Convert image to byte with php

Question

I have to send a picture to a webservice. The web service should receive the image as bytes (mayby bytearray) - not as a string... How do I convert the images to "byte" or bytearray?

I have tried this (without succes):

$image1 = file_get_contents("LINK TO IMAGE");
$image1BinaryData = "".base64_encode($image1)."";

Any help will be appreciated...

Reading it with file_get_contents should return an array of bytes, no? Or does it specifically return a string? If it does, use fopen, fread, and fclose — Cole Tobin, May 21 '12 at 14:38
read this http://stackoverflow.com/questions/885597/string-to-byte-array-in-php — Mona Abdelmajeed, May 21 '12 at 14:58

score 9 · Accepted Answer · answered May 21 '12 at 14:41

9

Have you tried to directly read the image as binary data?

<?php
$filename = "image.png";
$file = fopen($filename, "rb");
$contents = fread($file, filesize($filename));
fclose($file);
?>

answered May 21 '12 at 14:41

sucotronic

1,504
9
20

2

this is what file_get_contents() does. – goat May 21 '12 at 15:01
I'm new, so please be patient :) If I use this exampel, what variabel hold the bytes? – fletcher May 21 '12 at 17:37
1

This solution works: `$handle = fopen("LINK TO IMAGE", "rb"); $contents = stream_get_contents($handle); fclose($handle);` – fletcher May 22 '12 at 08:28

score 3 · Answer 2 · answered Jul 12 '12 at 12:07

3

This is the actual byte array equivalent to what is generated in C# and Java.

$data = file_get_contents("test.jpg");

$array = array(); 
foreach(str_split($data) as $char){ 
    array_push($array, ord($char)); 
}
var_dump(implode(' ', $array));

answered Jul 12 '12 at 12:07

Arvind Bhardwaj

5,231
5
35
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for better performance use $array[] instead of array_push – Dr. House Aug 25 '21 at 19:46

score 0 · Answer 3 · answered May 21 '12 at 14:38

0

a php string is binary, so it's already in bytes.

get rid of base64_encode() and use urlencode() or rawurlencode()

answered May 21 '12 at 14:38

goat

31,486
7
73
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Like this? $image1 = file_get_contents("test.jpg"); $image1BinaryData = urlencode($image1); – fletcher May 21 '12 at 17:47
probably. depends how you send it to the webservice. You may not need urlencode() at all. – goat May 21 '12 at 17:49

Convert image to byte with php

3 Answers3