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$callback = create_function('$matches', 'return strtoupper($matches[1]);');

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$callback = function($matches) use ($callback) {
							return $callback . strtoupper($matches[1]);
						}

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$callbacks[$delimiter] = create_function('$matches', "return '$delimiter' . strtolower(\$matches[1]);");

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$callbacks[$delimiter] = function($matches) use ($delimiter) {
					return $delimiter . strtolower($matches[1]);
				}

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$codes = array_map(create_function('$validationError', 'return $validationError->code;'), $validationErrors);

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$codes = array_map(function($matches) use ($validationError) { return $validationError->code; }, $validationErrors);

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Uncaught ReferenceError: braintree is not defined
    at Object.success (<anonymous>:37:5)
    at u (jquery-3.3.1.min.js:2)
    at Object.fireWith [as resolveWith] (jquery-3.3.1.min.js:2)
    at k (jquery-3.3.1.min.js:2)
    at HTMLScriptElement.n (jquery-3.3.1.min.js:2)
    at HTMLScriptElement.dispatch (jquery-3.3.1.min.js:2)
    at HTMLScriptElement.y.handle (jquery-3.3.1.min.js:2)

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  $.getScript('https://js.braintreegateway.com/web/3.6.3/js/client.min.js', function() {
    $.getScript('https://js.braintreegateway.com/web/3.6.3/js/hosted-fields.min.js');
    $.getScript('https://js.braintreegateway.com/web/3.6.3/js/data-collector.min.js');
        
    braintree.client.create({
      authorization: 'XXXX'
    }, function (client_error, braintree_client) {
      console.log("Create Client");

      if (client_error) {
        console.error(client_error);
        return;
      }

      client_instance = braintree_client;

      
      braintree.hostedFields.create({
        client: braintree_client,
        styles: "{\n\t\t  'input': { 'font-size': '12px', 'font-family': 'Source Sans Pro, sans-serif', 'color': '#7A8494' },\n\t\t  'input.invalid': { 'color': 'red' },\n\t\t  'input.valid': { 'color': 'green' }\n\t  \t}",
        fields: {
          number: {
            selector: '#input-card-number',
            placeholder: '1111 1111 1111 1111'
          },
          expirationMonth: {
            selector: '#input-card-expiration-month',
            placeholder: 'Month',
            select: true
          },
          expirationYear: {
            selector: '#input-card-expiration-year',
            placeholder: 'Year',
            select: true
          },
          cvv: {
            selector: '#input-card-cvv',
            placeholder: 'CVV2',
            type: "password"
          }
        }
      }, hostedCallback);

      braintree.dataCollector.create({
        client: braintree_client,
        kount: true,
        paypal: true
      }, dataCollectorCallback);

          });
  });