php - sort the unsorted text file and rewrite to same text file in sorted order

Question

Hi, I have a question. I am in process of learning how to read/write files, but having little trouble trying to do both at the same time in same php script. I have a text file with words like this,

Richmond,Virginia
Seattle,Washington
Los Angeles,California
Dallas,Texas
Jacksonville,Florida

I wrote a code to sort them in order and this will display in sort order by City.

<?php
$file = file("states.txt");
sort($file);
for($i=0; $i<count($file); $i++)
{
  $states = explode(",", $file[$i]);
  echo $states[0], $states[1],"<br />";
}
?>

From this, how can I rewrite those sorted information back into the states.txt file?

Thanks for your help.

Answer 1

Once you are done reading the file into the array by a call to file. You can open the file for writing by using the fopen function, write into the file using the fwrite and close the file handle using fclose:

<?php
$file = file("states.txt");                  // read file into array.
$fh = fopen('states.txt','w') or die("..."); // open same file for writing.
sort($file);
for($i=0; $i<count($file); $i++)
{
    $states = explode(",", $file[$i]);
    echo $states[0], $states[1],"<br />";
    fwrite($fh,"$states[0],$states[1] <br />"); // write to file.
}
fclose($fh); // close file.
?>

Answer 2

Try using fopen and fwrite.

$fileWrite = fopen("filePah", "w");

for($i=0; $i<count($file); $i++)
{
    fWrite($fileWrite, $file[i]);
}
fClose($fileWrite);

Answer 3

<?php
$file = file("states.txt");
sort($file);
$newContent = "";
for($i=0; $i<count($file); $i++)
{
  $states = explode(",", $file[$i]);
  $newContent .= $states[0] .', '. $states[1] . PHP_EOL;
}

file_put_contents('states.txt',$newContent);
?>

PHP: file_put_contents

Answer 4

Open the file, write to it, close it (this assumes $file is the variable from your code):

$fp = fopen('states.txt', 'w');
for($i=0; $i<count($file); $i++)
    fwrite($fp, $file[$i]);
}
fclose($fp);

And see http://php.net/manual/en/function.fwrite.php

Answer 5

The easiest way to write the contents of $file back to the file would be using file_put_contents in collaboration with implode.

file_put_contents("states.txt", implode($file));

Answer 6

Try something like this:

$fo = fopen("filename", "w");
$content = "";
for ($i = 0; $i < count($file); $i++) {
    $states = explode(",", $file[$i]);
    $content .= $states[0] . "," . $states[1] . "\n";
}
fwrite($fo, $content);
fclose($fo);

Answer 7

im trying to do a sort array what i'm i missing?

"; } fclose($file1);

?>