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<?php // This converts correctly $arr = array( 0 => (object) array('id'=>1,'key'=>'value'), 1 => (object) array('id'=>2,'key'=>'value'), 2 => (object) array('id'=>3,'key'=>'value') ); var_dump(json_encode($arr)); // string(70) "[{"id":1,"key":"value"},{"id":2,"key":"value"},{"id":3,"key":"value"}]" // This does not, because the indexes don't start from 0 $arr = array( 1 => (object) array('id'=>1,'key'=>'value'), 2 => (object) array('id'=>2,'key'=>'value'), 3 => (object) array('id'=>3,'key'=>'value') ); var_dump(json_encode($arr)); // string(82) "{"1":{"id":1,"key":"value"},"2":{"id":2,"key":"value"},"3":{"id":3,"key":"value"}}" // Neither does this, because the indexes are not contiguous $arr = array( 0 => (object) array('id'=>1,'key'=>'value'), 1 => (object) array('id'=>2,'key'=>'value'), 3 => (object) array('id'=>3,'key'=>'value') ); var_dump(json_encode($arr)); // string(82) "{"0":{"id":1,"key":"value"},"1":{"id":2,"key":"value"},"3":{"id":3,"key":"value"}}" // But this does work. Apparently key type is not an issue. $arr = array( '0' => (object) array('id'=>1,'key'=>'value'), '1' => (object) array('id'=>2,'key'=>'value'), '2' => (object) array('id'=>3,'key'=>'value') ); var_dump(json_encode($arr)); // string(70) "[{"id":1,"key":"value"},{"id":2,"key":"value"},{"id":3,"key":"value"}]"
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