- json_decode: documentation ( source)
- print_r: documentation ( source)
- array_values: documentation ( source)
- array_keys: documentation ( source)
<?php
$X = '{"a":"a","b":"b","c":"c","d":"d","e":"e","f":"f9","g":"g2","h":"h1"}';
print_r((fn()=>array_keys(json_decode($X,1)))());
print_r((fn()=>array_values(json_decode($X,1)))());