【PHP中的去重方法详解和文件下载】教程文章相关的互联网学习教程文章

php数组存在重复的相反元素,去重复【代码】

$arr1=array('a_b','c_d','b_a','d_c'); $arr2=array('a_b','c_d','b_a','d_c'); 条件: a_b==b_a;c_d==d_c; 需求:想得到无重复的数组: $newArr=array('a_b','a_c'); 解法: $newArr=array(); foreach($arr2 as $key=>$value){$ceilArr=explode("_",$value);$str=$ceilArr[1].'_'.$ceilArr[0];if( in_array("$value",$arr1) && in_array("$str",$arr1) ){//echo array_search("$str",$arr1);echo '<br />';$newArr[]=$value;un...

php 排好序的数组去重 array_unique

* shrink.php<?php /*** $a = [1, 2, 3, 4, 5, 5, 5]* arrayshrink($a, 4, 7); // $a = [1,2,3,4,5]* remove elements from $start+1 to $end-1*/ function arrayshrink(array& $arr, int $start, int $end) {$n = count($arr);if ($start < 0 || $start >= $n) {throw new Exception("Illegal start");}if ($end <= $start || $end > $n) {throw new Exception("Illegal end");}$delta = $end - $start - 1;$last = $n - $delta;...