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run code in 150+ php & hhvm versions
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<?php var_dump( '{!' . (string)2 + 1 . '}' ); // The "." and "+" have the same precedence, so how operations are grouped // comes down to their associativity. Left associativity means the operations // were grouped like: var_dump( (('{!' . (string)2) + 1) . '}' );
Output for 7.1.0
Warning: A non-numeric value encountered in /in/i2HUO on line 3 string(2) "1}" Warning: A non-numeric value encountered in /in/i2HUO on line 8 string(2) "1}"
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.0.14
string(2) "1}" string(2) "1}"
Output for hhvm-3.10.0

Process exited with code 153.