PHP merge two ordered array cases
This article mainly introduces how to merge two ordered arrays in PHP. Interested friends can refer to it. I hope it will be helpful to everyone.
The case is as follows:
$arr1 = array(1,2,3,4,5,6,7,8);
$arr2 = array(3,4,5,7,9,10);
//方法1
function mergeOrderly1($arr1,$arr2){
$i=0;$j=0;
$int = array();
while($i<count($arr1) && $j<count($arr2)){
$int[] = $arr1[$i]<$arr2[$j]?$arr1[$i++]:$arr2[$j++];
}
while($i<count($arr1)){
$int[] = $arr1[$i++];
}
while($j<count($arr2)){
$int[] = $arr2[$j++];
}
//$int = array_merge($int,array_slice($arr1,$i));
//$int = array_merge($int,array_slice($arr2,$j));
return $int;
}
//方法2
function mergeOrderly2($arr1,$arr2){
$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 < $arr1Num || $i2 < $arr2Num){//是否还需要合并
if($i1 < $arr1Num && $i2 < $arr2Num){//当两个数组都没有到达末尾，情况一
if($arr1[$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 < $arr1Num && $i2 >= $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 < $arr2Num && $i1 >= $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 $arr;
}
print_r(mergeOrderly1($arr1,$arr2));
print_r(mergeOrderly2($arr1,$arr2));Running results:
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 3 [4] => 4 [5] => 4 [6] => 5 [7] => 5 [8] => 6 [9] => 7 [10] => 7 [11] => 8 [12] => 9 [13] => 10 ) Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 3 [4] => 4 [5] => 4 [6] => 5 [7] => 5 [8] => 6 [9] => 7 [10] => 7 [11] => 8 [12] => 9 [13] => 10 )
Careful readers should have discovered that the merged arrays are not duplicated. The following introduces the method of deduplication after merging arrays:
1. Deduplication of single arrays
array_unique($arrTest)
2. Deduplication of multiple arrays
array_keys(array_flip($arr1)+array_flip($arr2))
Test example:
$arr1 = array(1,2,3,4,5); $arr2 = array(1,2,3,6,7); $arr3 = array('0'=>1,'1'=>2,'2'=>3,'3'=>4,'4'=>5); $arr4 = array('0'=>1,'1'=>2,'2'=>3,'3'=>6,'4'=>7); $arr5 = array('0'=>1,'a'=>2,'b'=>3,'c'=>4,'4'=>5); $arr6 = array('0'=>1,'a'=>2,'c'=>3,'d'=>6,'4'=>7); var_dump(array_merge($arr1, $arr2)); var_dump($arr1+$arr2); var_dump(array_keys(array_flip($arr1)+array_flip($arr2))); echo '<br>'; var_dump(array_merge($arr3, $arr4)); var_dump($arr3+$arr4); var_dump(array_keys(array_flip($arr3)+array_flip($arr4))); echo '<br>'; var_dump(array_merge($arr5, $arr6)); var_dump($arr5+$arr6);
Test results:
array(10) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(1) [6]=> int(2) [7]=> int(3) [8]=> int(6) [9]=> int(7) }
array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) }
array(7) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(6) [6]=> int(7) }
array(10) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(1) [6]=> int(2) [7]=> int(3) [8]=> int(6) [9]=> int(7) }
array(5) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) }
array(7) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(6) [6]=> int(7) }
array(8) { [0]=> int(1) ["a"]=> int(2) ["b"]=> int(3) ["c"]=> int(3) [1]=> int(5) [2]=> int(1) ["d"]=> int(6) [3]=> int(7) }
array(6) { [0]=> int(1) ["a"]=> int(2) ["b"]=> int(3) ["c"]=> int(4) [4]=> int(5) ["d"]=> int(6) }Related recommendations:
Analysis of the method of merging two ordered arrays in PHP
Java has Analysis of ordinal array data structure and binary search algorithm
Introduction to the method of finding the minimum absolute value in an ordered array using PHP
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