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[PHP] String conversion to integer


I'm testing php 7.1 in my project, and I got a strange problem.

$string = '584e82ed00819';
echo (int)$string;

The above code will output 9223372036854775807 (It's PHP_INT_MAX) in php
In php 5.5, the result is: 584.

According to the document:

I guess php 7.1 process the string as 584e82, but 5.5 did not.

Any differences for string conversion between 7.1 and 5.5 ?