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<?php namespace GeneratorExample; class Pipeline { protected $generators = []; function __construct() { } function add(callable $generator) { $this->generators[] = $generator; return $this; } function resolve() { $inputs = func_get_args(); foreach (array_reverse($this->generators) as $g) { $generator = call_user_func_array($g, $inputs); $inputs = [$generator]; } return $generator; } } function uppercase(\Traversable $in) { foreach ($in as $word) { yield strtoupper($word); } } function reverse(\Traversable $in) { foreach ($in as $word) { yield strrev($word); } } function each_println(\Traversable $in) { foreach ($in as $line) { echo "$line\n"; } } $words = new \ArrayIterator(["foo", "bar", "baz"]); $p = new Pipeline; $p->add("GeneratorExample\\uppercase")->add("GeneratorExample\\reverse")->add("GeneratorExample\\each_println"); $p->resolve($words);
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
foo bar baz Fatal error: Uncaught TypeError: GeneratorExample\reverse(): Argument #1 ($in) must be of type Traversable, null given in /in/SmH2d:39 Stack trace: #0 [internal function]: GeneratorExample\reverse(NULL) #1 /in/SmH2d(24): call_user_func_array('GeneratorExampl...', Array) #2 /in/SmH2d(57): GeneratorExample\Pipeline->resolve(Object(ArrayIterator)) #3 {main} thrown in /in/SmH2d on line 39
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
foo bar baz Fatal error: Uncaught TypeError: Argument 1 passed to GeneratorExample\reverse() must implement interface Traversable, null given in /in/SmH2d:39 Stack trace: #0 [internal function]: GeneratorExample\reverse(NULL) #1 /in/SmH2d(24): call_user_func_array('GeneratorExampl...', Array) #2 /in/SmH2d(57): GeneratorExample\Pipeline->resolve(Object(ArrayIterator)) #3 {main} thrown in /in/SmH2d on line 39
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33
foo bar baz
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected 'strtoupper' (T_STRING) in /in/SmH2d on line 35
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/SmH2d on line 7
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_STRING in /in/SmH2d on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING in /in/SmH2d on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/SmH2d on line 3
Process exited with code 255.
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