Description:
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In PHP versions 5.3.19 - 5.6.15, a parse error in create_function returns false, per the manual:

> If there is a parse error in the evaluated code, eval() returns FALSE and 
> execution of the following code continues normally.

As of PHP 7, this outputs only a parse error and terminates the script.

See https://3v4l.org/apEOR#v5319

Test script:
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<?php

$a = create_function('', 'return (return;);');
var_dump($a, 'here');

Expected result:
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Parse error: syntax error, unexpected 'return' (T_RETURN) in %s : runtime-created function on line %d
bool(false)
string(4) "here"

Actual result:
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Parse error: syntax error, unexpected 'return' (T_RETURN) in %s : runtime-created function on line %d