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@ 2015-04-14T03:45:03Z

<?php
$arr = array(
    '4' => 1,
    '3' => 2,
    '2' => '3',
    '1' => '4',
    );
    
$str = json_encode($arr);

Output
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References
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json_encode: documentation ( source)

preferences:dark modelive preview

45.71 ms | 402 KiB | 5 Q