sort(): 将一个数组元素从低到高进行简单排序，这个函数既可以按数字大小排列也可以按字母顺序排列。
<code>Listing A<span><?php</span><span>$data</span> = <span>array</span>(<span>5</span>,<span>8</span>,<span>1</span>,<span>7</span>,<span>2</span>); sort(<span>$data</span>); print_r(<span>$data</span>);<span>?></span>输出结果如下所示：<span>Array</span> ([<span>0</span>] => <span>1</span>[<span>1</span>] => <span>2</span>[<span>2</span>] => <span>5</span>[<span>3</span>] => <span>7</span>[<span>4</span>] => <span>8</span>)</code>
rsort(): 对数组元素进行从高到低的倒排，同样可以按数字大小排列也可以按字母顺序排列。
<code><span><?php</span><span>$data</span> = <span>array</span>(<span>5</span>,<span>8</span>,<span>1</span>,<span>7</span>,<span>2</span>);rsort(<span>$data</span>); print_r(<span>$data</span>);<span>?></span>它的输出结果如下：<span>Array</span> ([<span>0</span>] => <span>8</span>[<span>1</span>] => <span>7</span>[<span>2</span>] => <span>5</span>[<span>3</span>] => <span>2</span>[<span>4</span>] => <span>1</span>)</code>
ksort(): 根据关键字进行排序的函数，同时，它在排序的过程中会保持关键字的相关性。
<code><span><?php</span><span>$data</span> = <span>array</span>(<span>"US"</span> => <span>"United States"</span>, <span>"IN"</span> => <span>"India"</span>, <span>"DE"</span> => <span>"Germany"</span>, <span>"ES"</span> => <span>"Spain"</span>); ksort(<span>$data</span>); print_r(<span>$data</span>);<span>?></span>它的输出结果如下：<span>Array</span> ([DE] => Germany[ES] => Spain[IN] => India[US] => United States)</code>
krsort(): 根据关键字对数组进行倒排。
<code><span><?php</span><span>$data</span> = <span>array</span>(<span>"US"</span> => <span>"United States"</span>, <span>"IN"</span> => <span>"India"</span>, <span>"DE"</span> => <span>"Germany"</span>, <span>"ES"</span> => <span>"Spain"</span>); krsort(<span>$data</span>); print_r(<span>$data</span>);<span>?></span>它的输出结果如下：<span>Array</span> ([US] => United States[IN] => India[ES] => Spain[DE] => Germany)</code>
asort(): 使用值排序来取代关键字排序，请注意关键字-值之间的联系会始终保持。
<code><span><?php</span><span>$data</span> = <span>array</span>(<span>"US"</span> => <span>"United States"</span>, <span>"IN"</span> => <span>"India"</span>, <span>"DE"</span> => <span>"Germany"</span>, <span>"ES"</span> => <span>"Spain"</span>); asort(<span>$data</span>); print_r(<span>$data</span>);<span>?></span>它的输出结果如下：<span>Array</span> ([DE] => Germany[IN] => India[ES] => Spain[US] => United States)</code>
arsort(): 根据值按字母表顺序进行倒排。
<code><span><?php</span><span>$data</span> = <span>array</span>(<span>"US"</span> => <span>"United States"</span>, <span>"IN"</span> => <span>"India"</span>, <span>"DE"</span> => <span>"Germany"</span>, <span>"ES"</span> => <span>"Spain"</span>); arsort(<span>$data</span>); print_r(<span>$data</span>);<span>?></span><span>Array</span> ([US] => United States[ES] => Spain[IN] => India[DE] => Germany)</code>
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