Description:
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If you use a numeric array key to represent a numeric field name, cURL will ignore the field completely when submitting the POST.

For example, suppose you have an HTML form containing a field named 'somefield' and another field named '100'. We want to simulate submitting this form using cURL:

When the script below is executed, cURL will submit the form and pass the 'somefield' data, but will completely ignore the '100' data in the form post.

$ch = curl_init('http://www.someurl.com');
curl_setopt($ch, CURLOPT_POST, 1);
$fields['somefield'] = 'Some Data';
$fields['100'] = 'Some Other Data';
curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);
$output = curl_exec($ch);

Test script:
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$ch = curl_init('http://www.someurl.com');
curl_setopt($ch, CURLOPT_POST, 1);
$fields['somefield'] = 'Some Data';
$fields['100'] = 'Some Other Data';
curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);
$output = curl_exec($ch);