How to determine whether the values ​​in an array are the same in php

PHP is a very popular server-side programming language that can handle various types of data, including arrays. In PHP, it is a very common operation to determine whether the values ​​in an array are the same. This article will introduce several methods commonly used in PHP to achieve this function.

Method 1: Use array_unique function

The function of array_unique function is to remove duplicate values ​​in the array and return a new array. If there are duplicate values ​​in the original array, they will only appear once in the new array. You can use this feature to determine whether the values ​​in the array are the same. For example:

$array = array(1, 2, 3, 3, 4);
$newArray = array_unique($array);

if(count($newArray) == 1){
    echo '数组中的值都一样';
}else{
    echo '数组中的值不一样';
}

In the above code, we first define an array $array, which contains several identical values. Then use array_unique to deduplicate the array and assign the result to the variable $newArray. Finally, use the count function to get the length of the new array. If the length is 1, it means that all the values ​​in the original array are the same.

Method 2: Use array_diff function

The array_diff function is to compare the difference between two arrays and return a new array. If there is a value in the first array but not in the second array, the value will be retained in the new array. We can use this feature to determine whether the values ​​in the array are the same. For example:

$array = array(1, 2, 3, 3, 4);
$newArray = array_diff($array, array_unique($array));

if(count($newArray) == 0){
    echo '数组中的值都一样';
}else{
    echo '数组中的值不一样';
}

In the above code, we first define an array $array, which contains several identical values. Then use array_unique to deduplicate the array and pass the result to the array_diff function for comparison. If the new array returned is empty, it means that all the values ​​in the original array are the same.

Method 3: Use for loop

Use for loop to traverse each value in the array, and then determine whether the values ​​in the array are the same through comparison. For example:

$array = array(1, 2, 3, 3, 4);
$count = count($array);
$isTheSame = true;

for($i = 0; $i <p>In the above code, we first define an array $array, which contains several identical values. Then use the count function to get the length of the array and assign the result to the variable $count. Next, we iterate through each value in the array through a for loop and compare whether two adjacent values ​​are equal. If there are unequal values, set the variable $isTheSame to false and break out of the loop. Finally, based on the value of variable $isTheSame, determine whether the values ​​in the array are the same. </p><p>Method 4: Use array_count_values ​​function</p><p>The function of array_count_values ​​function is to count the number of occurrences of each value in the array and return a new array, where the key is the value in the original array and the value is The number of occurrences. If there is only one value in the original array, the new array after statistics will only contain one element. We can use this feature to determine whether the values ​​in the array are the same. For example: </p><pre class="brush:php;toolbar:false">$array = array(1, 2, 3, 3, 4);
$newArray = array_count_values($array);

if(count($newArray) == 1){
    echo '数组中的值都一样';
}else{
    echo '数组中的值不一样';
}

In the above code, we first define an array $array, which contains several identical values. Then use the array_count_values ​​function to count the array and assign the result to the variable $newArray. Finally, use the count function to get the length of the new array. If the length is 1, it means that all the values ​​in the original array are the same.

Summary

By using any of the above methods, you can easily determine whether the values ​​in the array in PHP are the same. Choosing the appropriate method based on the actual situation will help improve the simplicity and readability of the code.

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