PHP determines whether there is a value in two arrays

In PHP, it is often necessary to compare or search two arrays. One common operation is to determine whether two arrays have the same key value.

To determine whether two arrays have the same key value, you can use two methods in PHP:

1. array_intersect_key() function

array_intersect_key() The function can be used to get elements with the same key value in two arrays. Use this function to first obtain the elements with the same key value in the two arrays, and then determine whether their values ​​are the same. The format of this function is:

array_intersect_key(array1, array2)

The sample code is as follows:

<?php
    $arr1 = array('a'=>1, 'b'=>2, 'c'=>3);
    $arr2 = array('d'=>4, 'b'=>5, 'f'=>6);
    $result = array_intersect_key($arr1, $arr2);
    if(count($result) > 0) {
        echo "存在相同键值";
    } else {
        echo "不存在相同键值";
    }
?>

The code first defines two arrays $arr1 and $arr2, each containing different key values. Then use the array_intersect_key() function to obtain the elements with the same key value in the two arrays, save them in the $result array, and finally determine whether there are elements in the array.

2. array_intersect_assoc() function

array_intersect_assoc() function can also be used to get elements with the same key value in two arrays, but it will consider the key value and key name Same situation at the same time. Use this function to determine whether the key values ​​and key names that exist in two arrays are the same. The format of this function is:

array_intersect_assoc(array1, array2)

The sample code is as follows:

<?php
    $arr1 = array('a'=>1, 'b'=>2, 'c'=>3);
    $arr2 = array('d'=>4, 'b'=>5, 'f'=>6);
    $result = array_intersect_assoc($arr1, $arr2);
    if(count($result) > 0) {
        echo "存在相同键值和键名";
    } else {
        echo "不存在相同键值和键名";
    }
?>

This code is similar to the above sample code, except that the array_intersect_assoc() function is used to determine whether there are the same key values ​​and key names. element.

Summary

In PHP, using the array_intersect_key() and array_intersect_assoc() functions can easily determine whether two arrays have elements with the same key value and key name. When using these functions, please note that the function returns an array, and you need to use the count() function to determine whether there are the same elements.

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