How can PHP read the last few lines of a file?

In PHP, you can use the file() function to read the contents of a file. This function reads each line of the file into an element of an array. Then, you can use array-related functions to manipulate the array data, such as reading the last few lines of data.

Here is an example code of reading the last few lines of a file.

<?php
// 要读取的文件路径
$filePath = "path/to/file.txt";

// 读取文件内容到数组
$fileContentArray = file($filePath);

// 获取要读取的最后几行数目
$lastLines = 5;

// 确保要读取的行数不超过文件总行数
if ($lastLines > count($fileContentArray)) {
    $lastLines = count($fileContentArray);
}

// 获取最后几行的数组切片
$lastLinesArray = array_slice($fileContentArray, -$lastLines);

// 输出最后几行数据
foreach ($lastLinesArray as $line) {
    echo $line;
}
?>

In the example code above, the file content is first read into the $fileContentArray array using the file() function. Then, the number of elements in the array (i.e., the total number of lines in the file) can be obtained using the count() function.

Next, based on the demand, specify the number of last lines to be read and store them in the $lastLines variable. Then, by comparing $lastLines with the total number of lines in the file, ensure that the number of lines to be read does not exceed the total number of lines in the file.

Finally, use the array_slice() function to extract a slice of the last few lines from the $fileContentArray array and store it in $lastLinesArray. Then, you can output the data of the last few lines by iterating through the $lastLinesArray array.