Description:
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numeric string begining by a zero are casted to int.

for example "0123456" will be output "123456" in the stream.

Test script:
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       $fp = fopen("php://memory", 'wrb+');
       fputcsv($fp, array('0123456'), ';');
       rewind($fp);
       $stream =  stream_get_contents($fp);
       fclose($fp);
       echo $stream;

Expected result:
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Output : "0123456;\n"

Actual result:
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"123456;\n"