<?php
// Predict this output. I doubt you'll get it correct for any version of PHP you are working on.
var_dump( '9223372036854775807' == '9223372036854775808');
var_dump( '=' + '9223372036854775807' == '=' + '9223372036854775808');
var_dump( '=' . '9223372036854775807' == '=' . '9223372036854775808');
?>
bool(false)
Fatal error: Uncaught TypeError: Unsupported operand types: string + string in /in/bvfrH:7
Stack trace:
#0 {main}
thrown in /in/bvfrH on line 7
Process exited with code 255.
bool(false)
Warning: A non-numeric value encountered in /in/bvfrH on line 7
Warning: A non-numeric value encountered in /in/bvfrH on line 7
bool(true)
bool(false)