Question

我有一个名为test.txt的文件，我想删除此文件中长度小于30个字符的行，并且以大写字母开头并以点或问号结尾的行不应删除

例如test.txt文件的内容是：

text 1
text 2
text 3
Long text.
text 4
Long text 2?

过滤后，结果应为

Long text.
Long text 2?

 <?php


# create and load the HTML
include('simple_html_dom.php');


$tekst = file_get_html('http://www.naszawiedza.pl/')->plaintext;

foreach ($tekst as $key=>&$value) {
    if (strlen($value) > 60) {
        unset($yourArray[$key]);
    }
}

echo $tekst;

//kropka
    $string = $tekst;
    $substr = '.';
    $attachment = "\r\n";
    //$position = strpos($string, 'a');
    $newstring = str_replace($substr, $substr.$attachment, $string);
    // bca+++def a+++bcdef

//znak zapytania
$string = $tekst;
    $substr = '?';
    $attachment = "\r\n";
    //$position = strpos($string, 'a');
    $newstring = str_replace($substr, $substr.$attachment, $string);
    // bca+++def a+++bcdef
//podwójna spacja
$string = $tekst;
    $substr = '\r\n\r\n';
    $attachment = "\r\n";
    //$position = strpos($string, 'a');
    $newstring = str_replace($substr, $substr.$attachment, $string);
    // bca+++def a+++bcdef

//Wykrzyknik
    $string = $tekst;
    $substr = '!';
    $attachment = "\r\n";
    //$position = strpos($string, 'a');
    $newstring = str_replace($substr, $substr.$attachment, $string);
    // bca+++def a+++bcdef

//tabulator
    $string = $tekst;
    $substr = ' ';
    $attachment = "\r\n";
    //$position = strpos($string, 'a');
    $newstring = str_replace($substr, $substr.$attachment, $string);
    // bca+++def a+++bcdef
    echo $newstring;





    // zmienna $dane, która będzie zapisana 
// może także pochodzić z formularza np. $dane = $_POST['dane']; 
$dane = $newstring; 

// przypisanie zmniennej $file nazwy pliku 
$file = "testy.txt"; 



// uchwyt pliku, otwarcie do dopisania 
$fp = fopen($file, "a"); 

// blokada pliku do zapisu 
flock($fp, 2); 

// zapisanie danych do pliku 
fwrite($fp, $dane); 

// odblokowanie pliku 
flock($fp, 3); 

// zamknięcie pliku 
fclose($fp); 








//usun puste wiersze
$plik = "testy.txt";

// odczyt
$bufor = array();
$fd = fopen($plik, "r");
while (!feof ($fd)) 
{
    $linia = fgets($fd, 1024);
    if(strlen(trim($linia)))
    {
        $bufor[] = $linia;
    }    
}
fclose($fd);

// zapis 
$fdw = fopen($plik, "w");
foreach($bufor as $wiersz)
{
    fwrite($fdw, $wiersz);
}
fclose($fdw);

Answer 1

以下是一个可以执行此操作的示例代码

test.txt内容：

text 1
text 2
Long text.
text3
Long text 2?
Line with 30 characters ending with a question mark?
text4

<?php

$file = fopen("test.txt", "r");

$i = 0;
$string = "";

while(!feof($file))
{
    // get the line
    $line = trim(fgets($file));

    // check if line have 30 characters
    if(strlen($line) > 30)
    {

        // get first character ascai value
        $value = ord(substr($line, 0, 1));

        // get the last character
        $last = substr($line, -1);

        // now check if it has allowed criteria
        if((($value >= 65 && $value <= 90) &&  ($last == '.' || $last == '?')))
        {
            $string .= $line."\n";
        }
    }
}
fclose($file);

// put the proccessed content back to file
file_put_contents("test.txt", trim($string));
?>

执行代码后输出

Line with 30 characters ending with a question mark?

希望它会帮助你

Answer 2

完整的程序代码。它给了我空文件。这里应该只有超过30个字符的句子，开头有大写字母，末尾有问号或点。

<?php


# create and load the HTML
include('simple_html_dom.php');


$tekst = file_get_html('http://www.naszawiedza.pl/')->plaintext;

foreach ($tekst as $key=>&$value) {
    if (strlen($value) > 60) {
        unset($yourArray[$key]);
    }
}

echo $tekst;

//kropka
    $string = $tekst;
    $substr = '.';
    $attachment = "\r\n";
    //$position = strpos($string, 'a');
    $newstring = str_replace($substr, $substr.$attachment, $string);
    // bca+++def a+++bcdef

//znak zapytania
$string = $tekst;
    $substr = '?';
    $attachment = "\r\n";
    //$position = strpos($string, 'a');
    $newstring = str_replace($substr, $substr.$attachment, $string);
    // bca+++def a+++bcdef
//podwójna spacja
$string = $tekst;
    $substr = '\r\n\r\n';
    $attachment = "\r\n";
    //$position = strpos($string, 'a');
    $newstring = str_replace($substr, $substr.$attachment, $string);
    // bca+++def a+++bcdef

//Wykrzyknik
    $string = $tekst;
    $substr = '!';
    $attachment = "\r\n";
    //$position = strpos($string, 'a');
    $newstring = str_replace($substr, $substr.$attachment, $string);
    // bca+++def a+++bcdef

//tabulator
    $string = $tekst;
    $substr = ' ';
    $attachment = "\r\n";
    //$position = strpos($string, 'a');
    $newstring = str_replace($substr, $substr.$attachment, $string);
    // bca+++def a+++bcdef
    echo $newstring;





    // zmienna $dane, która będzie zapisana 
// może także pochodzić z formularza np. $dane = $_POST['dane']; 
$dane = $newstring; 

// przypisanie zmniennej $file nazwy pliku 
$file = "testy.txt"; 



// uchwyt pliku, otwarcie do dopisania 
$fp = fopen($file, "a"); 

// blokada pliku do zapisu 
flock($fp, 2); 

// zapisanie danych do pliku 
fwrite($fp, $dane); 

// odblokowanie pliku 
flock($fp, 3); 

// zamknięcie pliku 
fclose($fp); 

//usun puste wiersze
$plik = "testy.txt";

// odczyt
$bufor = array();
$fd = fopen($plik, "r");
while (!feof ($fd)) 
{
    $linia = fgets($fd, 1024);
    if(strlen(trim($linia)))
    {
        $bufor[] = $linia;
    }    
}
fclose($fd);

// zapis 
$fdw = fopen($plik, "w");
foreach($bufor as $wiersz)
{
    fwrite($fdw, $wiersz);
}
fclose($fdw);

$file = fopen("testy.txt", "r");

$i = 0;
$string = "";

while(!feof($file))
{
    // get the line
    $line = trim(fgets($file));

    // check if line have 30 characters
    if(strlen($line) > 30)
    {

        // get first character ascai value
        $value = ord(substr($line, 0, 1));

        // get the last character
        $last = substr($line, -1);

        // now check if it has allowed criteria
        if((($value >= 65 && $value <= 90) &&  ($last == '.' || $last == '?')))
        {
            $string .= $line."\n";
        }
    }
}
fclose($file);

// put the proccessed content back to file
file_put_contents("testy.txt", trim($string));
?>

PHP如何从文件中删除字符串

2 个答案: