I have csv data in PHP such as the following (note, it's text with new line characters in it, not a file):
$data = 'A,B,C,D,E,F,G,H
1,1,2014-12-10,5,1,2,0,2
2,7,2014-12-09,9,0,,7,2';
How can I extract a column as an array that excludes the headers? For example, if I wanted to extract the 4th column, it would include 5 and 9.
UPDATE: I have tried
$te = array_column($data,'D');
and I get the error: Warning: array_column() expects parameter 1 to be array,
You can use str_getcsv() to read each row as an array (discarding the first to skip headers). Then just keep the relevant column, e.g.:
$lines = preg_split("/(?:\r?\n|\r\n?)/", $data); // Split lines
array_shift($lines); // Discard header
$result = array();
foreach ($lines as $csv) {
$row = str_getcsv($csv);
$result[] = $row[3];
}
var_dump($result);
As per cHao suggestion in the comment below, if you need a more robust support of generic CSV data, you can dump the string to a virtual file and use fgetcsv() instead (which already handles parsing of multiple lines of input correctly):
$fp = fopen('php://temp', 'r+');
fputs($fp, $data);
fseek($fp, 0);
$result = array();
fgetcsv($fp);
while (false != ($row = fgetcsv($fp))) {
$result[] = $row[3];
}
fclose($fp);
var_dump($result);
If this a comma delimited string, you could use str_getcsv() in this case:
// load the string and explode, then apply str_getcsv
$data = array_map('str_getcsv', explode("\n", $request->getResponseBody()));
array_shift($data); // remove the header
$fourth_column = array();
foreach($data as $line) {
if(!empty($line[3])) {
$fourth_column[] = $line[3]; // indices start at zero
}
}
Related
i am having difficulties with extracting specific text from a text file. I have tried many different ways like using fopen or file to open the file but this wont allow me to use any of the string functions. So i have decided to use file_get_contents and extract the text i want with the string methods as follows:
<?php
$data = [];
$file =
file_get_contents("data.txt", 0, NULL, 148);
list($id, $data_names) = preg_split('[:]', $file);
array_push($names, $data_names);
echo $emails[0];
?>
I used preg_split to split the text i want at a specific character (:) and i put the data in an array. Which worked for the first line but i don't know how to go about doing it for the rest of the lines, i've tried a while loop but that just ends up in an infinite loop.
data.txt formatted like this:
1:hannah.Smith
2:Bob.jones
3:harry.white
....
Any suggestions on how to do this or a better approach would be greatly appreciated.
There is a function for that. This isn't CSV but change the delimiter. To just get the names:
$handle = fopen("data.txt", "r"));
while(($line = fgetcsv($handle, 0, ":")) !== FALSE) {
$names[] = $line[1];
}
To index the names by the ids:
while(($line = fgetcsv($handle, 0, ":")) !== FALSE) {
$names[$line[0]] = $line[1];
}
To get the ids and names in a multidimensional array, use:
while(($names[] = fgetcsv($handle, 0, ":")) !== FALSE) {}
Well you are not assigning the return value of file_get_contents to a variable. So the contents of the file are not being used.
You can use the file function. It reads the contents of a file to an array. Each element of the array is a line in the file. You can then loop over the array and parse each line. For example:
$names = array();
$file = file_get_contents("data.txt");
for ($count = 0; $count < count($file); $count++) {
list($id, $name) = $file[$count];
$names[] = $name;
}
/** print the contents of the names array */
print_R($names);
I would like to be able to edit a config file for a server application using php. The config file is as follows:
include=sc_serv_public.conf
streamid_2=2
streampath_2=/relay
streamrelayurl_2=http://<full_url_of_relay_including_port>
;allowrelay=0
;allowpublicrelay=0
I would like to edit the line:
streamrelayurl_2=http://<full_url_of_relay_including_port>
and then save the file.
I am currently using:
$data = file_get_contents("sc_serv.conf"); //read the file
$convert = explode("\n", $data); //create array separate by new line
to open the file, but now I dont know how to edit it.
As an alternative, you could just use file() instead. This just loads it up into array form, no need to explode. Then after that, you just loop the elements, if the desired needle is found, overwrite it, the write the file again:
$data = file('sc_serv.conf', FILE_IGNORE_NEW_LINES); // load file into an array
$find = 'streamrelayurl_2='; // needle
$new_value = 'http://www.whateverurl.com'; // new value
foreach($data as &$line) {
if(strpos($line, 'streamrelayurl_2=') !== false) { // if found
$line = $find . $new_value; // overwrite
break; // stop, no need to go further
}
}
file_put_contents('sc_serv.conf', implode("\n", $data)); // compound into string again and write
You can use file() to read the file content to an array, then you can iterate trough the array with foreach() searching with the strstr() function the line that have your URL (in this case is in the var $id_change) and change the value. Then as you found what you needed, you end the foreach() with break. And make your string to save in the file with implode() and save the string to the config file with file_put_content().
