Remove first line in CSV and then save the file overwriting existing - php

I have a CSV file which is generated dynamically. I want to remove the first line of CSV and then save it again.
I have googled and was able to get first line of csv but the part of writing it again after removing is where I am stuck.
Here is example
line1,data1
line2,data2
line3,data3
What I want to acheive
line2,data2
line3,data3
That is first line removed and file saved again
Here is my code
$file = fopen('words.csv', 'r');
$data = fgetcsv($file,10000,",");
$data = array_shift($data);
$file = fopen('words.csv', 'w');
fputcsv($file,$data,",");
fclose($file);
I get this:
! ) Warning: fputcsv() expects parameter 2 to be array, string given in C:\wamp\www\scrape\test.php on line 7
And output file is empty.
Ahmar

// Read the file
$file = fopen('words.csv', 'r');
// Iterate over it to get every line
while (($line = fgetcsv($file)) !== FALSE) {
// Store every line in an array
$data[] = $line;
}
fclose($file);
// Remove the first element from the stored array / first line of file being read
array_shift($data);
// Open file for writing
$file = fopen('words.csv', 'w');
// Write remaining lines to file
foreach ($data as $fields) {
fputcsv($file, $fields);
}
fclose($file);

You have some errors in your code. The first one is that fgetcsv function only gets one line so if you want to extract all the lines you need a loop. The same happens with fputcsv function.
The other one is that array_shift function returns the shifted value so you are assigning to $data the string you don't need.
So, I think your code must be like:
$file = fopen('words.csv', 'r');
$data=array();
while (($data_tmp = fgetcsv($file, 1000, ",")) !== FALSE) {
$data[] = $data_tmp;
}
fclose($file);
array_shift($data);
$file = fopen('words.csv', 'w');
foreach($data as $d){
fputcsv($file,$d);
}
fclose($file);

Related

How do I read the last line to the first file in PHP?

I have it where it prints the file to the body but I need to do that but have the file's data load from the last line to the first.
The code I have right now
$file = fopen('text.txt','r');
while ($line = fgets($file)) {
echo($line);
}
fclose($file);
Use file() to read the file into an array of lines. Then you can reverse the array and loop through it.
$lines = file('text.txt');
$lines = array_reverse($lines);
foreach ($lines as $line) {
echo $line;
}

Convert a CSV file to force encapsilation

My ideal fix would be a function that can take a CSV file that does not have forced encapsulation (no quotes around values if the value has no spaces or is just a number) and convert it into a CSV file that makes sure every field is encapsulated with double quotes.
<?php
$raw_file = BASE_DIR."pathto/csv.csv";
$fixed_file = BASE_DIR."pathto/fixed.csv";
convert_file($raw_file, $fixed_file);
//move on with life!!
?>
Thanks for you help!
Use fgetcsv to get the contents of your original csv file and fputcsv (using the fourth parameter) to build the encapsulated file.
For example, supposing your column separator is ; :
<?php
$raw_file = BASE_DIR."pathto/csv.csv";
$fixed_file = BASE_DIR."pathto/fixed.csv";
// Getting contents
$raw_handle = fopen($raw_file, 'r');
$contents = array();
while (($data = fgetcsv($raw_handle, 0, ';')) !== false) {
$contents[] = $data;
}
fclose($raw_handle);
// Putting contents
$fixed_handle = fopen($fixed_file, 'w');
foreach ($contents as $line) {
fputcsv($fixed_handle, $line, ';', '"');
}
fclose($fixed_handle);
//move on with life!!
?>

fgetcsv skip blank lines in file

I have this script that I did, it basically grabs all the files in my "logs" folder and merge them all in one array file, my only problem is that, sometimes the script breaks if there is blank line or empty line! how can I tell it to automatically skip blank empty lines and go to next? blank lines are not necessarily at the top or bottom! could be in the middle of the csv file
<?php
$csv = array();
$files = glob('../logs/*.*');
$out = fopen("newfile.txt", "w");
foreach($files as $file){
$in = fopen($file, "r");
while (($result = fgetcsv($in)) !== false)
{
$csv[] = $result;
}
fclose($in);
fclose($out);
}
print json_encode(array('aaData' => $csv ));
?>
As you can read in the documentation for fgetcsv():
A blank line in a CSV file will be returned as an array comprising a single null field, and will not be treated as an error.
Checking for that before adding it to your data array should be sufficient:
while (($result = fgetcsv($in)) !== false) {
if (array(null) !== $result) { // ignore blank lines
$csv[] = $result;
}
}
This works 100% tested, simplest way. The explanation is that blank lines make fgetcsv return a non-empty array with just a null element inside.
if ($result[0] == NULL)
continue;
In short
$csv = array_map('str_getcsv', file($file_path, FILE_SKIP_EMPTY_LINES|FILE_IGNORE_NEW_LINES));
Explanation
file reads the content of the file into an array. The FILE_SKIP_EMPTY_LINES will skip the empty lines in the file.
array_map will apply the function str_getcsv on each element of the array. str_getcsv will parse the string input for fields in
csv format and return an array containing the fields.
Read more about str_getcsv
Read more about file
Read more about array_map

Replace a particular line in a text file using php?

