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                **一.適用函數** ``` 1.printf 2.sprintf ``` &emsp; **二.舊版本用法** ``` printf('%d',3.1415926); printf('%.2f',3.1415926); printf('%5.2f',3.1415926); printf('%s','abcdefghijklmn'); printf('%.2s','abcdefghijklmn'); printf('%5.2s','abcdefghijklmn'); ``` #使用參數 ``` printf("%.{$p}f",3.1415926); printf("%{$w}.{$p}f",3.1415926); ``` &emsp; **三.新版本用法** #使用參數更為方便 ``` printf("%.*f",2,3.1415926); printf("%*.*f",5,2,3.1415926); ``` &emsp; **四.位置參數** ``` printf("%1$.*2$f",3.1415926,2); ``` #1$為第一個參數3.1415926值,2$為第二個參數2,這種情況下無法使用width寬度,只能是值與精度. #字符串也是一樣的用法. &emsp; **配套的PHP8新特性詳解視頻教程,請查看以下專輯** 鏈接:[https://www.ixigua.com/6937490165329822219](https://www.ixigua.com/6937490165329822219)
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