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<?php namespace Foo { function test1($input) { return strlen($input); } function test2($input) { return strlen($input); } var_dump(test1("test")); // int(4) // Simulate require eval('namespace Foo { function strlen($input) { return 42; }}'); var_dump(test2("test")); // int(42) var_dump(test1("test")); // int(4) }
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.1.0
int(4) int(42) int(4)
Output for 5.3.0 - 5.3.29, hhvm-3.12.0
int(4) int(42) int(42)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_STRING in /in/de9R0 on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING in /in/de9R0 on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/de9R0 on line 2
Process exited with code 255.