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What is this format called that has similarities to JSON? It represents an PHP object, just like JSON would be able to do. However, clearly this is not JSON.

O:36:\"Symfony\\Component\\Messenger\\Envelope\":2:{s:44: ..... ;s:4:\"null\";}}

O:36 probably stands for Object and 36 properties (?)

s:4 seems to stand for string and 4 characters.

What is this syntax / format called?

WebDevPassion
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    [PHP serialization format](https://en.wikipedia.org/wiki/PHP_serialization_format) – jhnc Jan 16 '23 at 18:35
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    Though with the slashes, it looks like it's been run through the json_encode after the serialization – aynber Jan 16 '23 at 18:41

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