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How to convert arrays to JSON in PHP?

The PHP function json_encode() returns a string containing the first parameter converted into JSON.

$myArray = array('one' => 1, 'two' => 2, 'three' => 3);
$json = json_encode($myArray);

// Expected output : "{"one":1,"two":2,"three":3}"
echo $json;

If the conversion failed, json_encode() returns false.