PHP, Mathematical Functions


<?php



string base64_encode ( string $string )





where,



$string = The data to be encoded



?>

$string

The data to be encoded to base64.

BASE64 alphabet

base64_encode Is designed to allow binary data transfer in 8-bit layers to be handled in layers that are not truly 8-bit.

Base64 alphabet
0	A	16	Q	32	g	48	w
1	B	17	R	33	h	49	x
2	C	18	S	34	i	50	y
3	D	19	T	35	j	51	z
4	E	20	U	36	k	52	0
5	F	21	V	37	l	53	1
6	G	22	W	38	m	54	2
7	H	23	X	39	n	55	3
8	I	24	Y	40	o	56	4
9	J	25	Z	41	p	57	5
10	K	26	a	42	q	58	6
11	L	27	b	43	r	59	7
12	M	28	c	44	s	60	8
13	N	29	d	45	t	61	9
14	O	30	e	46	u	62	+
15	P	31	f	47	v	63	/
						64	=
ed48

This encoding function is designed to make binary data survive transport through transport layers that are not 8-bit clean, such as mail bodies.

The Base64-encoded data takes about 33% more space than the original data.

EXERCISE


<?php



$str_it_01 = '... è bene trovato!';



$strbase64_it_01 = base64_encode($str_it_01);



echo $strbase64_it_01;



?>

RESULT

Li4uIMOoIGJlbmUgdHJvdmF0byE=

EXERCISE


<?php



$img_src = 'starp.png';



// Choose any image file...

// if you prefer, use the star image 

// below as a reference



$img_bin = fread(fopen($img_src, 'r'),

 filesize($img_src));



$img_str = base64_encode($img_bin);



// Save de image file as STRING

// encoded by base64_encode



$fs = file_put_contents('starpx.dat', $img_str);



if($fs == true)

{

    echo "File saved as expected!<br>";

}

else

{

    echo "File NOT saved as expected!<br";

}



?>