How to remove maximum value from array in PHP

PHP is a currently popular server-side scripting language that supports the development of dynamic web pages, Web applications and server-side applications. When using PHP to process an array, sometimes you need to delete the maximum value in the array. This article will introduce how to delete the maximum value in the array in PHP.

First, we need to understand how to get the maximum value in an array in PHP. PHP provides a built-in function max() that can be used to obtain the maximum value in an array. The following is a sample code:

<?php     $array = array(4, 5, 1, 3, 2);
    $max_value = max($array);
    echo "The maximum value in the array is: " . $max_value;
?>

The output of the above code is:

The maximum value in the array is: 5

Next, we will introduce how to delete the maximum value in an array in PHP. There are several ways to achieve this:

Method 1: Use array_search() and unset()Function

array_search( ) function can be used to find the index of a specified value in an array. Combined with the unset() function, the element corresponding to the specified index can be deleted from the array. The following is a sample code:

<?php     $array = array(4, 5, 1, 3, 2);
    $max_value = max($array);
    $max_index = array_search($max_value, $array);
    unset($array[$max_index]);
    print_r($array);
?>

The output of the above code is:

Array
(
    [0] => 4
    [2] => 1
    [3] => 3
    [4] => 2
)

In the above code, first use the max() function to obtain the maximum value in the array , then use the array_search() function to find the index of the maximum value in the array, and finally use the unset() function to delete the element corresponding to the index. The final output is the new array after removing the maximum value.

Method 2: Use array_diff()function and max()function

array_diff()function can be used Compare the differences between multiple arrays and return the difference set. Combined with the max() function, the maximum value can be deleted from the array. The following is a sample code:

<?php     $array = array(4, 5, 1, 3, 2);
    $max_value = max($array);
    $new_array = array_diff($array, array($max_value));
    print_r($new_array);
?>

The output of the above code is:

Array
(
    [0] => 4
    [2] => 1
    [3] => 3
    [4] => 2
)

In the above code, first use the max() function to obtain the maximum value in the array , and then pass the maximum value as a parameter to the array_diff() function to get a new array. The final output is the new array after removing the maximum value.

Method 3: Use array_splice()function and array_search()function

array_splice()function can be used Removes elements within a specified range from an array. Combined with the array_search() function, the maximum value can be deleted from the array. The following is a sample code:

<?php     $array = array(4, 5, 1, 3, 2);
    $max_value = max($array);
    $max_index = array_search($max_value, $array);
    array_splice($array, $max_index, 1);
    print_r($array);
?>

The output of the above code is:

Array
(
    [0] => 4
    [2] => 1
    [3] => 3
    [4] => 2
)

In the above code, first use the max() function to obtain the maximum value in the array , then use the array_search() function to find the index of the maximum value in the array, and finally use the array_splice() function to delete the element corresponding to the index. The final output is the new array after removing the maximum value.

In actual development, which method to choose to delete the maximum value in the array depends on actual needs and personal preferences. The three methods introduced above can all solve this problem well.

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