sort()&rsort()&ksort()&asort()&arsort()&krsort()

升序：从低到高

降序：从高到低

sort()

对数组按照值进行升序排序，将会删除原有的键名，并重新赋予新的建名

rsort()

对数组按照值进行降序排序，将会删除原有的键名，并重新赋予新的建名

ksort()

对数组按照键名进行升序排序，保留原有的建名跟值的对应关系

krsort()

对数组按照键名进行降序排序，保留原有的建名跟值的对应关系

asort()

对数组按照值进行升序排序,保留原有的建名跟值的对应关系

arsort()

对数组按照值进行降序排序，保留原有的建名跟值的对应关系

示例：

<?php
	//create the movies 
	$movies=array(
				‘gangtiexia‘ =>10,
				‘jianbingxia‘=>10,
				‘zhuzhuxia‘=>6,
				‘doupo‘=>9,
				‘dota‘=>7
				 );

	//初始数组
	echo ‘<tr><td><b>original order</b></td></tr><br>‘;
	foreach ($movies as $title => $grade) {
		# code...
		echo "<tr><td>$grade</td>
		<td>$title</td></tr><br>";
	}
	echo "<hr>";
	
	//ksort()排序
	echo ‘<tr><td ><b>ksort by title</b></td></tr><br>‘;
	ksort($movies);
	foreach ($movies as $title => $grade) {
		# code...
		echo "<tr><td>$grade</td>
			<td>$title</td></tr><br>";
	}

	//krsort()排序
	echo ‘<tr><td ><b>krsort by title</b></td></tr><br>‘;
	krsort($movies);
	foreach ($movies as $title => $grade) {
		# code...
		echo "<tr><td>$grade</td>
			<td>$title</td></tr><br>";
	}
	echo "<hr>";
	
	//asort()排序
	echo ‘<tr><td><b>asort by grade</b></td></tr><br>‘;
	asort($movies);
	foreach ($movies as $title => $grade) {
		# code...
		echo "<tr><td>$grade</td>
			<td>$title</td></tr><br>";	
	}
	//arsort()排序
	echo ‘<tr><td><b>arsort by grade</b></td></tr><br>‘;
	arsort($movies);
	foreach ($movies as $title => $grade) {
		# code...
		echo "<tr><td>$grade</td>
			<td>$title</td></tr><br>";	
	}
 	echo "<hr>";
	
	//sort()排序
	echo ‘<tr><td><b>sort by </b></td></tr><br>‘;
	sort($movies);
	foreach ($movies as $title => $grade) {
		# code...
		echo "<tr><td>$grade</td>
		<td>$title</td></tr><br>";
	}
	//rsort()排序
	echo ‘<tr><td><b>rsort by </b></td></tr><br>‘;
	rsort($movies);
	foreach ($movies as $title => $grade) {
		# code...
		echo "<tr><td>$grade</td>
		<td>$title</td></tr><br>";
	}
?>

结果：

来自为知笔记(Wiz)

sort()&rsort()&ksort()&asort()&arsort()&krsort()