How to implement the logic of Java signature string generation using PHP?

PHP implementation of Java signature string generation code

This article will explore how to rewrite a Java code snippet to a PHP version for generating a signature string. The original Java code uses specific character encoding and byte operations, which requires corresponding processing in PHP.

The core logic of the original Java code is: first splice multiple parameters into a string, and then convert it into a byte array using "iso-8859-1" encoding. Next, the byte array is shifted, the original byte array and the shifted byte number are combined, and the final signature string is generated using the MD5 algorithm.

In order to implement the same functionality in PHP, we need to carefully consider the corresponding implementations of getBytes("iso-8859-1"), change and mergeByte methods used in Java code.

In PHP code, the getEncryptStr function corresponds to the getEncryptStr method in Java code. It receives the same parameters as Java methods: uuid, app_key, app_secret, time_millis, move_card. The string splicing part is the same as the Java code. The key is to deal with character encoding. Since PHP uses UTF-8 encoding by default, we need to use the utf8_decode function to decode the UTF-8 string to ISO-8859-1 to simulate the behavior of Java code. This part is reflected in the PHP code as $encrypt_byte = utf8_decode($encrypt_str);.

The change function corresponds to the change method in Java code. This function implements shift operations of byte arrays. The implementation in PHP code directly operates strings and uses the index of strings to simulate byte operations. It should be noted that the index of PHP strings starts at 0, which is consistent with the array index in Java code.

The merge_byte function corresponds to the mergeByte method in Java code. This function combines two strings into a new string. PHP code uses string splicing to implement it.

In short, PHP code simulates character encoding conversion in Java code through the utf8_decode function, and uses string operations to simulate byte array operations, ultimately implementing the same signature string generation logic as Java code. Although PHP's string operation method is different from Java's byte array operation method, through clever conversion, the same functional effect is finally achieved.

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