How to remove elements of a certain field from a two-dimensional array in PHP

Removal steps: 1. Use the foreach statement to traverse the outer elements of the two-dimensional array, the syntax "foreach ($two-dimensional array variable name as $k => $v){//Loop body statement block; }"; 2. In the loop body, use the unset() function to delete the specified element in the two-dimensional array based on the outer element key name "$k" and the field name. The syntax "unset($ two-dimensional array variable name [$k][Specify field name]);".

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

In PHP, you can use the foreach statement and unset () function to remove the elements of the specified field (column) in the two-dimensional array.

Implementation steps:

Step 1:Use the foreach statement to traverse the outer elements of the two-dimensional array

foreach ($二维数组变量名 as $k => $v){
	//循环体语句块;
}

• Traverses the given array, and in each loop, the value of the current array is assigned to $v, and the key name is assigned to $k.

Step 2: In the loop body, use the unset() function to delete the specified element in the two-dimensional array based on the outer element key name $k and field name

unset($二维数组变量名[$k][指定字段名]);

• $Two-dimensional array variable name [outer subscript][inner subscript]You can access the specified elements of the two-dimensional array.
  

Complete sample code:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array(
  array(
    &#39;id&#39; => 1,
    &#39;name&#39; => "小明",
    &#39;score&#39; => 85
  ),
  array(
    &#39;id&#39; => 2,
    &#39;name&#39; => "小华",
    &#39;score&#39; => 92
  ),
  array(
    &#39;id&#39; => 3,
    &#39;name&#39; => "霄晓",
    &#39;score&#39; => 100
  ),
  array(
    &#39;id&#39; => 4,
    &#39;name&#39; => "萧洁",
    &#39;score&#39; => 99
  ),
  array(
    &#39;id&#39; => 5,
    &#39;name&#39; => "赵峰",
    &#39;score&#39; => 96
  )
);
var_dump($arr);
$score=array_column($arr, &#39;score&#39;,"score");
foreach ($arr as $k1 => $v1){
	
	    unset($arr[$k1]["score"]);

}
echo "去掉二维数组中指定字段（列）的元素后:";
var_dump($arr);
?>

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