Description:
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You can get into problems with number-like strings. 

For example, phones with trailing zeros 056033023 don't get quoted in the generated csv file. So, a workaround for that could be add an extra space character before the real value.

Reproduce code:
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From manual page: function.fputcsv
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$csv_data = array();
$csv_data[] = '021323123';   // Includes trailing zeros
fputcsv ($fd, $csv_data);


Expected result:
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Phone field keeps trailing zeros

Actual result:
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Phone field gets zeros removed cause interpreted as integer instead of string