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20. array_push()/*Arry function*/

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PHP(2015-10)
============

Another common thing to do with arrays is sort them. Handily enough, PHP has a `<span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">sort</span>()` function for just such an occasion!

```
<pre style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(197, 200, 198); border-radius: 2px; padding: 7px 10px; font-size: 15px; line-height: 22px; background-color: rgb(35, 44, 49);">
```
<span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(181, 137, 0);"><span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">$array</span></span> = <span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(178, 148, 187);"><span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">array</span></span>(<span class="number" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(222, 147, 95);"><span class="number" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">5</span></span>, <span class="number" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(222, 147, 95);"><span class="number" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">3</span></span>, <span class="number" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(222, 147, 95);"><span class="number" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">7</span></span>, <span class="number" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(222, 147, 95);"><span class="number" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">1</span></span>);
sort(<span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(181, 137, 0);"><span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">$array</span></span>);
<span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(178, 148, 187);"><span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">print</span></span> join(<span class="string" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(181, 189, 104);"><span class="string" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">", "</span></span>, <span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(181, 137, 0);"><span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">$array</span></span>);
<span class="comment" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(150, 152, 150); font-style: italic;"><span class="comment" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">// prints "1, 3, 5, 7"</span></span>

```
```

PHP also has the opposite function:`rsort()`.

```
<pre style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(197, 200, 198); border-radius: 2px; padding: 7px 10px; font-size: 15px; line-height: 22px; background-color: rgb(35, 44, 49);">
```
<span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(181, 137, 0);"><span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">$array</span></span> = <span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(178, 148, 187);"><span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">array</span></span>(<span class="number" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(222, 147, 95);"><span class="number" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">5</span></span>, <span class="number" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(222, 147, 95);"><span class="number" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">3</span></span>, <span class="number" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(222, 147, 95);"><span class="number" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">7</span></span> ,<span class="number" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(222, 147, 95);"><span class="number" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">1</span></span>);
rsort(<span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(181, 137, 0);"><span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">$array</span></span>);
<span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(178, 148, 187);"><span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">print</span></span> join(<span class="string" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(181, 189, 104);"><span class="string" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">":"</span></span>, <span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(181, 137, 0);"><span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">$array</span></span>);
<span class="comment" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(150, 152, 150); font-style: italic;"><span class="comment" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">// prints "7:5:3:1"</span></span>

```
```

Lastly, we use `<span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">join</span>(glue, array)` so we can easily print out the representations of our sorted arrays in this exercise.

For this exercise, we'll use a comma (`,`) as the glue.

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