How to determine whether two arrays are consistent in php

In PHP programming, it is a very common requirement to determine whether two arrays are consistent. Especially when processing form submission data, it is often necessary to verify the data submitted by the user. In this case, it is necessary to compare whether the two arrays are the same. Below we introduce several methods to determine whether two arrays are consistent.

Method 1: Use array comparison function

PHP provides several functions for comparing arrays, such as array_diff(), array_intersect(), etc. To determine whether two arrays are consistent, you can use the array_diff_assoc() function. The function of this function is to find the difference between two arrays, but its special feature is that when comparing whether two elements are the same, not only the values ​​but also the key names are compared. The specific format is as follows:

array_diff_assoc ( array $array1 , array $array2 [, array $... ] ) : array

Among them, array1 and array2 are the two arrays to be compared. If the two arrays are the same, an empty array is returned, otherwise the elements in array1 that are different from array2 are returned. The following is a sample code:

$array1 = array('name'=>'Tom', 'age'=>23, 'gender'=>'male');
$array2 = array('name'=>'Tom', 'age'=>24, 'gender'=>'male');
 
if(array_diff_assoc($array1, $array2)==NULL)
{
    echo "两个数组相同";
}
else
{
    echo "两个数组不相同";
}

In this code, two arrays $array1 and $array2 are first defined, then the array_diff_assoc() function is used to compare the two arrays, and finally the two arrays are judged based on the function return result. Are the arrays the same? If the two arrays are the same, the return result is NULL, otherwise the elements of the two arrays that are different are returned.

Method 2: Use loop traversal

In addition to using the array comparison function, you can also compare two arrays by looping through them. The idea is to compare the keys and values ​​of the two arrays respectively. If the key names and key values ​​are the same, the two arrays are considered to be the same. The following is a sample code:

$array1 = array('name'=>'Tom', 'age'=>23, 'gender'=>'male');
$array2 = array('name'=>'Tom', 'age'=>24, 'gender'=>'male');
 
$flag = true; //假设两个数组相同
foreach($array1 as $key=>$value)
{
    if(!isset($array2[$key]) || $array2[$key]!=$value)
    {
        $flag = false; //标识为不相同
        break;
    }
}
if($flag)
{
    echo "两个数组相同";
}
else
{
    echo "两个数组不相同";
}

In this code, two arrays $array1 and $array2 are defined, and then all elements of the $array1 array are looped through to determine whether their keys and values ​​are the same as the $array2 array. same. Two arrays are considered different if any of the keys or values ​​are different. Finally, it is judged whether the two arrays are the same according to the flag $flag.

Method 3: Serialization comparison

Another simple and effective way to compare two arrays is to first convert them into strings through serialization, and then compare them. The specific code is as follows:

$array1 = array('name'=>'Tom', 'age'=>23, 'gender'=>'male');
$array2 = array('name'=>'Tom', 'age'=>24, 'gender'=>'male');
 
if(serialize($array1)==serialize($array2))
{
    echo "两个数组相同";
}
else
{
    echo "两个数组不相同";
}

After converting the two arrays into strings using the serialize() function, then use the "==" operator for comparison. If the two strings are the same, it means two arrays same. The advantage of this method is that it is simple and convenient, but due to the need for serialization and string comparison, it may slightly affect the execution efficiency.

To sum up, there are many methods to compare two arrays, and you can choose the most appropriate method according to the actual situation. No matter which method is used, you should ensure that the key names and key values ​​of the two arrays are consistent before comparison, otherwise the comparison results will be deviated.

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