Description:
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On page http://ca.php.net/manual/en/function.number-format.php the example code is incorrect because the number 1234.56 is rounded up to 1235 when you pass number_format only one parameter.

For example the code below will output 1235.

$number = 1234.56;
//english notation(default)
echo number_format($number)."<br />";
echo "should be 1,234 as per the example code on page";

You should modify the example code on that page to reflect reality.

Reproduce code:
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$number = 1234.56;
//english notation(default)
echo number_format($number)."<br />";
echo "should be 1,234 as per the example code on page";

Expected result:
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1235