3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = array( "key1"=>"value1", "key2"=>null, "key3"=>array( "subkey1"=>null, "subkey2"=>"subvalue2"), "key4"=>null); echo json_encode(replace_null_with_empty_string($arr)); function replace_null_with_empty_string($array) { foreach ($array as $key => $value) { if(is_array($value)) $array[$key] = replace_null_with_empty_string($value); else { if (is_null($value)) $array[$key] = ""; } } return $array; }
Output for 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 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.13
{"key1":"value1","key2":"","key3":{"subkey1":"","subkey2":"subvalue2"},"key4":""}
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Fatal error: Call to undefined function json_encode() in /in/7uXTL on line 10
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_encode() in /in/7uXTL on line 10
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4
Fatal error: Call to undefined function: json_encode() in /in/7uXTL on line 10
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_encode() in /in/7uXTL on line 10
preferences:
89.38 ms | 409 KiB | 5 Q