How to check validity of base64 image in php?

Question

Anyone have any idea how to know the base64 image validity?

This is my code for more explain:

$pic = `data:image/jpeg;base64,/9j/4AAQSkZJ....`
if($pic is base64 image){
    echo "$pic is base64 image";
} else {
    echo "Not base64 image";
}

Thanks in advance guys.

First base 64 decode, then load with an image library that understands png and jpeg. — erik258, Nov 12 '21 at 01:09

score 0 · Answer 1 · answered Nov 12 '21 at 00:54

0

There is no exact function for that but you can do this.

if ( base64_encode(base64_decode($pic, true)) === $pic){
    echo "$pic is base64 image";
} else {
    echo "Not base64 image";
}

answered Nov 12 '21 at 00:54

Dula

1

I tried this code before but there is no output at all! – Hazem El-behairy Nov 12 '21 at 00:57
Any errors or warnings? – Dula Nov 12 '21 at 00:58
Now there is and output comes with: `Not base64 image` – Hazem El-behairy Nov 12 '21 at 00:59
I just edited the code to `if (base64_encode(base64_decode($pic, true)) !== false)` but it checked only for images if it base64 when I try to test for example `x.zip` it comes with no outputs – Hazem El-behairy Nov 12 '21 at 01:04
That is strange. TBH I have never tried to encode a zip file using Base64. – Dula Nov 12 '21 at 01:10
This is just for example. Actually I want to check if the uploaded base64 is already image or not in `` – Hazem El-behairy Nov 12 '21 at 01:18
Maybe this can give you some idea. https://stackoverflow.com/questions/6061505/detecting-image-type-from-base64-string-in-php – Dula Nov 12 '21 at 01:25

1 Answers1