Base64 Encode Decode in Php (original) (raw)
Published on 30 March 2025 (Updated: 30 March 2025)
Welcome to the Base64 Encode Decode in Php page! Here, you'll find the source code for this program as well as a description of how the program works.
Current Solution
<?php
function usage()
{
exit("Usage: please provide a mode and a string to encode/decode");
}
// Cannot use the library function directly because it doesn't check if the
// length of the input string is a multiple of 4. The value of false is
// returned if the input string is invalid. Otherwise, the Base64 decoded
// string is returned
function base64_validate_and_decode($str)
{
// Use the library function if length of input string is a multiple of 4.
// Otherwise, just return false
$result = false;
if (strlen($str) % 4 == 0) {
<span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>r</mi><mi>e</mi><mi>s</mi><mi>u</mi><mi>l</mi><mi>t</mi><mo>=</mo><mi>b</mi><mi>a</mi><mi>s</mi><mi>e</mi><mn>6</mn><msub><mn>4</mn><mi>d</mi></msub><mi>e</mi><mi>c</mi><mi>o</mi><mi>d</mi><mi>e</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">result = base64_decode(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal">res</span><span class="mord mathnormal">u</span><span class="mord mathnormal">lt</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">ba</span><span class="mord mathnormal">se</span><span class="mord">6</span><span class="mord"><span class="mord">4</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.3361em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">d</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal">eco</span><span class="mord mathnormal">d</span><span class="mord mathnormal">e</span><span class="mopen">(</span></span></span></span>str, true);
}
return $result;
}
// Exit if arguments are invalid
if (count($argv) < 3 || strlen($argv[2]) < 1)
{
usage();
}
<span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>m</mi><mi>o</mi><mi>d</mi><mi>e</mi><mo>=</mo></mrow><annotation encoding="application/x-tex">mode = </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal">m</span><span class="mord mathnormal">o</span><span class="mord mathnormal">d</span><span class="mord mathnormal">e</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span></span></span></span>argv[1]; <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>s</mi><mi>t</mi><mi>r</mi><mo>=</mo></mrow><annotation encoding="application/x-tex">str = </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6151em;"></span><span class="mord mathnormal">s</span><span class="mord mathnormal">t</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span></span></span></span>argv[2];
switch ($mode) {
case "encode":
<span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>r</mi><mi>e</mi><mi>s</mi><mi>u</mi><mi>l</mi><mi>t</mi><mo>=</mo><mi>b</mi><mi>a</mi><mi>s</mi><mi>e</mi><mn>6</mn><msub><mn>4</mn><mi>e</mi></msub><mi>n</mi><mi>c</mi><mi>o</mi><mi>d</mi><mi>e</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">result = base64_encode(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal">res</span><span class="mord mathnormal">u</span><span class="mord mathnormal">lt</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">ba</span><span class="mord mathnormal">se</span><span class="mord">6</span><span class="mord"><span class="mord">4</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">e</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal">n</span><span class="mord mathnormal">co</span><span class="mord mathnormal">d</span><span class="mord mathnormal">e</span><span class="mopen">(</span></span></span></span>str);
break;
case "decode":
<span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>r</mi><mi>e</mi><mi>s</mi><mi>u</mi><mi>l</mi><mi>t</mi><mo>=</mo><mi>b</mi><mi>a</mi><mi>s</mi><mi>e</mi><mn>6</mn><msub><mn>4</mn><mi>v</mi></msub><mi>a</mi><mi>l</mi><mi>i</mi><mi>d</mi><mi>a</mi><mi>t</mi><msub><mi>e</mi><mi>a</mi></msub><mi>n</mi><msub><mi>d</mi><mi>d</mi></msub><mi>e</mi><mi>c</mi><mi>o</mi><mi>d</mi><mi>e</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">result = base64_validate_and_decode(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal">res</span><span class="mord mathnormal">u</span><span class="mord mathnormal">lt</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">ba</span><span class="mord mathnormal">se</span><span class="mord">6</span><span class="mord"><span class="mord">4</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight" style="margin-right:0.03588em;">v</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal">a</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">i</span><span class="mord mathnormal">d</span><span class="mord mathnormal">a</span><span class="mord mathnormal">t</span><span class="mord"><span class="mord mathnormal">e</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">a</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal">n</span><span class="mord"><span class="mord mathnormal">d</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.3361em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">d</span></span></span></span><span class="vlist-s"></span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal">eco</span><span class="mord mathnormal">d</span><span class="mord mathnormal">e</span><span class="mopen">(</span></span></span></span>str);
if ($result === false) {
usage();
}
break;
default:
usage();
}
echo $result;
Base64 Encode Decode in Php was written by:
- rzuckerm
If you see anything you'd like to change or update, please consider contributing.
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