在學校工作中,我使用PHP在我的城市中為虛構的太空博物館建立了一個站點.它具有數(shù)據(jù)包含和數(shù)據(jù)咨詢系統(tǒng),但是我有一個咨詢問題,我想知道該如何解決：如何從文件中刪除最后一個換行符？

數(shù)據(jù)包含

在站點的受限區(qū)域中,我有一個HTML5表單,其中包含5個字段(名稱,地址,電話號碼,性別和參觀的展覽),該表單通過POST方法將數(shù)據(jù)發(fā)送到PHP中的函數(shù),該函數(shù)將其寫入給定的txt文件中通過使用fwrite命令：

fwrite ($pointer, "$name | $addres | $telephone | $sex | $exhibitions " .PHP_EOL);

如您所見,它在txt文件中寫入在表單上輸入的數(shù)據(jù),以及一個換行符.指針是fopen用于打開我需要工作的文件的變量.輸出示例：

Márcio Aguiar | Belmiro Braga Street | 1234-5678 | M | Planets of Solar System
Joana Tobias | Santos Dummont Avenue | 8765-4321 | F | Black Holes, Satellites

資料咨詢

然后是一個咨詢系統(tǒng).它具有一個循環(huán),直到文件結束為止.在此循環(huán)中,有一個名為$buffer的變量,該變量每次都獲取txt文件的一行.然后將其分解以創(chuàng)建一個名為$lines [$counter]的數(shù)組.為了更好地打印它,我使用了array_combine,其中將另一個數(shù)組($keys)上的字段名稱連接到以$lines [$counter]編寫的值,并將其附加到$combined [$counter].然后循環(huán)結束,我在< pre>< / pre>中使用了print_r.查看以$combined編寫的數(shù)據(jù),同時保留HTML否則會忽略的空格和中斷.這是代碼：

$keys = array ("Name", "Address", "Telephone", "Sex", "Visited exhibition");
for ($counter=0;!feof($reader);$counter  ){
    $buffer = fgets($reader);
    $lines[$counter] = explode(" | ", $buffer);
    $combined[$counter] = array_combine($keys, $lines[$counter]);
}
echo "<pre>";
print_r($combined);
echo "</pre>";

輸出示例：

06002

在這里您可以看到2數(shù)組已創(chuàng)建為空白.這是由最后一行引起的,該行僅包含上面表格插入的換行符.我需要刪除最后一個換行符,并且只刪除那個,但不知道如何.我想知道！當執(zhí)行到達array_combine時,不知道會導致錯誤顯示,因為需要兩個數(shù)組具有相同數(shù)量的元素,并且2為空.這里的錯誤：

Warning: array_combine(): Both parameters should have an equal number of elements in E:\Aluno\Documents\Wamp\www\trab_1\area_restrita\consulta.php on line 60

解決方法:

原始答案：

要從任何文本中刪除尾隨換行符,可以使用trim(),但是對于您而言,您只需要在append mode中使用fopen：

$handle = fopen("/path/to/file", "a");

然后擺脫PHP_EOL：

fwrite ($pointer, "$name | $addres | $telephone | $sex | $exhibitions");

編輯：您是對的,追加不會追加到新行.我誤解了.因此,您可以像我之前提到的那樣使用trim().我使用file_get_contents()和file_put_contents()創(chuàng)建了一個簡單的示例,它似乎可以滿足您的要求：

<?php

$file = 'test.txt';

// Set existing contents (for testing sake)
$orig_contents = "bob | 123 fake street | 1234567890 | yes, please | no\n";
$orig_contents .= "bob | 123 fake street | 1234567890 | yes, please | no\n";
$orig_contents .= "bob | 123 fake street | 1234567890 | yes, please | no\n";
$orig_contents .= "bob | 123 fake street | 1234567890 | yes, please | no\n";
file_put_contents($file, $orig_contents);

// Here is how you could add a single new line with append mode
// Notice the trailing \n
file_put_contents($file, "billy | 456 fake street | 2345678901 | no | yes\n", FILE_APPEND);

// Get contents from the file and remove any trailing line breaks
$contents = trim(file_get_contents($file));

$keys = array ("Name", "Address", "Telephone", "Sex", "Visited exhibition");

// Explode based on the new line character
$lines = explode("\n", $contents);

foreach ($lines as $line) {
    $values = explode(" | ", $line);
    $combined[] = array_combine($keys, $values);
}

print_r($combined);

打?。?/p>

Array
(
    [0] => Array
        (
            [Name] => bob
            [Address] => 123 fake street
            [Telephone] => 1234567890
            [Sex] => yes, please
            [Visited exhibition] => no
        )

    [1] => Array
        (
            [Name] => bob
            [Address] => 123 fake street
            [Telephone] => 1234567890
            [Sex] => yes, please
            [Visited exhibition] => no
        )

    [2] => Array
        (
            [Name] => bob
            [Address] => 123 fake street
            [Telephone] => 1234567890
            [Sex] => yes, please
            [Visited exhibition] => no
        )

    [3] => Array
        (
            [Name] => bob
            [Address] => 123 fake street
            [Telephone] => 1234567890
            [Sex] => yes, please
            [Visited exhibition] => no
        )

    [4] => Array
        (
            [Name] => billy
            [Address] => 456 fake street
            [Telephone] => 2345678901
            [Sex] => no
            [Visited exhibition] => yes
        )

)