php 归拢两个有序数组
php 合并两个有序数组
对于两个有序数组,每个数组都是循环一次,即可有序的排列到新的数组里面;
采取主意递增,比较,然后按顺序插入,php代码:
<?php $arr1 = array(1,2,3,4,5,6,7,8);//示例数据 $arr2 = array(3,4,5,7,9,10); echo '<pre class="brush:php;toolbar:false">'; print_r(mergeOrderly($arr1,$arr2));//示例 function mergeOrderly($arr1,$arr2){ if(!count($arr1)){//判断参数是否有意义 return false; }elseif(!count($arr2)){ return false; }else {//进行合并 $arr = array();//定义最终数组容器 $arr2Num = count($arr2);//统计数组长度 $arr1Num = count($arr1); $i1 = 0;//数组1 的循环标记 $i2 = 0;//数组2 的循环标记 while($i1 $arr2[$i2]){//需要比较数组1和数组2,小的放入目标数组,并且标记+1 $arr[] = $arr2[$i2]; $i2++; }else{ $arr[] = $arr1[$i1]; $i1++; } }elseif($i1 = $arr2Num){//数组2 已经到达末尾,而数组1还为到达,情况二 $arr[] = $arr1[$i1];//直接把数组1的内容插入到目标数组中 $i1++; }elseif($i2 = $arr1Num){//数组1已经到达末尾,而数组2还未到达,情况三 $arr[] = $arr2[$i2];//直接把数组2的内容插入到目标数组中 $i2++; } } return $arr; } } ?>

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