Save Image Coming from Upload in a PHP variable

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How to capture an image that comes from an HTML file type input, in a PHP variable? For example with a text input works this way: 

$vnome = ($_POST["f_nome"]);
echo $vnome;


<input type="text" name="f_nome">

How to do the same with an image? It is possible to save image in a PHP variable?

php

1 answer

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The server along with PHP before running your script has already done the "parse" of PAYLOAD and saved the image in the folder ./tmp configured by php.ini in upload_tmp_dir, then you can upload normally and use file_get_contents, a basic example would be:

<form action="upload.php" method="POST" enctype="multipart/form-data">
<input type="file" name="arquivo" multiple>
<button type="submit">Upload</button>
</form>

And php would be:

<?php

if (empty($_FILES['arquivo']['tmp_name'])) {
     die('Erro no upload');
}

//Pega os dados do upload
$dados_da_imagem = file_get_contents($_FILES['arquivo']['tmp_name']);

If you want to display on screen you have to use data URI Scheme, something like:

$dados_da_imagem = file_get_contents($_FILES['arquivo']['tmp_name']);

echo '<img src="data:image/gif;base64,', base64_encode($dados_da_imagem),'">';

Now if your intention is to display an image preview before completing the upload, I recommend doing so on front-end, before even sending the POST, example of Javascript tools:

  • This way it is possible to call the "$dados_do_upload" to show the image?

  • @Henriquebretone yes, it is possible, you did not see the example echo '<img src="data:image/gif;base64,', base64_encode($dados_da_imagem),'">';?

  • 1

    @Henriquebretone Now if your intention is to display an image preview before completing the upload (type user wants to check if it is the right photo), I recommend to do it on the front end, even before sending the POST, example of Javascript tools: http://www.dropzonejs.com/ or http://opoloo.github.io/jquery_upload_preview/

  • Not the intention was not to make a thumbnail preview, the idea was to take the image in PHP and play it in an HTML template to generate a PDF that appears-if the image, I am doing this with text quietly the problem is the need to show the image that the user uploaded in the PDF file.

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