1取出两数组的交集 然后用交集与a数组进行差集比较,如果a完全属于b则结果为空 ~~~ $b=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow"); $a=array("a"=>"red","b"=>"green","c"=>"blue"); var_dump($b); var_dump($a); echo "交集数组："; $intersect=array_intersect_assoc($b,$a); var_dump($intersect);//array("a"=>"red","b"=>"green","c"=>"blue") echo "差集数组："; $diff=array_diff_assoc($intersect,$a); var_dump($diff);//[] 这个差集数组的个数就是不相同的个数 if($diff==[]){ echo '$a完全属于$b'; }else{ echo '$a不完全属于$b'; } ~~~