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| the number of significant digits displayed in floating point numbers. | |
| precision = 14|12 | |
| 当float超过14|12位时会自动用科学计数法表示，所以需要用$num = springf("%.0f", $number) | |
| microtime()=>return a string | |
| microtime(true)=>return a float | |
| echo sprintf("$.0f", $microtime() * 1000000) |
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