Description:
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function return wrong result between 2 dates 2008-03-30 -> 2008-03-31.
PHP version : 5.2.3

Reproduce code:
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$ddebut = "2008-03-30";
$dfin   = "2008-03-31";
	
$tab_ddebut = explode("-", $ddebut);
$tab_dfin   = explode("-", $dfin);

$timestamp_ddebut = mktime(0, 0, 0, $tab_ddebut[1], $tab_ddebut[2], $tab_ddebut[0]);
$timestamp_dfin	  = mktime(0, 0, 0, $tab_dfin[1], $tab_dfin[2], $tab_dfin[0]);

echo abs(($timestamp_dfin - $timestamp_ddebut)/86400);


Expected result:
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this code abs(($timestamp_dfin - $timestamp_ddebut)/86400) return wrong result : 0.958333333333. the correct result is 1.

Actual result:
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0.958333333333