Question

How to use pack() function to pack arguments into a binary string according to format in PHP

Answer 1

echo pack("H*", 616263) . "<br />";

   
/*
run: 

abc

*/

 

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Answer 2

$s = bin2hex('Herbert Hoover');
echo $s . "<br />";
echo pack("H*", $s) . "<br />";

   
/*
run: 

4865726265727420486f6f766572
Herbert Hoover

*/

 

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