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<?php class BadIterator implements Iterator { private $data = [1, 2, 3, 4, 5]; private $pos = 0; public function current() { return $this; } public function key() { return $this->pos; } public function next() { $this->pos++; } public function rewind() { $this->pos = 0; } public function valid() { return $this->pos < count($this->data); } public function __toString() { return (string) $this->data[$this->pos]; } } echo "Direct iteration:\n"; foreach (new BadIterator as $val) { echo "$val\n"; } echo "Caching iteration:\n"; foreach (new CachingIterator(new BadIterator) as $val) { echo "$val\n"; }
Output for 8.0.0beta1
Direct iteration: 1 2 3 4 5 Caching iteration: 2 3 4 5 Warning: Undefined array key 5 in /in/dUgEg on line 35
Output for 8.0.0alpha3
Direct iteration: 1 2 3 4 5 Caching iteration: 2 3 4 5 Notice: Undefined array key 5 in /in/dUgEg on line 35
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30, 7.0.0 - 7.0.31, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.21, 7.4.0 - 7.4.9, 8.0.0alpha1 - alpha2
Direct iteration: 1 2 3 4 5 Caching iteration: 2 3 4 5 Notice: Undefined offset: 5 in /in/dUgEg on line 35
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/dUgEg on line 5
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/dUgEg on line 5
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/dUgEg 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
Parse error: parse error, unexpected T_STRING, expecting '{' in /in/dUgEg on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/dUgEg on line 3
Process exited with code 255.