php sorting function

sort(): Simply sort the elements of an array from low to high. This function can be arranged either numerically or alphabetically.

<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(): Sort the array elements from high to low, either numerically or alphabetically.

<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(): A function that sorts according to keywords. At the same time, it maintains the relevance of keywords during the sorting process.

<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

)</span></code>

krsort(): Reverse the array according to keywords.

<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

)</span></code>

asort(): Use value sorting instead of keyword sorting. Please note that the relationship between keywords and values ​​will always be maintained.

<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

)</span></code>

arsort(): Sort in alphabetical order by value.

<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

)</span></code>

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The above introduces the sorting function of PHP, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.