json_encode()
json_encode() encodes a data structure into a JSON string.
In case an error arise during parsing, a null value is returned, as the default value. This error may be confused with the decoding of the 'null' string, which is a valid JSON value. It may also raise a ValueError, when the function is configured by JSON_THROW_ON_ERROR.
<?php
$data = [1,2,3];
try {
$json = json_encode($data);
} catch(ValueError $e) {
print "JSON encoding error";
}
// $json === '[1,2,3]';
?>