CODEWITHSUNDEEP
phpstringbase64
gordyr
gordyr

Reputation: 6276

How can I strip the data:image part from a base64 string of any image type in PHP

I am currently doing the following to decode base64 images in PHP:

   $img = str_replace('data:image/jpeg;base64,', '', $s['image']);
   $img = str_replace('data:image/png;base64,', '', $s['image']);
   $img = str_replace('data:image/gif;base64,', '', $s['image']);
   $img = str_replace('data:image/bmp;base64,', '', $s['image']);
   $img = str_replace(' ', '+', $img);
   $data = base64_decode($img);

As you can see above we are accepting the four most standard image types (jpeg, png, gif, bmp);

However, some of these images are very large and scanning through each one 4-5 times with str_replace seems a dreadful waste and terribly inefficient.

Is there a way I could reliably strip the data:image part of a base64 image string in a single pass? Perhaps by detecting the first comma in the string?

My apologies if this is a simple problem, PHP is not my forte. Thanks in advance.

Upvotes: 12

Views: 25589

Answers (5)

Ankit Kumar Rajpoot
Ankit Kumar Rajpoot

Reputation: 5600

You can Regular expression for remove image or pdf data formate.

data.replace(/^data:application\/[a-z]+;base64,/, "")

Upvotes: 0

Severin
Severin

Reputation: 183

I generete a image with javascript/kendo and send this by ajax to the server.

preg_replace('#^data:image/[^;]+;base64,#', '', $s['image']);

it does not work in this case. in my case this code works better:

$contentType  = mime_content_type($s['image']);
$img = preg_replace('#^data:image/(.*?);base64,#i', '$2', $s['image']);

Upvotes: 0

sebob
sebob

Reputation: 525

Function file_get_contents remove header and use base64_decode function, so you get clear content image.

Try this code:

$img = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAA0gA...';
$imageContent = file_get_contents($img);

Upvotes: 26

TFennis
TFennis

Reputation: 1423

You would have to test it but I think this solution should be slightly faster than Mihai Iorga's

$offset = str_pos($s['image'], ',');
$data = base64_decode(substr($s['image'], $offset));

Upvotes: 0

Carlos Campderrós
Carlos Campderrós

Reputation: 22982

You can use a regular expression:

$img = preg_replace('#data:image/[^;]+;base64,#', '', $s['image']);

if the text you are replacing is the first text in the image, adding ^ at the beginning of the regexp will make it much faster, because it won't analyze the entire image, just the first few characters:

$img = preg_replace('#^data:image/[^;]+;base64,#', '', $s['image']);

Upvotes: 35

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