I'm very new to PHP. I have looked around at other questions but none of them seem to provide a solution, so hopefully someone can help!
I have a csv file, but wish to pick out individual fields instead of displaying a whole column.
Is this possible with php?
My code so far (below) picks out specific columns which is not quite what I want to do. If it could pick out specific rows, that would be better than what it's currently showing, but ideally I'd be able to pick specific fields out.
<table>
<?php
$handle = fopen("test.csv", "r");
while (!feof($handle) ) {
$line_of_text = fgetcsv($handle, 1024, ",");
print "<tr><td>" . $line_of_text[0] . "</td><td>" . $line_of_text[5] . "</td></tr>";
}
fclose($handle);
?>
</table>
Hopefully that makes sense!
fgetcsv() only reads the file line by line, so if you want to skip to a particular line, you'd have to put that in yourself:
$desired_line = 17;
$current_line = 0;
while($line = fgetcsv($handle)) {
$current_line++;
if ($current_line < $desired_line) {
continue; // keep reading more lines until we reach 17.
}
print blah blah blah;
}
Related
I want to count number of files in a php file. I am using CodeIgniter framework.
Currently I have tried this below
$file='contractor.php';
$mypath= 'application/controller/'.$file;
$linecount = 0;
$handle = fopen($mypath, "r");
while(!feof($handle)){
$line = fgets($handle);
$linecount++;
}
fclose($handle);
echo $linecount;
Currently after executing the file in a function it keeps loading. i want to find number of lines in the file.like
output: 202
Try this one hope this will work for you :)
$file = 'getinvoice';
no_of_lines = count(file($file));
echo "number of lines $file";
Your code looks good.
I suppose that the function keeps loading because the file is too big.
Check this answer for an efficient approach to the problem:
Efficiently counting the number of lines of a text file. (200mb+)
$file = basename($_SERVER['PHP_SELF']);
$no_of_lines = count(file($file));
echo "There are $no_of_lines lines in $file"."\n";
If your files are quite small, you could try something like this.
$lines=file($filename);
$count=count($lines);
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!
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));
I have a CSV that is downloaded from the wholesaler everynight with updated prices.
What I need to do is edit the price column (2nd column) and multiply the current value by 1.3 (30%).
My code to read the provided CSV and take just the columns I need is below, however I can't seem to figure out how to edit the price column.
<?php
// open the csv file in write mode
$fp = fopen('var/import/tb_prices.csv', 'w');
// read csv file
if (($handle = fopen("var/import/Cbl_4036_2408.csv", "r")) !== FALSE) {
$targetColumns = array(1, 2, 3); // get data from the 1st, 4th and 15th column
while (($data = fgetcsv($handle, 1000, ",")) !== FALSE) {
$targetData = array(); // array that hold target data
foreach($targetColumns as $column){ // loop throught the targeted columns array
if($column[2]){
$data[$column] = $data[0] * 1.3;
}
$targetData[] = $data[$column]; // get the data from the column
}
# Populate the multidimensional array.
$csvarray[$nn] = $targetData; // add target data to csvarray
// write csv file
fputcsv($fp, $targetData);
}
fclose($handle);
fclose($fp);
echo "CSV File Written Successfully!";
}
?>
Could somebody point me in the right direction please, explaining how you've worked out the function too so I can learn at the same time.
You are multiplying your price column always as - $data[0] * 1.3.
It may be wrong here.
Other views:
If you are doing it once in a lifetime of this data(csv) handling, try to solve it using mysql itself only. Create the table similar to the database, import the .csv data into that mysql table. And then, SQL operate as you want.
No loops; no coding, no file read/write, and precise control over what you want to do with UPDATE. You just need to be aware of the delimiters (line separators eg. \r\n, column separators (eg. comma or tab or semicolon) and data encoding in double/single-quotes or not)
Once you modify your data, you can export it back to csv again.
