<?php
var_dump(
bin2hex(pack("LLZ*", 12345, 67890, "bark bark I am a chicken")),
unpack("Lone/Ltwo/Z*three", hex2bin("39300000320901006261726b206261726b204920616d206120636869636b656e00"))
);
string(66) "39300000320901006261726b206261726b204920616d206120636869636b656e00"
array(3) {
["one"]=>
int(12345)
["two"]=>
int(67890)
["three"]=>
string(24) "bark bark I am a chicken"
}
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
string(66) "39300000320901006261726b206261726b204920616d206120636869636b656e00"
array(3) {
["one"]=>
int(12345)
["two"]=>
int(67890)
["three"]=>
string(24) "bark bark I am a chicken"
}