我想获取列的列表而不是 中的行implode，但是它给了我一个错误，但是当我使用数组的索引号时给了我一行的结果。
<?php
// this is the database connection
$session_id = session_start();
$con = mysqli_connect("localhost", "root", "", "ecommerce");
?>
<!DOCTYPE html>
<html>
<head>
<title>array</title>
</head>
<body>
<?php
$sql_select = "SELECT * FROM cart";
$run_select = mysqli_query($con, $sql_select);
$datas = [];
if(mysqli_num_rows($run_select) > 0) {
while($show = mysqli_fetch_assoc($run_select)) {
$id[] = $show;
}
}
$avengers = implode(",", $id['1']);
// i want to echo out the columns this is giving me the rows
echo $avengers;
while ($show = mysqli_fetch_assoc($run_select)) {
$id[] = $show;
}
$avengers = array_column($id, 'COLUMN_NAME');
print_r($avengers);
它将表或数组中的列名/变量名作为字符串返回一个简单的数组，这是我动态构建 MySQL 查询所需的。
解释：-
<?php
// An array that represents a possible record set returned from a database
$a = array(
array(
'id' => 5698,
'first_name' => 'Peter',
'last_name' => 'Griffin',
),
array(
'id' => 4767,
'first_name' => 'Ben',
'last_name' => 'Smith',
),
array(
'id' => 3809,
'first_name' => 'Joe',
'last_name' => 'Doe',
)
);
$last_names = array_column($a, 'last_name');
print_r($last_names);
?>
输出：
Array
(
[0] => Griffin
[1] => Smith
[2] => Doe
)
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我来说两句