PHP智能自然排序natsort()函数

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<?php
	
	/*
	 * natsort:自然排序，根据字母与数字的组合方式进行排序比较
	 * sort()函数中 file14 < file2，因为第4位前者1小于后者2
	 * natcasesort():忽略大小写
	 */
	$array = array("file.txt", "File1.txt", "file14.txt", "file13.txt", "file2.txt");
	
	print_r($array);
	echo "<br/>";
	natsort($array);
	print_r($array);
	echo "<br/>";
	natcasesort($array);
	print_r($array);
	echo "<br/>";

输出结果：
Array ( [0] => file.txt [1] => File1.txt [2] => file14.txt [3] => file13.txt [4] => file2.txt )
Array ( [1] => File1.txt [0] => file.txt [4] => file2.txt [3] => file13.txt [2] => file14.txt )
Array ( [0] => file.txt [1] => File1.txt [4] => file2.txt [3] => file13.txt [2] => file14.txt )
Array ( [0] => file.txt [1] => File1.txt [4] => file2.txt [3] => file13.txt [2] => file14.txt )