If you want to handle the .csv file itself, open it in one connection (read only mode), and write to another file - saving the original data.
you say that the column that contains the price is the second but then use that index with zero. anyway the whole thing can be easier
$handle = fopen("test.csv", "r");
if ( $handle !== FALSE) {
$out = "";
while (($data = fgetcsv($handle, 1000, ";")) !== FALSE) {
$data[1] = ((float)$data[1] * 1.3);
$out .= implode(";",$data) . "\n";
}
fclose($handle);
file_put_contents("test2.csv", $out);
}
this code open a csv file with comma as separator.
than read every line and for every line it's multiplies the second coloumn (index 1) for 1.3
this line
$out .= implode(";",$data) . "\n";
generate a line for new csb file. see implode on the officile documentation ...
after I close the connection to the file. and 'useless to have a connection with two files when you can do the writing of the second file in one fell swoop. the thing is true for small files
I am trying to use a function much like this.....
$file = fopen("/tmp/$importedFile.csv","r");
while ($line = fgetcsv($file))
{
$csv_data[] = $line;
}
fclose($file);
...to load CSV values. This is gravy but now I wish to select individual columns by their array number. I believe I want to select it with something like this, but cannot find any clarity.
$csv_data[2] = $line;
This however just shows second (third) row of data rather than column.
Regards
Do you need the whole file in memory or will you be processing the lines individually?
Processing individually:
$line is already an array. If you want the 3rd column, use $line[2]
Processing after reading the whole file:
$csv_data[$lineNo][$columnNo]
$inputfiledelimiter = ",";
if (($handle = fopen($PathOfCsvFile, "r")) !== FALSE)
{
while (($data = fgetcsv($handle, 0, $inputfiledelimiter)) !== FALSE)
{
//get data from $data
}
}
Well, your CSV file is now split up in lines, that is all.
No concept of columns yet in that structure.
So you need to split the lines into columns.
Or, much better, let PHP do that for you: Have a look at fgetcsv() and the associated functions:
http://nl.php.net/manual/en/function.fgetcsv.php
I think my method is lame, but I cannot think of a better way to do this.
I use Ultraedit text editor to hold all the stuff I cull out of Stackoverflow for PHP and MySQL in a text file. This is my strict format for each new entry:
#################################################
TITLE: THIS IS MY TITLE (ALL IN CAPS, FOLLOWD BY A DOTTED LINE)
-------------------------------------------------
...probably a question first (if necessary), then another shorter dotted line
-------------------
...answer(s)...
#################################################
So, here is an actual entry:
#################################################
TITLE: READING FIRST 5 FIELDS OF CSV FILE INTO PHP
-------------------------------------------------
(...with fgetcsv...)
$row = 1;
if (($handle = fopen("test.csv", "r")) !== FALSE) {
while (($data = fgetcsv($handle, 1000, ",")) !== FALSE) {
$num = count($data);
echo "<p> $num fields in line $row: <br /></p>\n";
// iterate over each column here
for ($c=0; $c < $num; $c++) {
// handle column data here
echo $data[$c] . "<br />\n";
// exit the loop after 3rd column parsed
if ($c == 2) break;
}
++$row;
}
fclose($handle);
-----------------
(...without fgetcsv...)
$lines = file('data.csv');
$linecount = count($lines);
for ($i = 1; $i < $linecount; $i++){
$fields = explode(',', $lines[$i]);
$sno = $fields[0];
$name = $fields[1];
$ph = $fields[2];
$add = $fields[3];
}http://stackoverflow.com/users/login?returnurl=%2fquestions%2fask
#################################################
I can get a list of titles by searching for "TITLE: *", etc. My text file now contains about 15,000 lines. Is there a better way to do this? I have asked StackOverflow before about snippet software, but after a thorough search, there is really nothing out there that fits my needs.
In a way, I'm surprised that there is not a PHP/MySQL application for doing this (collecting snippets). I can't do it because I don't have the knowledge or talent. The snippet collector in my IDE will not suffice.
Thanks!
why not build yourself a little application with a small sql backend (say SQLCE or SQLITE)?
You could build it so that you have the following tables:
Title
Code Snippet
Original Question Url
and then you can relate in the TAGS of the question via another Table to allow better searching/cross referencing.
I have used InfoSelect software for years for this purpose, and have many megabytes of searchable notes and code snippets. It isn't exclusively for code snippets. It's the software equivalent of keeping notes on index cards and being able to arrange them in hierarchies, or do a search on them.
Another similar tool is OneNote which is part of Microsoft Office.
If you remove the condition that your tool should be specifically for tracking code snippets, you may be able to broaden your choices.