What is the array intersection function in php that only compares values?

The array intersection function in PHP that only compares values ​​is "array_intersect()"; this function is used to compare the key values ​​of two (or more) arrays, the syntax is "array_intersect(array1, array2. ..)" will return an intersection array containing values ​​taken from the compared array (array 1).

The operating environment of this tutorial: Windows 7 system, PHP version 7.1, DELL G3 computer

The array intersection function in php that only compares values ​​is array_intersect().

array_intersect() function is used to compare two (or more) arrays. When comparing, only the key values ​​of the arrays are compared and the intersection of the arrays is returned.

array_intersect(array1,array2,array3...);

array1,array2,array3... is the array list that needs to be compared

##ParametersDescriptionRequired. The first array to compare with other arrays. Required. The array to compare to the first array. Optional. Additional array to compare with the first array.

array1
array2
array3,...

Return value:

• Returns an intersection array, which includes all the arrays being compared (array1), Also the value in any other parameter array (array2 or array3 etc.).

• Simply put, the returned intersection value is obtained from the compared array (array1).

Example 1: Compare the values ​​of two arrays and return the intersection:

Example 2: Compare the values ​​of three arrays , and return the intersection

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("e"=>"red","f"=>"black","g"=>"purple");
$a3=array("a"=>"red","b"=>"black","h"=>"yellow");
var_dump($a1);
var_dump($a2);
var_dump($a3);
$result=array_intersect($a1,$a2,$a3);
echo "交集数组：";
var_dump($result);
?>

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