Home >Backend Development >PHP Problem >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('content-type:text/html;charset=utf-8');
$arr=array(
array(
'id' => 1,
'name' => "小明",
'score' => 85
),
array(
'id' => 2,
'name' => "小华",
'score' => 92
),
array(
'id' => 3,
'name' => "霄晓",
'score' => 100
),
array(
'id' => 4,
'name' => "萧洁",
'score' => 99
),
array(
'id' => 5,
'name' => "赵峰",
'score' => 96
)
);
var_dump($arr);
$score=array_column($arr, 'score',"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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