Move first row from a csv to another using php - php

Question

What I need to do is to be able to move the first row from a testdata.csv every time I run the .php to another .csv with the name testdata_new.csv(appending data).
This is an example of data that includes Name, Age, Job
Example data testdata.csv:
John,32,Scientist
Mary,25,Employer
Nick,36,Designer
Miky,46,Sales
Alex,29,Logistics
This is what the .php will do running it:
Cut the first row from testdata.csv(john,32,scientist) and paste it to the new testdata_new.csv under the first row(header) that will always be "Name Age Job".
Save testdata_new.csv and testdata.csv with the remaining rows.
I did some tests but I'm still far away from the solution.
<?php
$file = "testdata.csv";
$f = fopen($file, "r");
$i = 0;
$file2 = str_replace(".csv", "_new.csv", $file);
$f2 = fopen($file2,"a");
while ($i<2) {
$record = fgetcsv($f);
foreach($record as $field) {
echo $field . "<br>";
}
$i++;
}
fwrite($f2,fread($f, filesize($file)));
fclose($f);
fclose($f2);
?>
Executing the script will display the first row of the template.csv file
and will produce another file with the name template_new.csv with the following rows:
Mary,25,Employer
Nick,36,Designer
Miky,46,Sales
Alex,29,Logistics
What I really need to have in the template_new.csv file is only the first row displayed:
John,32,Scientist
And save again the template.csv without the first row as the idea is to cut and paste the rows, as following:
Mary,25,Employer
Nick,36,Designer
Miky,46,Sales
Alex,29,Logistics
Thank you all in advance for your help!

Answer 1

As easy as this ;-)
$old_file = 'testdata.csv';
$new_file = 'testdata_new.csv';
$file_to_read = file_get_contents($old_file); // Reading entire file
$lines_to_read = explode("\n", $file_to_read); // Creating array of lines
if ( $lines_to_read == '' ) die('EOF'); // No data
$line_to_append = array_shift( $lines_to_read ); // Extracting first line
$file_to_append = file_get_contents($new_file); // Reading entire file
if ( substr($file_to_append, -1, 1) != "\n" ) $file_to_append.="\n"; // If new file doesn't ends in new line I add it
// Writing files
file_put_contents($new_file, $file_to_append . $line_to_append . "\n");
file_put_contents($old_file, implode("\n", $lines_to_read));