How to convert php text to a two-dimensional array

PHP is a very popular programming language that has excellent capabilities in processing text files. Sometimes, we need to convert text files into two-dimensional arrays for more convenient operations in the program. In this article, we will discuss how to convert a text file into a two-dimensional array using PHP.

1. Read text file

First, we need to read the text file into the PHP program. Files can be read using the file function in PHP, which reads the file into an array. The following is the code for reading a file using the file function:

$lines = file('text.txt');

The above code reads each line in the 'text.txt' file into the $lines array. If the file does not exist or cannot be read, the file function will return false.

2. Convert the text file into a two-dimensional array

After reading the text file, we need to convert it into a two-dimensional array. In this article, we assume that the format of each line in the text file is "key:value", where key represents the key of each element in the array, and value represents the value of the element.

The following is the code to convert a text file into a two-dimensional array:

$array = array();
foreach($lines as $line) {
  $parts = explode(':', $line);
  $key = trim($parts[0]);
  $value = trim($parts[1]);
  $array[$key] = $value;
}

The above code first creates an empty array $array, and then loops through each line in the $lines array. In the loop, we use the explode function to split each row into keys and values, and then use the trim function to remove spaces from each element.

Finally, we add the key and value to the $array array as the index and value of the array. In this way, we get a two-dimensional array, where each element in the array corresponds to a line in the text file.

3. Print a two-dimensional array

After converting to a two-dimensional array, we can perform various operations in the program, such as printing each element in the array. The following is the code to print each element in the two-dimensional array:

foreach($array as $key => $value) {
  echo $key . ': ' . $value . '<br>';
}

In the above code, we use a foreach loop to iterate through each element in the array. In the loop, we use $key and $value to represent the keys and values ​​in the array. Finally, we use the echo statement to output the key and value to the screen.

Summary

Through this article, we learned how to use PHP to convert a text file into a two-dimensional array. We first read the file into the program using the file function, then use the explode function to split each line into keys and values, and finally add it to a new array. In the program, we can use this two-dimensional array to perform various operations, such as printing each element in the array.

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