I have a text file that stores lastname, first name, address, state, etc as a string with a | delimiter and each record on a separate line.
I have the part where I need to store each record on a new line and its working fine; however, now I need to be able to go back and update the name or address on a particular line and I can't get it to work.
This how to replace a particular line in a text file using php? helped me here but I am not quite there yet. This overwrites the whole file and I lose the records. Any help is appreciated!
After some edit seems to be working now. I am debugging to see if any errors.
$string= implode('|',$contact);
$reading = fopen('contacts.txt', 'r');
$writing = fopen('contacts.tmp', 'w');
$replaced = false;
while (!feof($reading)) {
$line = fgets($reading);
if(stripos($line, $lname) !== FALSE) {
if(stripos($line, $fname) !== FALSE) {
$line = "$string";
$replaced = true;
}
}
fwrite($writing, "$line");
//fputs($writing, $line);
}
fclose($reading); fclose($writing);
// might as well not overwrite the file if we didn't replace anything
if ($replaced)
{
rename('contacts.tmp', 'contacts.txt');
} else {
unlink('contacts.tmp');
}
It seems that you have a file in csv-format. PHP can handle this with fgetcsv() http://php.net/manual/de/function.fgetcsv.php
if (($handle = fopen("contacts.txt", "r")) !== FALSE) {
$data = fgetcsv($handle, 1000, '|')
/* manipulate $data array here */
}
fclose($handle);
So you get an array that you can manipulate. After this you can save the file with fputcsv http://www.php.net/manual/de/function.fputcsv.php
$fp = fopen('contacts.tmp', 'w');
foreach ($data as $fields) {
fputcsv($fp, $fields);
}
fclose($fp);
Well, after the comment by Asad, there is another simple answer. Just open the file in Append-mode http://de3.php.net/manual/en/function.fopen.php :
$writing = fopen('contacts.tmp', 'a');

How to replace one line in php?

I have test.txt file, like this,
AA=1
BB=2
CC=3
Now I wanna find "BB=" and replace it as BB=5, like this,
AA=1
BB=5
CC=3
How do I do this?
Thanks.
<?php
$file = "data.txt";
$fp = fopen($file, "r");
while(!feof($fp)) {
$data = fgets($fp, 1024);
// You have the data in $data, you can write replace logic
Replace Logic function
$data will store the final value
// Write back the data to the same file
$Handle = fopen($File, 'w');
fwrite($Handle, $data);
echo "$data <br>";
}
fclose($fp);
?>
The above peace of code will give you data from the file and helps you to write the data back to the file.
Assuming that your file is structured like an INI file (i.e. key=value), you could use parse_ini_file and do something like this:
<?php
$filename = 'file.txt';
// Parse the file assuming it's structured as an INI file.
// http://php.net/manual/en/function.parse-ini-file.php
$data = parse_ini_file($filename);
// Array of values to replace.
$replace_with = array(
'BB' => 5
);
// Open the file for writing.
$fh = fopen($filename, 'w');
// Loop through the data.
foreach ( $data as $key => $value )
{
// If a value exists that should replace the current one, use it.
if ( ! empty($replace_with[$key]) )
$value = $replace_with[$key];
// Write to the file.
fwrite($fh, "{$key}={$value}" . PHP_EOL);
}
// Close the file handle.
fclose($fh);
The simplest way (if you are talking about a small file as above), would be something like:
// Read the file in as an array of lines
$fileData = file('test.txt');
$newArray = array();
foreach($fileData as $line) {
// find the line that starts with BB= and change it to BB=5
if (substr($line, 0, 3) == 'BB=')) {
$line = 'BB=5';
}
$newArray[] = $line;
}
// Overwrite test.txt
$fp = fopen('test.txt', 'w');
fwrite($fp, implode("\n",$newArray));
fclose($fp);
(something like that)
You can use Pear package for find & replace text in a file .
For more information read
http://www.codediesel.com/php/search-replace-in-files-using-php/

Categories