convert string to base convert 62 [closed] - php

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I was trying to make a URL shortener. Where the give url needs to convert to base 62
I have converted the URL in following but it convert it to random number like 0 or 1sromm8 or 2gs0ygibs
base_convert($shortener->full_url, 10, 36);
How do i convert it to base62 so that every time 5 characters unique name generated.

Answer 1

I use this customized function to convert String to base62 String
function b62e($str) {
if(mb_check_encoding($str, 'ASCII')) {
$out = '';
$len = strlen($str);
for($i=0; $i<$len; $i+=8) {
$chunk = substr($str, $i, 8);
$outlen = ceil( strlen($chunk)*8/6 );// 8bit/char in, 6bits/char out, round up
$hex = bin2hex($chunk);// gmp won't convert from binary, so go via hex
$raw = gmp_strval(gmp_init(ltrim($hex, '0'), 16), 62);// gmp doesn't like leading 0s
$out .= str_pad($raw, $outlen, '0', STR_PAD_LEFT);
}
return $out;
}
return false;// unicode chars not supported
}
function b62d($str) {
if(mb_check_encoding($str, 'ASCII')) {
$out = '';
$len = strlen($str);
for ($i=0; $i<$len; $i+=11) {
$chunk = substr($str, $i, 11);
$outlen = floor( strlen($chunk)*6/8 );// 6bit/char in, 8bits/char out, round down
$raw = gmp_strval(gmp_init(ltrim($chunk, '0'), 62), 16);// gmp doesn't like leading 0s
$pad = str_pad($raw, $outlen * 2, '0', STR_PAD_LEFT);// double output length as as we're going via hex (4bits/char)
$out .= pack('H*', $pad);// same as hex2bin
}
return $out;
}
return false;// unicode chars not supported
}
Demo
All credits go to Marcus Bointon, Thanks to Flash Thunder answer
May you also use obfuscator to prevent users decode variables
function obf62rep($which){// make array before translate string
$rep = [];
$str1 = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$str2 = 'GHIJKLMNqrstuvwx01OPQRSTUVWXYZhijklmnop23456789abcdefgyzABCDEF';
if($which){// while obfuscate from-->to
$fr = str_split($str1);
$to = $str2;
}else{// while de-obfuscate to-->from
$fr = str_split($str2);
$to = $str1;
}
foreach($fr as $k=>$v){// make array tr-->to
$rep[$v] = $to[$k];
}
return $rep;
}
function obf62e($str){return strtr($str,obf62rep(1));}// translate string = obf
function obf62d($str){return strtr($str,obf62rep(0));}// translate back = deobf
Demo
And then make it more simple to use, like
function ob62e($str){return obf62e(b62e($str));}// encode base62 + obfuscate
function ob62d($str){return b62d(obf62d($str));}// decode base62 + deobfuscate
Sample usage
echo ob62e('test');
$name = ob62e('jhon');