Maison >développement back-end >tutoriel php >深入理解PHP多维数组排序原理_PHP教程
随着时代的发展,喜欢用PHP语言的人越来越多,我们这里就回顾一下PHP多维数组排序的功能,希望大家能得到收获。如果成功则返回 TRUE,失败则返回 FALSE。array_multisort() 可以用来一次对多个数组进行排序,或者根据某一维或多维对PHP多维数组排序。
排序顺序标志:
◆SORT_ASC - 按照上升顺序排序
◆SORT_DESC - 按照下降顺序排序
排序类型标志:
◆SORT_REGULAR - 将项目按照通常方法比较
◆SORT_NUMERIC - 将项目按照数值比较
◆SORT_STRING - 将项目按照字符串比较
每个数组之后不能指定两个同类的排序标志。每个数组后指定的排序标志仅对该数组有效 - 在此之前为默认值 SORT_ASC 和 SORT_REGULAR。
例子 1. 对PHP多维数组排序
<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>$</span><span class="attribute"><font color="#ff0000">ar1</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">array</font></span><span>("10", 100, 100, "a"); </span> </li> <li class="alt"> <span>$</span><span class="attribute"><font color="#ff0000">ar2</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">array</font></span><span>(1, 3, "2", 1); </span> </li> <li class=""><span>array_multisort($ar1, $ar2); </span></li> <li class="alt"><span> </span></li> <li class=""><span>var_dump($ar1); </span></li> <li class="alt"><span>var_dump($ar2); </span></li> <li class=""> <span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span> </li> </ol>
本例中经过排序后,第一个数组将包含 "10","a",100,100。第二个数组将包含 1,1,"2",3。第二个数组中的项目顺序完全和第一个数组中相应的项目(100 和 100)顺序一致。
<ol class="dp-xml"> <li class="alt"><span><span>array(4) { </span></span></li> <li class=""> <span>[0]=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> string(2) "10" </span> </li> <li class="alt"> <span>[1]=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> string(1) "a" </span> </li> <li class=""> <span>[2]=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> int(100) </span> </li> <li class="alt"> <span>[3]=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> int(100) </span> </li> <li class=""><span>} </span></li> <li class="alt"><span>array(4) { </span></li> <li class=""> <span>[0]=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> int(1) </span> </li> <li class="alt"> <span>[1]=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> int(1) </span> </li> <li class=""> <span>[2]=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> string(1) "2" </span> </li> <li class="alt"> <span>[3]=</span><span class="tag"><strong><font color="#006699">></font></strong></span><span> int(3) </span> </li> <li class=""><span>} </span></li> </ol>