本文实例讲述了PHP实现合并两个有序数组的方法。分享给大家供大家参考,具体如下:
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$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 , $arr2 )); |
运行结果:
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Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 3 [4] => 4 [5] => 4 [6] => 5 [7] => 5 [8] => 6 [9] => 7 [10] => 7 [11] => 8 [12] => 9 [13] => 10 ) Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 3 [4] => 4 [5] => 4 [6] => 5 [7] => 5 [8] => 6 [9] => 7 [10] => 7 [11] => 8 [12] => 9 [13] => 10 ) |
细心的读者应该发现了,合并后的数组并没有去重复。下面介绍一下数组合并后去重复的方法:
1. 单数组去重复
array_unique($arrTest)
2. 多数组去重复
array_keys(array_flip($arr1)+array_flip($arr2))
测试示例:
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$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 ); |
运行结果:
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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) } |
希望本文所述对大家PHP程序设计有所帮助。
原文链接:http://blog.csdn.net/u013474436/article/details/62224353