How to create an associative array table in php

With the continuous development of Internet technology, the development of Web applications has become more and more important. Among them, the associative array table is a data structure commonly used in web applications. It can store data in groups according to columns and rows, and can be easily displayed in the front-end interface. So, how to create an associative array table using PHP? This article will introduce you one by one.

1. Create an associative array

In PHP, we can use associative arrays to store data. Associative arrays are arrays indexed by strings. Compared to indexed arrays (arrays that use numbers as indexes), associative arrays are more flexible and can directly access each element through the index.

The following example code creates an associative array, containing three columns: student name, age and grade:

$students = array(
    array("姓名", "年龄", "成绩"),
    array("张三", 18, 80),
    array("李四", 20, 85),
    array("王五", 19, 90)
);

In the above code, we use a two-dimensional array to create an associative array, The first dimension stores the names of the table's columns, while the second dimension stores the data for each row.

2. Display the associative array

After we successfully create the associative array, the next step is to display it in the front-end interface. We can use HTML tables to display associative arrays.

The following is a simple sample code that traverses the associative array through a for loop and presents each row of data as a row of HTML tables:

<table>
  <?php
    foreach ($students as $row) {
        echo "<tr>";
        foreach ($row as $data) {
            echo "<td>" . $data . "</td>";
        }
        echo "</tr>";
    }
  ?>
</table>

In the above code, we use two foreach loops , the outer loop traverses each row, and the inner loop traverses each column. In the loop, we wrap each element with the HTML td tag to display the data in a table.

3. Filter associative arrays based on conditions

Sometimes we need to filter out certain rows of data based on certain conditions. In this case, we can use Implemented using the array_filter function in PHP.

The following sample code uses the array_filter function to filter out student information with scores greater than or equal to 85 points:

$new_students = array_filter($students, function($row) {
    return $row[2] >= 85;
});

In the above code, we use an anonymous function as the callback function, which is used Filter student data. When the function returns true, it means that the row of data needs to be filtered out.

4. Search the associative array based on keywords

Another common requirement is to search the associative array based on keywords and filter out row data that meets the conditions. At this time, we can use the array_search function in PHP to achieve this.

The following sample code uses the array_search function to find the row named "Zhang San" in the table:

$index = array_search("张三", array_column($students, 0));
$row = $students[$index];

In the above code, we use the array_column function to convert the two-dimensional array into a one-dimensional array. dimensional array, and then use the array_search function to find the index position of the specified keyword in the array. Finally, we find the row of data based on the index position.

5. Conclusion

The above are some methods and techniques on how to use PHP to create an associative array table, as well as how to filter and search associative arrays based on conditions. Of course, in practice, we can further optimize the program according to specific needs, and we can use CSS to add styles to the table to make it more beautiful. I hope this article can provide reference and help to readers.

The above is the detailed content of How to create an associative array table in php. For more information, please follow other related articles on the PHP Chinese website!