select some csv values to export in html table with php
Question
I've copied this php:
<?Php
echo "<html><body><table border=1>";
$f = fopen("datos.csv", "r");
$fr = fread($f, filesize("datos.csv"));
fclose($f);
$lines = array();
$lines = explode("\r\n",$fr); // IMPORTANT the delimiter here just the "new line" \r\n, use what u need instead of...
for($i=0;$i<count($lines);$i++) {
echo "<tr>";
$cells = array();
$cells = explode(",",$lines[$i]); // use the cell/row delimiter what u need!
for($k=0;$k<count($cells);$k++) {
echo "<td>".$cells[$k]."</td>";
}
// for k end
echo "</tr>";
}
// for i end
echo "</table></body></html>";
?>
This code generates the html table. I have a csv with one column with diferent values separated with comma, and I want only some values. The question is the loop with the variable $k to catch only value2, value4, value7 ,... I appreciate some help, I'm learning php but I start in advanced mode :-( and I search this site but don't find it.
1 answers
solution1
1 2020-09-02 17:01:06
Its always dangerous to read a whole file into memory, eventually you will find a file that is large enough to blow the script up because it is Too Large to read into memory.
Use fgetcsv() instead in this situation. This reads one line at a time from your csv file, into an array, all you then have to do is pick the occurances (columns) you actually want to process.
if (($handle = fopen("datos.csv", "r")) !== FALSE) {
while (($data = fgetcsv($handle, 2000, ",")) !== FALSE) {
// pick the columns you are interested in
// remember arrays start at index 0
echo sprintf('The bits I am interested in %s, %s, %s<br>',
$data[2], $data[4], $data[7]);
}
fclose($handle);
}
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