how to download php string when button is clicked

Question

I have read most of the SO questions related to this and I understand that I can use following to download a string as a file in PHP:

header('Content-Disposition: attachment; filename="default-filename.txt"');
echo 'string to download';

However my problem is a bit more. I have something like following:

$csvString = "";
foreach($array as $key => $value)
{
  echo "<div> $key has $value</div>";
  $csvString = "$key,$value\n";
}
echo "<button> Click here to download as CSV</button>";

As you might have already guessed, I want $csvString to be downloaded when the button is clicked. Any pointers on how I can get that done.

<a href="download.php?id=whatever">click here</a>

Marc B
– Marc B

2015-06-18 14:09:01 +00:00
Commented Jun 18, 2015 at 14:09 — Marc B
– Marc B, Commented Jun 18, 2015 at 14:09
@MarcB erm....how does that work?

Undefined Variable
– Undefined Variable

2015-06-18 14:10:32 +00:00
Commented Jun 18, 2015 at 14:10 — Undefined Variable
– Undefined Variable, Commented Jun 18, 2015 at 14:10
@UndefinedVariable I think, this tutorial will help you.

jagad89
– jagad89

2015-06-18 18:54:18 +00:00
Commented Jun 18, 2015 at 18:54 — jagad89
– jagad89, Commented Jun 18, 2015 at 18:54

venca · Accepted Answer · 2015-06-18 14:28:13Z

2

Lets say you have csv.php file, then do:

if (isset($_GET['download'] == 1)) {
    header('Content-Disposition: attachment; filename="default-filename.txt"');
    foreach($array as $key => $value) {
        echo "$key,$value\n";
    }
    exit;
}

foreach($array as $key => $value) {
    echo "<div> $key has $value</div>";
}

echo "<a href='csv.php?download=1'><button> Click here to download as CSV</button></a>";

Basically, if you want all the logic in single file, first check if download is requested and if so prepare it. If no download is request just write your html.

answered Jun 18, 2015 at 14:28

venca

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