PHP summary of converting dataurl into image image method

PHP method to convert dataurl into image image

The image generated using canvas uses dataurl. PHP cannot directly save it to the local computer through the file_put_contents method, so it needs to be transcoded.

The image dataurl is as follows

$imgstr = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==';

Method 1:

Extract the data required for dataurl storage through regular expressions, and then display it directly on the page

if (!preg_match('/data:([^;]*);base64,(.*)/', $imgstr, $matches)) {
  die("error");
}
  
$content = base64_decode($matches[2]);
header('Content-Type: '.$matches[1]);
header('Content-Length: '.strlen($content));
  
echo $content;
die;

Method 2:

If you just want to save the image locally, you can use substr and strpos method

$imgdata = substr($imgstr,strpos($imgstr,",") + 1);
$decodedData = base64_decode($imgdata);
file_put_contents('11.png',$decodedData );

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