如何找到包含字符串文件中的行，并在该行

Question

我有文件的最后添加一些编辑包含：

Categories, 
Diamond,10,11, 
Coal,21,21, 

如何在行含“钻石”的末尾添加字符串？

我有的是代码，可以在文件的末尾添加字符串，但不知道如何使它以添加字符串specyfic行：

$function_Result = mysql_fetch_row($function_Ask, 0); 

$file_To_Edit = "item_Data.csv"; 
$opened_File = fopen($file_To_Edit, 'w') or die("Error. Code:2 - Can not open file $file_To_Edit"); 

$string_Data = $function_Result[0] . ","; 
fwrite($opened_File, $string_Data); 
fclose($opened_File); 

Answer 1

我应该使用preg_replace如果文件内容不是太大。对大文件时

$content = file_get_contents('file.txt'); 
/* in case of unwanted \r */ $content = str_replace("\r", '', $content); 
$content = preg_replace("#^(Diamond.*)$#m", '$1' . $append, $content); 
file_put_contents('file.txt', $content); 

Answer 2

<?php 

$string_Data = '444555'; 

$file_To_Edit = "./11.csv"; 

$opened_File = file($file_To_Edit) or die("Error. Code:2 - Can not open file $file_To_Edit"); // Reads entire file into array of file lines 

$diamond_lines = preg_grep('#^Diamond#', $opened_File); // Finds array with line started with 'Diamonds' 

foreach(array_keys($diamond_lines) as $key) { // Runs 'Diamonds' array 

    $opened_File[$key] = substr($opened_File[$key], 0, -1) . $string_Data; // Removes the last character from 'Diamond' line (new line chracter) and adds $string_Data variable at the end 

} 

//var_dump($opened_File); 

$f = fopen($file_To_Edit, 'w'); 

fwrite($f, implode("\n", $opened_File)); // Writes new .CSV file 

fclose($f); 

?> 

Answer 3

所有以前发布的解决方案可能会失败。这是一个适用于任何大小文件的文件。 （如果文件可读可写等，应该添加一些检查）

<?php 
$file = "item_Data.csv" 
$tmpFile = $file .".tmp"; 

$in = fopen($file, "r") 
$out = fopen($tmpFile, "w") 

while (($buffer = fgets($in)) !== false) { 

    if (preg_match('/my search pattern/', $buffer)) { 

     $buffer .= 'append this to the matched line'; 
    } 

    fwrite($out, $buffer); 
} 

fclose($in); 
fclose($out); 
unlink($file); 
rename($tmpFile, $file); 

?>