随着PHP的快速发展，用它的人越来越多，在PHP数组学习摘录部分了解到最基本的PHP数组的建立和数组元素的显示。需要深入学习下PHP数组的相关操作。首先接触的就是PHP数组排序、降序的排序问题。
快速创建数组的函数range()
<ol class="dp-xml"> <li class="alt"><span><span>比如range()函数可以快速创建从1到9的数字数组： </span></span></li> <li class=""> <span></span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span> </span> </li> <li class="alt"> <span>$</span><span class="attribute"><font color="#ff0000">numbers</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">range</font></span><span>(1,9); </span> </li> <li class=""><span>echo $numbers[1]; </span></li> <li class="alt"> <span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span> </li> </ol>
当然，使用range(9,1)则创建了9到1的数字数组。同时，range()还可以创建从a到z 的字符数组：
<ol class="dp-xml"> <li class="alt"><span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span> </span></span></li> <li class=""> <span>$</span><span class="attribute"><font color="#ff0000">numbers</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">range</font></span><span>(a,z); </span> </li> <li class="alt"><span>foreach ($numbers as $mychrs) </span></li> <li class=""><span>echo $mychrs." "; </span></li> <li class="alt"> <span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span> </li> </ol>
<ol class="dp-xml">
<li class="alt"><span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span> </span></span></li>
<li class="">
<span>$</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 $mychrs." "; </span></li>
<li class="alt">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span>
</li>
</ol>升序排序后的数组元素显示为 birth name nation sex，当然，sort()函数是区分字母大小写的（字母从大到小的顺序是：A…Z…a…z）
Sort()函数还具有第二参数，用来说明PHP数组排序升序的规则是用来比较数字还是字符串的。比如：
<ol class="dp-xml">
<li class="alt"><span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span> </span></span></li>
<li class="">
<span>echo "---按数字升序排序---</span><strong><font color="#006699"><span class="tag"><span class="tag-name">br</span></span></font></strong><span> </span><span class="tag"><strong><font color="#006699">/></font></strong></span><span>"; </span>
</li>
<li class="alt">
<span>$</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 $mychrs." "; </span></li>
<li class="alt">
<span>echo "</span><strong><font color="#006699"><span class="tag"><span class="tag-name">br</span></span></font></strong><span> </span><span class="tag"><strong><font color="#006699">/></font></strong></span><span>---按字符升序排序---</span><strong><font color="#006699"><span class="tag"><span class="tag-name">br</span></span></font></strong><span> </span><span class="tag"><strong><font color="#006699">/></font></strong></span><span>"; </span>
</li>
<li class="">
<span>$</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="alt"><span>sort($num3,SORT_STRING); </span></li>
<li class=""><span>foreach ($num3 as $mychrs) </span></li>
<li class="alt"><span>echo $mychrs." "; </span></li>
<li class="">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span>
</li>
</ol>SORT_NUMERIC和SORT_STRING用来声明按数字或字符的升序排列。如果按照数字升序排列是：3，26；但如果按照字符升序排列则是：26，3了。PHP中除了升序函数以外，还有降序或称反向排列的函数，就是rsort()函数，比如：$num1=range(1,9);rsort($num1);这里其实就相当于range(9,1)。
