Why Do My PHP String to Hex and Hex to String Conversions Produce Incorrect Results?

PHP String to Hex and Hex to String Conversion

In PHP, converting between strings and hexadecimal representations can be achieved using two functions: strToHex() and hexToStr(). However, a common challenge arises when utilizing XOR for encryption, where the converted hex values produce incorrect results.

Issue: Inconsistencies in Hex and String Conversion

When using the provided strToHex() and hexToStr() functions to convert between a binary string ("this is the test") and its hexadecimal representation (12181d15501d15500e15541215712), the resulting decoded string ("↕↑↔§P↔§P♫§T↕§q") differs from the original.

Solution: Using Built-in PHP Functions

For a hassle-free alternative, PHP offers built-in functions for converting between binary strings and hexadecimal representations:

• bin2hex() converts a binary string to its hexadecimal representation.
• hex2bin() converts a hexadecimal string to its binary representation.

Example usage:

$binaryString = "that's all you need";
$hexRepresentation = bin2hex($binaryString); // Result: 74686174277320616c6c20796f75206e656564

$decodedBinaryString = hex2bin($hexRepresentation); // Result: that's all you need

These built-in functions provide reliable and accurate conversions, eliminating the inconsistencies encountered when using custom functions.

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