How to find the maximum and minimum value of a certain column in a two-dimensional array in PHP

Implementation steps: 1. Use the array_column() function to obtain all elements of the specified column in the two-dimensional array. The syntax "array_column(two-dimensional array, 'specified column name')" will return an array containing all the specified columns. The result array of elements; 2. Use the max() function to calculate the maximum value of the result array, with the syntax "max(result array)"; 3. Use the min() function to calculate the minimum value of the result array with the syntax "min(result array)" .

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

In PHP, you can use the array_column() function , max() function and min() function to find the maximum and minimum values ​​of a column in a two-dimensional array.

Implementation steps:

Step 1. Use the array_column() function to obtain all elements of the specified column in the two-dimensional array

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array(
  array(
    &#39;name&#39; => "小明",
    &#39;score&#39; => 85,
  ),
  array(
    &#39;name&#39; => "小华",
    &#39;score&#39; => 92,
  ),
  array(
    &#39;name&#39; => "霄晓",
    &#39;score&#39; => 100,
  ),
  array(
    &#39;name&#39; => "萧洁",
    &#39;score&#39; => 99,
  ),
  array(
    &#39;name&#39; => "赵峰",
    &#39;score&#39; => 96,
  )
);
var_dump($arr);
$score=array_column($arr, &#39;score&#39;);
var_dump($score);
?>

Step 2: Use the max() function to calculate the maximum value of the result array

$score=array_column($arr, 'score');
var_dump($score);

$max=max($score);
echo "score列的最大值为 $max";

Step 3: Use the min() function to calculate the minimum value of the result array

$score=array_column($arr, 'score');
var_dump($score);

$max=max($score);
echo "score列的最大值为 $max <br>";

$min=min($score);
echo "score列的最小值为 $min";

Function description:

• array_column() can return the value of a single column in the specified array; it will return a result array containing the specified column value (array value is to specify the value of a column).

array_column(array,column_key,index_key);

Parameters	Description
array	Required . Specifies the multidimensional array (record set) to use.
column_key	Required. The column whose value needs to be returned. Can be an integer index of a column of an index array, or a string key value of a column of an associative array. This parameter can also be NULL, in which case the entire array will be returned (very useful when used with the index_key parameter to reset the array key).
index_key	Optional. The column that is the index/key of the returned array.

Return value: Return an array. The value of the array is the value of a single column in the input array.

• max() function

max() function returns the maximum value in an array, or the maximum value among several specified values. maximum value.

max(array_values);

or

max(value1,value2,...);

Parameters	Description
array_values	Required . Specifies an array containing values.
value1,value2,...	Required. Specifies the values ​​to be compared (at least two values).

• min() function

min() function returns the minimum value in an array, or The minimum of several specified values.

min(array_values);

or

min(value1,value2,...);

Parameters	Description
array_values	Required . Specifies an array containing values.
value1,value2,...	Required. Specifies the values ​​to be compared (at least two values).

Recommended study: "PHP Video Tutorial"

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