See the code:
<?php
$new_url = 'http://www.google.com';
$id_change = 'streamrelayurl_2';
$file = "sc_serv.conf";
$data = file($file); //read the file
foreach($data as $key => $value) {
if(strstr($value, $id_change)) {
$info = $id_change . '=' . $new_url . "\n";
$data[$key] = $info;
break;
}
}
$data = implode("", $data);
file_put_contents($file, $data);
?>
Output:
include=sc_serv_public.conf
streamid_2=2
streampath_2=/relay
streamrelayurl_2=http://www.google.com
;allowrelay=0
;allowpublicrelay=0
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);
I have a file codes.txt with records like this
USA 0233
JPN 6789
TUN 8990
CDN 2345
I want to read these content of the file to an associative array like this.
$codes["USA"] = 0233;
$codes["JPN"] = 6789;
$codes["TUN"] = 8990;
$codes["CDN"] = 2345;
this is the code that opens the file for writing. I need help in the array part. thks
$myFile = "codes.txt";
$fh = fopen($myFile, 'r');
$theData = fread($fh, filesize($myFile));
fclose($fh)
It's pretty straight forward. First read the file line-by-line (e.g. see the file function which does this already). Then parse each line by splitting it at the first space (see explode), use the first part as key and the second part as value:
$array = array();
foreach (file($myFile) as $line)
{
list($key, $value) = explode(' ', $line, 2) + array(NULL, NULL);
if ($value !== NULL)
{
$array[$key] = $value;
}
}
If your parser needs to be more specific, change it according to your needs. There are a lot of string functions with PHP that can be used for more differentiated parsing, like sscanf or regular expressions.
Another common method is to extend from SplFileObject, it allows to encapsulate the data-aquisition inside an iterator so you can better differentiate between the place where the data is used and where it is taken from. You can find an example in another answer:
PHP - Process CSV Into Array With Column Headings For Key
$myFile = "codes.txt";
$fh = fopen($myFile, 'r');
$theData = fread($fh, filesize($myFile));
$assoc_array = array();
$my_array = explode("\n", $theData);
foreach($my_array as $line)
{
$tmp = explode(" ", $line);
$assoc_array[$tmp[0]] = $tmp[1];
}
fclose($fh);
// well the op wants the results to be in $codes
$codes = $assoc_array;
There is an optimal way of doing this than any of these answers. You can use file_get_contents and array_walk functions to cut the things very short.
$allCases = explode("\r\n", file_get_contents("myfile.txt"));
$myList = array();
array_walk($allCases, "step", $myList);
function step($val, $key, &$arr) {
$aCase = explode(" ", $val);
$arr[$aCase[0]] = $aCase[1];
}
This way you don't need a for loop or a file handler.
Beware of the delimiter "\r\n" since this could be platform dependent in this case.
I have a CSV file and we know excel does its thing with commas in a field by enclosing them in double quotation marks for instance i have a file
Product Name,Product Code
Product 1,AAA
"Prod,A,B",BBB
How can I use RegExp to replace the quotation marks with "." instead but only within quotation marks so i get
Product Name,Product Code
Product 1,AAA
Prod.A.B,BBB
as output
CSV handling functions (fgetcsv(), fputcsv()) are much better for this - they will handle edge cases and will likely be far more reliable than any regex you can come up with.
// Open the file
$fp = fopen($pathToCsvFile, 'r+');
// Create an array of modified data
$tmp = array();
while (($row = fgetcsv($fp, 8192)) !== FALSE) {
foreach ($row as &$field) $field = str_replace(',', '.', $field);
$tmp[] = $row;
}
// Truncate the file and put the pointer at the beginning
ftruncate($fp, 0);
rewind($fp);
// Write the modified data back and close the file
foreach ($tmp as $row) {
fputcsv($fp, $row);
}
fclose($fp);
EDIT Following your comment about not wanting to read from/write to disk, you can do this:
// Lets say the raw CSV data is held in this variable as a string
$rawCsvData = 'Product Name,Product Code
Product 1,AAA
"Prod,A,B",BBB';
// Open a virtual file pointer to memory and fill it with your data
$fp = fopen('php://memory', 'w+');
fwrite($fp, $rawCsvData);
// Start from the beginning of the pointer
rewind($fp);
// ... INSERT CODE FROM ABOVE HERE (minus the fopen()/fclose())
$modifiedCsvData = stream_get_contents($fp);
fclose($fp);
This will do multiple replaces, and remove the quotes.
<?php
$data = 'Product Name,Product Code
Product 1,AAA
"Prod,A,B",BBB';
$rgx = '/"(.+?)"/';
preg_match_all($rgx, $data, $matches);
$x = 0; $max = count($matches[0]);
while($x < $max){
$replace = str_replace(",", ".", $matches[1][$x]);
$data = str_replace($matches[0][$x], $replace, $data);
$x++;
}
echo $data;
?>