PHP是否写入文件

Question

i tried to search, but still dont know the solution at all, for my next PHP code.

<?php
    $city="Budapest"; // Your city
    $country="hu"; // Two digit country code
    $url="http://api.openweathermap.org/data/2.5/weather?q=".$city.",".$country."&appid=2de143494c0b295cca9337e1e96b00e0&units=metric";
    $json=file_get_contents($url);
    $data=json_decode($json,true);
    $file = '/home/cs2d/sys/lua/weather.dat';
    $current = file_get_contents($file);
    $current .= $data['weather'][0]['main']."
".$data['main']['temp']."
";
    // Write the contents back to the file
    file_put_contents($file, $current);
?>

As you can see it's a simple code, which write values into the weather.dat file. But how to possible to do that its just refresh lines instead of add new one.

Any idea?

Answer 1

This works :

$city="Budapest"; // Your city
$country="hu"; // Two digit country code
$url="http://api.openweathermap.org/data/2.5/weather?q=".$city.",".$country."&appid=2de143494c0b295cca9337e1e96b00e0&units=metric";
$json=file_get_contents($url);
$data=json_decode($json,true);
$file = 'weather.dat';

$current = file_get_contents($file);
$contents = file_get_contents($file);
echo $current;
$contents = str_replace($current, ' ', $contents);
echo $contents;

file_put_contents($file,$contents);
$current = file_get_contents($file);
$current .= $data['weather'][0]['main']."
".$data['main']['temp']."
";
// Write the contents back to the file
file_put_contents($file, $current);