陣列排序 - PHP程式筆記

preg_match()範例

	<?php
	//原始陣序
	$array = array(5,8,9,5,4,4,2,1,0,5,8,7,4,5,2,6,3,5,1,5);
	 
	//隨機排序
	shuffle($array);
	echo "隨機排列\n";
	print_r($array);
	 
	//小到大排序(根據值，會改變index)
	sort($array);
	echo "小到大排序(根據值，會改變index)\n";
	print_r($array);
	 
	//大到小排序(根據值，會改變index)
	rsort($array);
	echo "大到小排序(根據值，會改變index)\n";
	print_r($array);
	 
	//小到大排序(根據值，不改變index)
	asort($array);
	echo "小到大排序(根據值，不改變index)\n";
	print_r($array);
	 
	//大到小排序(根據值，不改變index)
	arsort($array);
	echo "大到小排序(根據值，不改變index)\n";
	print_r($array);
	 
	//小到大排序(根據key)
	ksort($array);
	echo "小到大排序(根據key)\n";
	print_r($array);
	 
	//大到小排序(根據key)
	krsort($array);
	echo "大到小排序(根據key)\n";
	print_r($array);
	?>

執行結果

	隨機排列
	Array
	(
		[0] => 2
		[1] => 5
		[2] => 7
		[3] => 5
		[4] => 3
		[5] => 1
		[6] => 4
		[7] => 9
		[8] => 5
		[9] => 4
		[10] => 5
		[11] => 6
		[12] => 5
		[13] => 5
		[14] => 8
		[15] => 8
		[16] => 4
		[17] => 1
		[18] => 2
		[19] => 0
	)
	小到大排序(根據值，會改變index)
	Array
	(
		[0] => 0
		[1] => 1
		[2] => 1
		[3] => 2
		[4] => 2
		[5] => 3
		[6] => 4
		[7] => 4
		[8] => 4
		[9] => 5
		[10] => 5
		[11] => 5
		[12] => 5
		[13] => 5
		[14] => 5
		[15] => 6
		[16] => 7
		[17] => 8
		[18] => 8
		[19] => 9
	)
	大到小排序(根據值，會改變index)
	Array
	(
		[0] => 9
		[1] => 8
		[2] => 8
		[3] => 7
		[4] => 6
		[5] => 5
		[6] => 5
		[7] => 5
		[8] => 5
		[9] => 5
		[10] => 5
		[11] => 4
		[12] => 4
		[13] => 4
		[14] => 3
		[15] => 2
		[16] => 2
		[17] => 1
		[18] => 1
		[19] => 0
	)
	小到大排序(根據值，不改變index)
	Array
	(
		[19] => 0
		[17] => 1
		[18] => 1
		[15] => 2
		[16] => 2
		[14] => 3
		[11] => 4
		[12] => 4
		[13] => 4
		[10] => 5
		[9] => 5
		[6] => 5
		[7] => 5
		[5] => 5
		[8] => 5
		[4] => 6
		[3] => 7
		[1] => 8
		[2] => 8
		[0] => 9
	)
	大到小排序(根據值，不改變index)
	Array
	(
		[0] => 9
		[2] => 8
		[1] => 8
		[3] => 7
		[4] => 6
		[6] => 5
		[7] => 5
		[8] => 5
		[9] => 5
		[5] => 5
		[10] => 5
		[12] => 4
		[13] => 4
		[11] => 4
		[14] => 3
		[16] => 2
		[15] => 2
		[17] => 1
		[18] => 1
		[19] => 0
	)
	小到大排序(根據key)
	Array
	(
		[0] => 9
		[1] => 8
		[2] => 8
		[3] => 7
		[4] => 6
		[5] => 5
		[6] => 5
		[7] => 5
		[8] => 5
		[9] => 5
		[10] => 5
		[11] => 4
		[12] => 4
		[13] => 4
		[14] => 3
		[15] => 2
		[16] => 2
		[17] => 1
		[18] => 1
		[19] => 0
	)
	大到小排序(根據key)
	Array
	(
		[19] => 0
		[18] => 1
		[17] => 1
		[16] => 2
		[15] => 2
		[14] => 3
		[13] => 4
		[12] => 4
		[11] => 4
		[10] => 5
		[9] => 5
		[8] => 5
		[7] => 5
		[6] => 5
		[5] => 5
		[4] => 6
		[3] => 7
		[2] => 8
		[1] => 8
		[0] => 9
	)