Hi, 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 7.1. In php 5.5, the result is: 584. According to the document: http://php.net/manual/en/language.types.string.php#language.types.string.conversion 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 ?