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<?php function test() { yield from $a; } foreach (test() as $val) { echo $val; }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Undefined variable $a in /in/9ri2a on line 5 Fatal error: Uncaught Error: Can use "yield from" only with arrays and Traversables in /in/9ri2a:5 Stack trace: #0 /in/9ri2a(8): test() #1 {main} thrown in /in/9ri2a on line 5
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: a in /in/9ri2a on line 5 Fatal error: Uncaught Error: Can use "yield from" only with arrays and Traversables in /in/9ri2a:5 Stack trace: #0 /in/9ri2a(8): test() #1 {main} thrown in /in/9ri2a on line 5
Process exited with code 255.
Output for 7.3.32 - 7.3.33
Fatal error: Uncaught Error: Can use "yield from" only with arrays and Traversables in /in/9ri2a:5 Stack trace: #0 /in/9ri2a(8): test() #1 {main} thrown in /in/9ri2a on line 5
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected '$a' (T_VARIABLE) in /in/9ri2a on line 5
Process exited with code 255.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected 'from' (T_STRING) in /in/9ri2a on line 5
Process exited with code 255.

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