我们在学习一般数组中的各元素均以字符或数字表现的，所以可对数组元素进行升序排列，该功能函数为sort()。比如：
<ol class="dp-xml">
<li class="alt"><span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span> </span></span></li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">people</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">array</font></span><span>('name','sex','nation','birth'); </span>
</li>
<li class="alt"><span>foreach ($people as $mychrs) </span></li>
<li class=""><span> echo $mychrs." "; </span></li>
<li class="alt"><span>sort($people); </span></li>
<li class="">
<span>echo "</span><strong><font color="#006699"><span class="tag"><span class="tag-name">br</span></span></font></strong><span> </span><span class="tag"><strong><font color="#006699">/></font></strong></span><span>---排序后---</span><strong><font color="#006699"><span class="tag"><span class="tag-name">br</span></span></font></strong><span> </span><span class="tag"><strong><font color="#006699">/></font></strong></span><span>"; </span>
</li>
<li class="alt"><span>foreach ($people as $mychrs) </span></li>
<li class=""><span> echo $mychrs." "; </span></li>
<li class="alt">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span>
</li>
</ol>升序排序后的数组元素显示为 birth name nation sex，当然，PHP函数sort()是区分字母大小写的（字母从大到小的顺序是：A…Z…a…z）
Sort()函数还具有第二参数，用来说明升序的规则是用来比较数字还是字符串的。比如：
<ol class="dp-xml">
<li class="alt"><span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span> </span></span></li>
<li class="">
<span>echo "---按数字升序排序---</span><strong><font color="#006699"><span class="tag"><span class="tag-name">br</span></span></font></strong><span> </span><span class="tag"><strong><font color="#006699">/></font></strong></span><span>"; </span>
</li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">num2</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">array</font></span><span>('26','3',); </span>
</li>
<li class=""><span>sort($num2,SORT_NUMERIC); </span></li>
<li class="alt"><span>foreach ($num2 as $mychrs) </span></li>
<li class=""><span>echo $mychrs." "; </span></li>
<li class="alt"><span> </span></li>
<li class="">
<span>echo "</span><strong><font color="#006699"><span class="tag"><span class="tag-name">br</span></span></font></strong><span> </span><span class="tag"><strong><font color="#006699">/></font></strong></span><span>---按字符升序排序---</span><strong><font color="#006699"><span class="tag"><span class="tag-name">br</span></span></font></strong><span> </span><span class="tag"><strong><font color="#006699">/></font></strong></span><span>"; </span>
</li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">num3</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">array</font></span><span>('26','3'); </span>
</li>
<li class=""><span>sort($num3,SORT_STRING); </span></li>
<li class="alt"><span>foreach ($num3 as $mychrs) </span></li>
<li class=""><span> echo $mychrs." "; </span></li>
<li class="alt">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span>
</li>
</ol>
SORT_NUMERIC和SORT_STRING用来声明按数字或字符的升序排列。如果按照数字升序排列是：3，26；但如果按照字符升序排列则是：26，3了。
PHP中除了升序函数以外，还有降序或称反向排列的函数，就是PHP函数sort()，比如：
<ol class="dp-xml"> <li class="alt"><span><span>$</span><span class="attribute"><font color="#ff0000">num1</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">range</font></span><span>(1,9); </span></span></li> <li class=""><span>rsort($num1); //这里其实就相当于range(9,1) </span></li> </ol>
