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<?php $json = '{"1":"1", "":123}'; var_dump( json_decode( $json ) );
Output for 7.1.0
object(stdClass)#1 (2) { ["1"]=> string(1) "1" [""]=> int(123) }
Output for 5.2.0 - 7.0.14
object(stdClass)#1 (2) { ["1"]=> string(1) "1" ["_empty_"]=> int(123) }
Output for 5.0.0 - 5.1.6
<br /> <b>Fatal error</b>: Call to undefined function json_decode() in <b>/in/HKGjt</b> on line <b>3</b><br />
Process exited with code 255.
Output for 4.4.5 - 4.4.9
<br /> <b>Fatal error</b>: Call to undefined function: json_decode() in <b>/in/HKGjt</b> on line <b>3</b><br />
Process exited with code 255.
Output for 4.3.2 - 4.4.4
<br /> <b>Fatal error</b>: Call to undefined function: json_decode() in <b>/in/HKGjt</b> on line <b>3</b><br />
Process exited with code 255.
Output for 4.3.0 - 4.3.1
<br /> <b>Fatal error</b>: Call to undefined function: json_decode() in <b>/in/HKGjt</b> on line <b>3</b><br />