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                ### 概述 在函數內部包含另一個函數 . ### 特點 * PHP嵌套函數最特別的是,當外部函數被調用時,內部函數就會自動進入全局域中,稱為新的定義函數 . #### 如果外部函數不進行調用的話, 直接調用內部函數會報錯 . ~~~ function out(){ echo "外部函數"; if(!function_exists('in')){ //不進行檢測會報錯重復定義 function in(){ echo '內部函數'; } } } out(); in(); ~~~ ~~~ 外部函數 內部函數 ~~~ #### 嵌套函數參數傳遞
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