php 收集api方法

1.PHP array_diff() 函数
实例
比较两个数组的键值，并返回差集：

<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("e"=>"red","f"=>"green","g"=>"blue");
 
$result=array_diff($a1,$a2);
print_r($result); //Array ( [d] => yellow )
?>

2.array_intersect() 函数
实例
比较两个数组的键值，并返回交集：

<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("e"=>"red","f"=>"green","g"=>"blue");

$result=array_intersect($a1,$a2);
print_r($result);//Array ( [a] => red [b] => green [c] => blue )
?>