEC/EUR, ZEC/GBP, ZEC/USD (printSymbols @ symbols.js:37)

limits          | precision       | maker | taker | id       | symbol   | base | quote | info           
--------------------------------------------------------------------------------------------------------
[object Object] | [object Object] | 0     | 0.002 | BCH/BTC  | BCH/BTC  | BCH  | BTC   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | BCH/EUR  | BCH/EUR  | BCH  | EUR   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | BCH/GBP  | BCH/GBP  | BCH  | GBP   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | BCH/USD  | BCH/USD  | BCH  | USD   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | BTC/EUR  | BTC/EUR  | BTC  | EUR   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | BTC/GBP  | BTC/GBP  | BTC  | GBP   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | BTC/RUB  | BTC/RUB  | BTC  | RUB   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | BTC/USD  | BTC/USD  | BTC  | USD   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | DASH/BTC | DASH/BTC | DASH | BTC   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | DASH/EUR | DASH/EUR | DASH | EUR   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | DASH/GBP | DASH/GBP | DASH | GBP   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | DASH/USD | DASH/USD | DASH | USD   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | ETH/BTC  | ETH/BTC  | ETH  | BTC   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | ETH/EUR  | ETH/EUR  | ETH  | EUR   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | ETH/GBP  | ETH/GBP  | ETH  | GBP   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | ETH/USD  | ETH/USD  | ETH  | USD   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | GHS/BTC  | GHS/BTC  | GHS  | BTC   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | ZEC/BTC  | ZEC/BTC  | ZEC  | BTC   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | ZEC/EUR  | ZEC/EUR  | ZEC  | EUR   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | ZEC/GBP  | ZEC/GBP  | ZEC  | GBP   | [object Object]
[object Object] | [object Object] | 0     | 0.002 | ZEC/USD  | ZEC/USD  | ZEC  | USD   | [object Object]

You should pass the symbol to fetchOHLCV...

Uh oh!

CEX - Market orders seem to mix amount with price #564

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