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<?php $a = "1234567890"; var_dump(isset($a[010])); // true var_dump(isset($a["010"])); // false; 10進数の10として認識されている var_dump($a["0x1"]); $a .= "a"; var_dump(isset($a["010"])); // true
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
bool(true) bool(false) Warning: Illegal string offset "0x1" in /in/PQ4Q1 on line 6 string(1) "1" bool(true)
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.33
bool(true) bool(false) Notice: A non well formed numeric value encountered in /in/PQ4Q1 on line 6 string(1) "1" bool(true)
Output for 4.3.3 - 4.3.11, 4.4.0 - 4.4.9, 5.0.3 - 5.0.5, 5.1.1 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.3.32 - 7.3.33
bool(true) bool(false) string(1) "1" bool(true)
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/PQ4Q1 on line 9
Process exited with code 255.
Output for 5.0.0 - 5.0.2
bool(true) bool(false) string(1) "1" bool(false)
Output for 4.3.0 - 4.3.2
bool(true) Notice: Uninitialized string offset: 10 in /in/PQ4Q1 on line 5 bool(false) string(1) "1" bool(true)

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256.94 ms | 401 KiB | 355 Q