Detailed explanation of php base64 encoding and decoding examples-PHP Tutorial-php.cn

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php base64 encoding and decoding detailed explanation

1. Custom rule encoding and decoding

Example

public function test_changinttoStr () { $intvalue1 = 1232344234; $intStr = ''; $str = "Y 9 L F k g y 5 R o v i x I 1 a O f 8 U h d s 3 r 4 D M p l Q Z J X P q e b E 0 W S j B n 7 w V z m N 2 G c 6 T H C A K u t"; $seq = explode(" ", $str); $intvalue = $intvalue1; while ($intvalue >= 62) { # code... $intStr = ($seq[$intvalue % 62]).$intStr ; $intvalue = (int)($intvalue / 62); } $intStr = ($seq[$intvalue]).$intStr; echo($intStr); $keySeq= array_flip($seq); $length = strlen($intStr); $value = 0; for ($i = $length -1; $i >=0; $i--) { $t = $keySeq[$intStr[$i]]; $s = ($length - $i) - 1; $m = (pow(62, $s) * $t); $value += $m; } echo $value; }

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2. Use system functions to complete base64-bit encoding and decoding

Example code:

public function testArray(){ // $str['a'] = 'sdfsdf'; // $str['d'] = 'sdafsdf'; // $newStr = $this->modifyArray($str); $value = gmp_strval(gmp_init('234234234234',10),62); $newValue = gmp_strval(gmp_init($value,62),10); }

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