array-intersect | 易学教程

php array_intersect making issues and i'm not able to check the empty array

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问题 I have five arrays and a search for which user can do search randomly. So for among those five sometimes there may be value for two arrays, three arrays or five arrays and whatever. So When I intersect I am not be able to check which are empty so that it always returns an empty array. $full_ids = array_intersect($g_arr, $c_arr, $k_arr, $m_arr, $p_arr); Actually I need to check and make this dynamic like if there are values for $g_arr, $c_arr then the above operation will be applied with these

PHP : Obtain common values in 2 huge arrays [closed]

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问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 6 years ago . I have 2 arrays, Array A and B respectively . Array A contains ~300,000 string records, e.g. [0] => 'apple', [1] => 'pineapple', [2] => 'orange', ...

Checking if an array contains all elements of another array

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问题 I'm designing an electrical engineering application. However, i'm stuck on this: I have the following array <?php // Static Array $GroupOfEight = array ( array(0,1,3,2,4,5,7,6), array(4,5,6,7,16,12,13,14), array(12,13,15,14,8,9,11,10), array(2,6,14,10,3,7,15,11), array(1,3,5,7,13,15,9,11), array(0,4,12,8,1,5,13,9), array(0,1,3,2,8,9,11,10) ); ?> And I have another array, but this one is one dimensional. <?php $myStack = array(0,1,3,2,4,5,7,6); //Dynamic, gets value by POST method. ?> What I

Python intersection of two lists keeping duplicates

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问题 I have two flat lists where one of them contains duplicate values. For example, array1 = [1,4,4,7,10,10,10,15,16,17,18,20] array2 = [4,6,7,8,9,10] I need to find values in array1 that are also in array2, KEEPING THE DUPLICATES in array1. Desired outcome will be result = [4,4,7,10,10,10] I want to avoid loops as actual arrays will contain over millions of values. I have tried various set and intersect combinations, but just couldn't keep the duplicates.. Any help will be greatly appreciated!

How can I get the duplicate multidimensional array in php

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问题 I have an multidimensional array: Array ( [0] => Array ( [a] => 1 [b] => 2 [c] => 3 [d] => 4 ) [1] => Array ( [a] => 1 [b] => 5 [c] => 3 [d] => 4 ) [2] => Array ( [a] => 1 [b] => 2 [c] => 3 [d] => 4 ) ) Look at the first index (or zero) and third index (number two index), the values in a,b,c,d is equal 1,2,3,4. Assuming that the array is equal, or no different of them; my question is, how can I catch the array which equal, my purpose to show users about the value input duplicate, I have

PHP array_intersect() - how does it handle different types?

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问题 If I've got an array of values that are basically zerofilled string representations of various numbers and another array of integers, will array_intersect() still match elements of different types? For example, would this work: $arrayOne = array('0003', '0004', '0005'); $arrayTwo = array(4, 5, 6); $intersect = array_intersect($arrayOne, $arrayTwo); // $intersect would then be = "array(4, 5)" And if not, what would be the most efficient way to accomplish this? Just loop through and compare, or

PHP: array_uintersect() unexpected behaviour

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问题 Test script $i = 0; array_uintersect(['foo', 'bar'], ['baz', 'qux'], function($a, $b) use (&$i) { print_r([$a, $b, $i++]); }); Actual Result Array ( [0] => bar [1] => foo [2] => 0 ) Array ( [0] => qux [1] => baz [2] => 1 ) Array ( [0] => bar [1] => qux [2] => 2 ) Array ( [0] => bar [1] => foo [2] => 3 ) Expected Result Array ( [0] => foo [1] => baz [2] => 0 ) Array ( [0] => bar [1] => qux [2] => 1 ) In other words, what I am expecting to be passed to the callback is the current element of the

Intersect unknown number of arrays in PHP

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问题 I'm trying to intersect an arbitrary number of PHP arrays, the count of which depends on a user provided parameter, each of which can have any number of elements. For example: array1(1, 2, 3, 4, 5) array2(2, 4, 6, 8, 9, 23) array3(a, b, 3, c, f) ... arrayN(x1, x2, x3, x4, x5 ... xn) Since array_intersect takes a list of params, I can't build one array of arrays to intersect and have to work my way around this. I tried this solution: http://bytes.com/topic/php/answers/13004-array_intersect

compare two arrays of numbers and remove duplicates in php

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问题 OK i have two groups of mobile numbers (from mysql) which i need to process, the problem is i need to remove duplicate numbers from the results. Someone told me about "array_intersect" but I am not very good at these things and I don't see any good examples on the PHP website. Any help or suggestions is appreciated thanks :) 回答1: array_intersect isn't quite right — that finds numbers that are in both arrays $uniques = array_unique(array_merge($array1, $array2)); This merges the two arrays

Fast count() intersection of two string arrays

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I need to count the number of elements corresponding to the intersection of two big arrays of strings and do it very fast. I am using the following code: arr1[i].Intersect(arr2[j]).Count() For CPU Time, VS Profiler indicates 85.1% in System.Linq.Enumerable.Count() 0.3% in System.Linq.Enumerable.Intersect() Unfortunately it might to take hours to do all work. How to do it faster? You can use HashSet with arr2 HashSet<string> arr2Set = new HashSet<string>(arr2); arr1.Where(x=>arr2Set.Contains(x)).Count(); ------------------ | |->HashSet's contains method executes quickly using hash-based lookup.