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                use是配合匿名函數去進行使用的。作用是給匿名函數引入一個和匿名函數處于同一作用域的變量。 use默認情況下引入變量是一個拷貝傳值的關系,所以改變匿名函數內部引入變量的值,外部的變量不會發生變化,如果想通過改變匿名函數引入的變量來修改外部變量值的話,那么在use后面的變量名前加上一個&。 ![Image](https://box.kancloud.cn/558e0163bdb982792cfdd617393e2c4e_768x298.png) ![Image](https://box.kancloud.cn/2e9cf607c0118cfe127d17116a11b9c3_847x195.png) // 定義一個函數,功能是連續創建三個超全局的匿名函數 function fn(){ for($i=1;$i<=3;$i++){ $GLOBALS\['fn\_'.$i\]=function()use(&$i){ echo $i; }; } } fn(); $fn\_1(); $fn\_2(); $fn\_3(); //444 //如果不加&是1 2 3
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