匹配文本文件中的数字？

Question

我想匹配文本文件中的数字 并将其替换为添加到匹配号码的新号码

似乎无法正常工作

<!---- update textfile on the server after a new order has taken place--->
<?php 


$filename = "order.txt";
$handle = fopen($filename, "r");

$Data = fread($handle, 512); 
echo $Data;
$pattern = "?P<digit>\d+";
preg_match($pattern,$Data,$matches);
print_r($matches);


fclose($handle);


$Handle = fopen($File, 'w');
fwrite($Handle, "The total Number of Apples: ".$Apples.PHP_EOL); 
fwrite($Handle, "The total Number of Bananas: ".$Bananas.PHP_EOL);
fwrite($Handle, "The total Number of Oranges: ".$Oranges.PHP_EOL);

fclose($Handle); 



?>

Answer 1

正如anubhava在评论中所说，你必须用/这样的分隔符包围你的正则表达式，并添加parens以捕获名字组：

$pattern = "/(?P<digit>\d+)/";
preg_match($pattern, $Data, $matches);