How to input a two-dimensional array in php

In PHP development, two-dimensional array is a very practical data structure. Each element in a two-dimensional array is an array containing multiple values. For example, if you need to record a student's name, age, gender, scores and other information, you can use a two-dimensional array to store this information.

In PHP, the method of inputting a two-dimensional array is very simple. You can use the following methods:

1. Use the array() function to manually input

Manually entering a two-dimensional array using the array() function allows you to use an array within each row of the array, with each array representing a list of values. Here is an example of a student list containing four values ​​​​of "name", "age", "gender" and "score":

$studentArray = array(
  array('Alice', 18, 'female', 90),
  array('Bob', 19, 'male', 87),
  array('Cathy', 17, 'female', 94),
  array('David', 20, 'male', 91),
);

In the above code, we declare a binary named $studentArray Dimensional array, where each sub-array represents a student's information, including "name", "age", "gender" and "score".

2. Use the [] operator to enter directly

Another method is to enter all the values ​​directly within the [] operator, similar to a nested array. For the above student list, you can use this method again to declare a two-dimensional array:

$studentArray = [
  ['Alice', 18, 'female', 90],
  ['Bob', 19, 'male', 87],
  ['Cathy', 17, 'female', 94],
  ['David', 20, 'male', 91],
];

Similar to manual input using the array() function, this syntax allows us to input a two-dimensional array more conveniently, and in It's also visually cleaner.

3. Dynamic input

We can also dynamically input a two-dimensional array while the program is running. For example, we can read a CSV file and store the file contents as a two-dimensional array, which makes data processing very convenient.

The following is a sample code that uses the fopen() function to open a CSV file and store its contents as a two-dimensional array:

$filename = 'student.csv';
$file = fopen($filename, 'r');
$studentArray = [];

// 循环读取CSV文件的每一行
while (($row = fgetcsv($file)) !== false) {
  $studentArray[] = $row;
}

fclose($file);

In the above code, we declare a file named $ An empty array of studentArray, and a file named student.csv was opened using the fopen() function. Then, in the while loop, we use the fgetcsv() function to read each line of the CSV file with commas as delimiters and store it as an array. Finally, we add this array to $studentArray using the [] operator.

Conclusion

There are many ways to input two-dimensional arrays in PHP. Manual input using the array() function or [] operator is the most common method. Dynamic input can be done by reading a file or obtaining a two-dimensional array from other data sources. Either way, it only takes a few practices to master.

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