Implementation examples of simple intersection, difference and union functions of PHP arrays

 'zero', '1' => 'one', '2' => 'two', '3' => 'three' ); $arr2 = array( '2' => 'two', 'three' => 'three', '4' => 'four', '5' => 'five' ); //差集【对比返回在 arr1 中但是不在 arr2 及任何其它参数数组中的值。】 $array_diff = array_diff($arr1,$arr2); echo "
"; print_r($array_diff); /* 输出结果 *Array *( * [0] => zero * [1] => one *) */ //交集【对比返回既在 arr1 中也在 arr2 数组中的值。】 # 注意事项: 键值保留arr1数组中的键值不变 $array_intersect = array_intersect($arr1,$arr2); echo "
"; print_r($array_intersect); /* 输出结果 *Array *( * [2] => two * [3] => three *) */ //并集【将arr1数组中的值附加在arr2数组的后面。返回作为结果的数组。 】 #注意事项：【如果输入的数组中有相同的字符串键名，则该键名后面的值将覆盖前一个值。 #然而，如果数组包含数字键名，后面的值将不会覆盖原来的值，而是附加到后面。】 $array_merge = array_merge($arr1,$arr2); echo "
"; print_r($array_merge); /* 输出结果 * Array * ( * [0] => zero * [1] => one * [2] => two * [3] => three * [4] => two * [three] => three * [5] => four * [6] => five * ) */ ?>
        

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