通过简单的代码，比较php中sort，natsort和usort的不同。
<html>
<head>
<style type="text/css">
li{
border:2px solid black;
padding: 0.5em;
width: auto;
margin: 0.5em;
}
p{
font-size: 20px;
color: blue;
}
ol li{
border: 1px solid red;
margin: 0px;
}
</style>
</head>
<body>
<h4>My First Hello World in PHP</h4>
<?php
$dateFile = fopen("info.txt", "r");
while ($dateLine = fgets($dateFile, 4096))
{
$dateList[] = $dateLine;
}
echo "<ul>";
echo "<li><p>Sorting the dates using sort() function:</p><ol>";
sort($dateList);
foreach ($dateList as $date)
{
echo "<li>$date</li>";
}
echo "</ol></li>";
echo "<li><p>Sorting the dates using natsort() function:</p><ol>";
natsort($dateList);
foreach ($dateList as $date)
{
echo "<li>$date</li>";
}
echo "</ol></li>";
function opDateSort($a, $b)
{
if ($a == $b) return 0;
list($aMonth, $aDay, $aYear) = explode("-", $a);
list($bMonth, $bDay, $bYear) = explode("-", $b);
$aMonth = str_pad($aMonth, 2, "0", STR_PAD_LEFT);
$bMonth = str_pad($bMonth, 2, "0", STR_PAD_LEFT);
$aDay = str_pad($aDay, 2, "0", STR_PAD_LEFT);
$bDay = str_pad($bDay, 2, "0", STR_PAD_LEFT);
$aDate = $aYear.$aMonth.$aDay;
$bDate = $bYear.$bMonth.$bDay;
return $aDate>$bDate?1:-1;
}
echo "<li><p>Sorting the dates using usort() with user defined comparing function:</p><ol>";
usort($dateList, 'opDateSort');
foreach ($dateList as $date)
{
echo "<li>$date</li>";
}
echo "</ol></li>";
echo "</ul>";
?>
</body>
</html>其中info.txt的内容为
4-1-1969 10-25-1987 9-11-1982 6-18-1928 4-27-1927 6-12-1923 7-16-1922 7-23-1921
结果如图所示
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