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run code in 150+ php & hhvm versions
Bugs & Features
<?php // Issue 1, empty associative arrays (dictionaries) become regular arrays. $dictionary = array('key' => 'value'); var_dump(json_encode($dictionary)); // gives '{"key":"value"}'; unset($dictionary['key']); var_dump(json_encode($dictionary)); // Gives '[]' -> json dictionary turned into array var_dump(json_encode((Object)$dictionary)); // Gives '{}' -> json dictionary stays dictionary // Issue 2, array manipulations that involve the array indexes, turn numeric arrays into dictionaries. $fruits = array("apples", "oranges"); var_dump(json_encode($fruits)); // Gives ["apples", "oranges"] unset($fruits[0]); // Don't like apples. var_dump(json_encode($fruits)); // Gives '{"1":"oranges"}' -> wow, array turned into dictionary.
Output for 5.2.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(15) "{"key":"value"}" string(2) "[]" string(2) "{}" string(20) "["apples","oranges"]" string(15) "{"1":"oranges"}"
Output for 5.0.0 - 5.0.5, 5.1.1 - 5.1.6
Fatal error: Call to undefined function json_encode() in /in/r1W6h on line 6
Process exited with code 255.
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/r1W6h on line 22
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_encode() in /in/r1W6h on line 6
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: json_encode() in /in/r1W6h on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_encode() in /in/r1W6h on line 6