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<?php function isJson($string) { json_decode($string); return (json_last_error() == JSON_ERROR_NONE); } $a=['arraiii'=>['dentro'=>234]]; var_dump(isJson($a));
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
Fatal error: Uncaught TypeError: json_decode(): Argument #1 ($json) must be of type string, array given in /in/80SOE:6 Stack trace: #0 /in/80SOE(6): json_decode(Array) #1 /in/80SOE(14): isJson(Array) #2 {main} thrown in /in/80SOE on line 6
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: json_decode() expects parameter 1 to be string, array given in /in/80SOE on line 6 bool(true)
Output for 5.2.3 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/80SOE on line 12
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.2
<br /> <b>Parse error</b>: syntax error, unexpected '[' in <b>/in/80SOE</b> on line <b>12</b><br />
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, 5.0.0 - 5.0.5
<br /> <b>Parse error</b>: parse error, unexpected '[' in <b>/in/80SOE</b> on line <b>12</b><br />
Process exited with code 255.
Output for 4.3.2 - 4.3.4
<br /> <b>Parse error</b>: parse error in <b>/in/80SOE</b> on line <b>12</b><br />
Process exited with code 255.

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