How to determine whether two arrays intersect in PHP

Judgment steps: 1. Use the array_intersect_assoc() function to compare the key names and key values of the two arrays. The syntax "array_intersect_assoc (array 1, array 2)" will return an intersection array; 2. Use "== The =” operator determines whether the intersection array is empty. The syntax is “intersection array ===[]”. If the intersection array is empty, the two arrays have no intersection. If the intersection array is not empty, the two arrays have intersection.

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

In php, you can use the array_intersect_assoc() function and "===" operator to determine whether the two arrays have intersection.

Implementation steps:

Step 1: Use the array_intersect_assoc() function to compare arrays and find the intersection of the two arrays

array_intersect_assoc The () function is used to compare the key names and key values of two (or more) arrays and return an array containing the intersection elements (an intersection array).

$result=array_intersect_assoc($a1,$a2);

Step 2: Use the "===" operator to determine whether the intersection array is empty

$result===[]

If the intersection array is empty, the two arrays have no intersection. If the intersection If the array is not empty, the two arrays have intersection.

Complete sample code:

"red","b"=>"green","c"=>"blue","d"=>"yellow"); $a2=array("a"=>"red","b"=>"green","c"=>"blue"); $a3=array("a"=>"1","b"=>"2","d"=>"blue"); var_dump($a1); var_dump($a2); echo '$a1 和 $a2对比：'; f($a1,$a2); echo '
'; var_dump($a2); var_dump($a3); echo '$a2 和 $a3对比：'; f($a2,$a3); ?>

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