Hướng dẫn write a php script to count number of lines in a file - viết một tập lệnh php để đếm số dòng trong một tệp

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Cách tiếp cận 1: Tải toàn bộ tệp vào bộ nhớ và sau đó sử dụng hàm Count () để trả về số lượng dòng trong tệp này.

PHP

function getLines($file)
{
    $f = fopen($file, 'rb');
    $lines = 0;

    while (!feof($f)) {
        $lines += substr_count(fread($f, 8192), "\n");
    }

    fclose($f);

    return $lines;
}

function getLines($file)
{
    $f = fopen($file, 'rb');
    $lines = 0;

    while (!feof($f)) {
        $lines += substr_count(fread($f, 8192), "\n");
    }

    fclose($f);

    return $lines;
}

function getLines($file)
{
    $f = fopen($file, 'rb');
    $lines = 0;

    while (!feof($f)) {
        $lines += substr_count(fread($f, 8192), "\n");
    }

    fclose($f);

    return $lines;
}

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function getLines($file)
{
    $f = fopen($file, 'rb');
    $lines = 0;

    while (!feof($f)) {
        $lines += substr_count(fread($f, 8192), "\n");
    }

    fclose($f);

    return $lines;
}

    $filePath

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             +-------------+------------------+---------+
             | This answer | Dominic's answer | wc -l   |
+------------+-------------+------------------+---------+
| Lines      | 3550388     | 3550389          | 3550388 |
+------------+-------------+------------------+---------+
| Runtime    | 1.055       | 4.297            | 0.587   |
+------------+-------------+------------------+---------+

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             +-------------+------------------+---------+
             | This answer | Dominic's answer | wc -l   |
+------------+-------------+------------------+---------+
| Lines      | 3550388     | 3550389          | 3550388 |
+------------+-------------+------------------+---------+
| Runtime    | 1.055       | 4.297            | 0.587   |
+------------+-------------+------------------+---------+

function getLines($file)
{
    $f = fopen($file, 'rb');
    $lines = 0; $buffer = '';

    while (!feof($f)) {
        $buffer = fread($f, 8192);
        $lines += substr_count($buffer, "\n");
    }

    fclose($f);

    if (strlen($buffer) > 0 && $buffer[-1] != "\n") {
        ++$lines;
    }
    return $lines;
}

function getLines($file)
{
    $f = fopen($file, 'rb');
    $lines = 0; $buffer = '';

    while (!feof($f)) {
        $buffer = fread($f, 8192);
        $lines += substr_count($buffer, "\n");
    }

    fclose($f);

    if (strlen($buffer) > 0 && $buffer[-1] != "\n") {
        ++$lines;
    }
    return $lines;
}

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function getLines($file)
{
    $f = fopen($file, 'rb');
    $lines = 0;

    while (!feof($f)) {
        $lines += substr_count(fread($f, 8192), "\n");
    }

    fclose($f);

    return $lines;
}

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Output:

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Cách tiếp cận này tải toàn bộ tệp vào bộ nhớ có thể gây ra sự cố tràn bộ nhớ.We will load only a specific size of data into memory. We don’t care about line breaks at the time of loading. We will iterate on the loaded data to count the number of line breaks in it.

Example:

test.txt: tệp này được sử dụng để kiểm tra tất cả các mã PHP sau

    $filePath

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function getLines($file)
{
    $f = fopen($file, 'rb');
    $lines = 0;

    while (!feof($f)) {
        $lines += substr_count(fread($f, 8192), "\n");
    }

    fclose($f);

    return $lines;
}

function getLines($file)
{
    $f = fopen($file, 'rb');
    $lines = 0;

    while (!feof($f)) {
        $lines += substr_count(fread($f, 8192), "\n");
    }

    fclose($f);

    return $lines;
}

function getLines($file)
{
    $f = fopen($file, 'rb');
    $lines = 0;

    while (!feof($f)) {
        $lines += substr_count(fread($f, 8192), "\n");
    }

    fclose($f);

    return $lines;
}

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function getLines($file)
{
    $f = fopen($file, 'rb');
    $lines = 0;

    while (!feof($f)) {
        $lines += substr_count(fread($f, 8192), "\n");
    }

    fclose($f);

    return $lines;
}

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function getLines($file)
{
    $f = fopen($file, 'rb');
    $lines = 0; $buffer = '';

    while (!feof($f)) {
        $buffer = fread($f, 8192);
        $lines += substr_count($buffer, "\n");
    }

    fclose($f);

    if (strlen($buffer) > 0 && $buffer[-1] != "\n") {
        ++$lines;
    }
    return $lines;
}

function getLines($file)
{
    $f = fopen($file, 'rb');
    $lines = 0; $buffer = '';

    while (!feof($f)) {
        $buffer = fread($f, 8192);
        $lines += substr_count($buffer, "\n");
    }

    fclose($f);

    if (strlen($buffer) > 0 && $buffer[-1] != "\n") {
        ++$lines;
    }
    return $lines;
}

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function getLines($file)
{
    $f = fopen($file, 'rb');
    $lines = 0;

    while (!feof($f)) {
        $lines += substr_count(fread($f, 8192), "\n");
    }

    fclose($f);

    return $lines;
}

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