How to Get a Hexadecimal Dump of a String in PHP?

Getting a Hexadecimal Dump of Strings in PHP

In PHP, strings represent sequences of characters. However, when dealing with encodings, it may be necessary to inspect the raw bytes that comprise a string. This article explores two methods for obtaining a hexadecimal dump of a string, providing a low-level representation of its binary content.

Method 1: Using bin2hex()

The bin2hex() function converts binary data (bytes) into its hexadecimal representation. To get a hex dump of a string, simply pass it as an argument to bin2hex(). For example:

$string = "Hello World";
$hexDump = bin2hex($string);
echo $hexDump;

This will output the following hexadecimal representation:

48656c6c6f20576f726c64

Method 2: Iterating over Characters

For greater control over the formatting, you can iterate over each character in the string and convert its ASCII value to hexadecimal. This can be done using the following code:

$string = "Hello World";
$hexDump = "";

for ($i = 0; $i < strlen($string); $i++) {
    $hexDump .= str_pad(dechex(ord($string[$i])), 2, '0', STR_PAD_LEFT);
}

echo $hexDump;

The output will be the same as in Method 1:

48656c6c6f20576f726c64

Both methods provide a hexadecimal representation of the bytes that comprise the string, which can be useful for debugging encoding issues or performing low-level string manipulation.

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