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swoole_atomic->add

增加计数

function swoole_atomic->add(int $add_value = 1)

$add_value要增加的数值，默认为1
$add_value必须为正整数
$add_value与原值相加如果超过42亿，将会溢出，高位数值会被丢弃
add方法操作成功后返回结果数值