求取关联数组的差集

交并差示例图

array_diff 函数官网文档截图:https://www.php.net/manual/zh...

有时在业务逻辑当中咱们要获取两个数组的差集,本意是想获取差集,即图中 A-B=a+b 局部,不蕴含 c 局部.PHP 内置函数中首先想到的是 array_diff() 函数,但 array_diff() 函数传参中第一个 array1 是比照的参照数据,返回的数据是在 array1 中不在其余 array 中的值,显然这并不合乎咱们的预期.咱们能够依据文档测试下 array_diff() 函数返回差集.
示例代码
<?php    //关联数组实例    $array1 = ["a" => "green", "b" => "red", "c" => "blue", "d" => "pink"];    $array2 = ["a" => "green", "b" => "white", "e" => "yellow", "f" => "pink"];    $result = array_diff($array1, $array2);    print_r($result);    /*    输入内容    Array    (         [b] => red          [c] => blue    )    */    //索引数组实例    $array1 = ["green", "red", "blue", "pink"];    $array2 = ["green", "white", "yellow", "pink", "black"];    $result = array_diff($array1, $array2);    print_r($result);    /*    输入内容    Array (         [1] => red         [2] => blue    )    */    //文档曾经说函数的返回内容,然而能够屡次应用 array_diff() 函数比照两个数组来实现咱们的目标    //关联数组    $array1 = ["a" => "green", "b" => "red", "c" => "blue", "d" => "pink"];    $array2 = ["a" => "green", "b" => "white", "e" => "yellow", "f" => "pink"];    $result1 = array_diff($array1, $array2);    $result2 = array_diff($array2, $array1);    $result3 = array_merge($result1,$result2);    print_r($result3);    /*    输入内容    Array (        [b] => white         [c] => blue         [e] => yellow    )    */    //索引数组    $array1 = ["green", "red", "blue", "pink"];    $array2 = ["green", "white", "yellow", "pink", "black"];    $result1 = array_diff($array1, $array2);    $result2 = array_diff($array2, $array1);    $result3 = array_merge($result1,$result2);    print_r($result3);    /*    输入内容    Array (        [0] => red         [1] => blue         [2] => white         [3] => yellow        [4] => black    )    */
其余形式
从 PHP 官网文档中咱们发现有一个 DS 扩大类,地位:"PHP 手册->函数参考->其它根本扩大->Data Structures",从下图中能够看到简介"PHP7高效的数据结构，能够作为 array 的代替",这是 PHP7 中对 array 的一个替代品,通过仔细阅读可知 DS 蕴含的数据结构可能很好的代替 array 数据结构,提供了更多的数据结构抉择.
Data Structures :https://www.php.net/manual/zh...

\Ds\Set 和 \Ds\Map 扩大应用实例
<?php    //应用 DS 扩大须要手动装置,能够应用 phpize(https://pecl.php.net/package/ds)形式也能够pecl install ds 形式       //关联数组    //Ds\Set()    $array1 = ["a" => "green", "b" => "red", "c" => "blue", "d" => "pink"];    $array2 = ["a" => "green", "b" => "white", "e" => "yellow", "f" => "pink"];    $tpm_1 = new \Ds\Set($array1);    $tpm_2 = new \Ds\Set($array2);    print_r($tpm_1->xor($tpm_2)->toArray());    /*    输入内容    Array (        [0] => red         [1] => blue         [2] => white         [3] => yellow    )    */    //Ds\Map()    $array1 = ["a" => "green", "b" => "red", "c" => "blue", "d" => "pink"];    $array2 = ["a" => "green", "b" => "white", "e" => "yellow", "f" => "pink"];    $tpm_1 = new \Ds\Map($array1);    $tpm_2 = new \Ds\Map($array2);    print_r($tpm_1->xor($tpm_2)->toArray());    /*    输入内容    Array (        [c] => blue         [d] => pink         [e] => yellow         [f] => pink    )    */    //索引数组    //Ds\Set()    $array1 = ["green", "red", "blue", "pink"];    $array2 = ["green", "white", "yellow", "pink", "black"];    $tpm_1 = new \Ds\Set($array1);    $tpm_2 = new \Ds\Set($array2);    print_r($tpm_1->xor($tpm_2)->toArray());    /*    输入内容    Array (        [0] => red         [1] => blue         [2] => white         [3] => yellow         [4] => black    )    */    //Ds\Map()    $array1 = ["green", "red", "blue", "pink"];    $array2 = ["green", "white", "yellow", "pink", "black"];    $tpm_1 = new \Ds\Map($array1);    $tpm_2 = new \Ds\Map($array2);    print_r($tpm_1->xor($tpm_2)->toArray());    /*    输入内容    Array (        [4] => black    )    */