PHP convert string to hex and hex to string

Question

I got the problem when convert between this 2 type in PHP  This is the code I searched in google  function strToHex  string        hex         for   i 0   i  lt  strlen  string    i              hex    dechex ord  string  i               return  hex      function hexToStr  hex        string         for   i 0   i  lt  strlen  hex -1   i  2            string    chr hexdec  hex  i   hex  i 1               return  string      I check it and found out this when I use XOR to encrypt   I have the string  this is the test   after XOR with a key  I have the result in string      P   P    T      After that  I tried to convert it to hex by function strToHex   and I got these 12181d15501d15500e15541215712  Then  I tested with the function hexToStr   and I have      P   P   T   q  So  what should I do to solve this problem  Why does it wrong when I convert this 2 style value

User · Answer

You can try the following code to convert the image to hex string    lt  php  image    sample bmp    file   fopen  image   r   or die  Could not open  image    while   file  amp  amp   feof  file     chunk   fread  file  1000000     You can affect performance altering this number  YMMV    This loop will be dog-slow  almost for sure      You could snag two or three bytes and shift add them    but at 4 bytes  you violate the 7fffffff limit of dechex      You could maybe write a better dechex that would accept multiple bytes   and use substr    Maybe  for   byte   0   byte  lt  strlen  chunk    byte      echo dechex ord  chunk  byte           gt

User · Answer

Here s what I use   function strhex  string       hexstr   unpack  H     string     return array shift  hexstr

User · Answer

Using  bill-shirley answer with a little addition  function str to hex  string     hexstr   unpack  H     string   return array shift  hexstr     function hex to str  string    return hex2bin   string        Usage      str    Go placidly amidst the noise      hexstr   str to hex  str     476f20706c616369646c7920616d6964737420746865206e6f697365    strstr   hex to str  str     Go placidly amidst the noise

User · Answer

PHP    string to hex   implode unpack  H     string      hex to string   pack  H     hex

User · Answer

I only have half the answer  but I hope that it is useful as it adds unicode  utf-8  support    decimal to unicode character function unichr  dec       if   dec  lt  128          utf   chr  dec        else if   dec  lt  2048          utf   chr 192      dec -   dec   64     64          utf    chr 128     dec   64         else         utf   chr 224      dec -   dec   4096     4096          utf    chr 128       dec   4096  -   dec   64     64          utf    chr 128     dec   64            return  utf      To string  var dump unichr hexdec  e641        Source  http   www php net manual en function chr php Hcom55978

User · Answer

For people that end up here and are just looking for the hex representation of a  binary  string  bin2hex  quot that s all you need quot      74686174277320616c6c20796f75206e656564  hex2bin  74686174277320616c6c20796f75206e656564      that s all you need  Doc  bin2hex  hex2bin

User · Answer

function hexToStr  hex          Remove spaces if the hex string has spaces      hex   str replace           hex       return hex2bin  hex        Test it   hex       53 44 43 30 30 32 30 30 30 31 37 33   echo hexToStr  hex      SDC002000173         Test Hex To string with PHP UNIT     param  string  value     return      public function testHexToString          string    SDC002000173        hex       53 44 43 30 30 32 30 30 30 31 37 33        result   hexToStr  hex         this- gt assertEquals  result  string

User · Answer

For any char with ord  char   lt  16 you get a HEX back which is only 1 long  You forgot to add 0 padding   This should solve it    lt  php function strToHex  string        hex           for   i 0   i lt strlen  string    i              ord   ord  string  i             hexCode   dechex  ord            hex    substr  0   hexCode  -2             return strToUpper  hex     function hexToStr  hex        string         for   i 0   i  lt  strlen  hex -1   i  2            string    chr hexdec  hex  i   hex  i 1               return  string         Tests header  Content-Type  text plain    function test  expected   actual   success        if  expected      actual            echo  Expected    expected  n           echo  Actual      actual  n           echo   n            success   false            return  success      success   true   success   test  00   strToHex hexToStr  00      success    success   test  FF   strToHex hexToStr  FF      success    success   test  000102FF   strToHex hexToStr  000102FF      success    success   test       P   P    T       hexToStr strToHex       P   P    T          success    echo  success    Success      nFailed

[php] PHP convert string to hex and hex to string

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